mirror of https://github.com/python/cpython
2206 lines
76 KiB
Python
2206 lines
76 KiB
Python
"""
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Tests for the threading module.
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"""
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import test.support
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from test.support import threading_helper, requires_subprocess, requires_gil_enabled
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from test.support import verbose, cpython_only, os_helper
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from test.support.import_helper import import_module
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from test.support.script_helper import assert_python_ok, assert_python_failure
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from test.support import force_not_colorized
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import random
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import sys
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import _thread
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import threading
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import time
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import unittest
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import weakref
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import os
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import subprocess
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import signal
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import textwrap
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import traceback
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import warnings
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from unittest import mock
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from test import lock_tests
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from test import support
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try:
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from test.support import interpreters
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except ImportError:
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interpreters = None
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threading_helper.requires_working_threading(module=True)
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# Between fork() and exec(), only async-safe functions are allowed (issues
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# #12316 and #11870), and fork() from a worker thread is known to trigger
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# problems with some operating systems (issue #3863): skip problematic tests
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# on platforms known to behave badly.
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platforms_to_skip = ('netbsd5', 'hp-ux11')
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def skip_unless_reliable_fork(test):
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if not support.has_fork_support:
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return unittest.skip("requires working os.fork()")(test)
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if sys.platform in platforms_to_skip:
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return unittest.skip("due to known OS bug related to thread+fork")(test)
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if support.HAVE_ASAN_FORK_BUG:
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return unittest.skip("libasan has a pthread_create() dead lock related to thread+fork")(test)
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if support.check_sanitizer(thread=True):
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return unittest.skip("TSAN doesn't support threads after fork")(test)
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return test
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def requires_subinterpreters(meth):
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"""Decorator to skip a test if subinterpreters are not supported."""
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return unittest.skipIf(interpreters is None,
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'subinterpreters required')(meth)
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def restore_default_excepthook(testcase):
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testcase.addCleanup(setattr, threading, 'excepthook', threading.excepthook)
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threading.excepthook = threading.__excepthook__
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# A trivial mutable counter.
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class Counter(object):
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def __init__(self):
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self.value = 0
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def inc(self):
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self.value += 1
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def dec(self):
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self.value -= 1
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def get(self):
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return self.value
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class TestThread(threading.Thread):
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def __init__(self, name, testcase, sema, mutex, nrunning):
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threading.Thread.__init__(self, name=name)
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self.testcase = testcase
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self.sema = sema
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self.mutex = mutex
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self.nrunning = nrunning
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def run(self):
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delay = random.random() / 10000.0
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if verbose:
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print('task %s will run for %.1f usec' %
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(self.name, delay * 1e6))
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with self.sema:
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with self.mutex:
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self.nrunning.inc()
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if verbose:
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print(self.nrunning.get(), 'tasks are running')
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self.testcase.assertLessEqual(self.nrunning.get(), 3)
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time.sleep(delay)
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if verbose:
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print('task', self.name, 'done')
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with self.mutex:
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self.nrunning.dec()
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self.testcase.assertGreaterEqual(self.nrunning.get(), 0)
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if verbose:
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print('%s is finished. %d tasks are running' %
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(self.name, self.nrunning.get()))
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class BaseTestCase(unittest.TestCase):
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def setUp(self):
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self._threads = threading_helper.threading_setup()
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def tearDown(self):
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threading_helper.threading_cleanup(*self._threads)
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test.support.reap_children()
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class ThreadTests(BaseTestCase):
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maxDiff = 9999
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@cpython_only
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def test_name(self):
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def func(): pass
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thread = threading.Thread(name="myname1")
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self.assertEqual(thread.name, "myname1")
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# Convert int name to str
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thread = threading.Thread(name=123)
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self.assertEqual(thread.name, "123")
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# target name is ignored if name is specified
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thread = threading.Thread(target=func, name="myname2")
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self.assertEqual(thread.name, "myname2")
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with mock.patch.object(threading, '_counter', return_value=2):
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thread = threading.Thread(name="")
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self.assertEqual(thread.name, "Thread-2")
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with mock.patch.object(threading, '_counter', return_value=3):
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thread = threading.Thread()
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self.assertEqual(thread.name, "Thread-3")
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with mock.patch.object(threading, '_counter', return_value=5):
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thread = threading.Thread(target=func)
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self.assertEqual(thread.name, "Thread-5 (func)")
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def test_args_argument(self):
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# bpo-45735: Using list or tuple as *args* in constructor could
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# achieve the same effect.
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num_list = [1]
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num_tuple = (1,)
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str_list = ["str"]
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str_tuple = ("str",)
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list_in_tuple = ([1],)
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tuple_in_list = [(1,)]
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test_cases = (
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(num_list, lambda arg: self.assertEqual(arg, 1)),
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(num_tuple, lambda arg: self.assertEqual(arg, 1)),
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(str_list, lambda arg: self.assertEqual(arg, "str")),
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(str_tuple, lambda arg: self.assertEqual(arg, "str")),
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(list_in_tuple, lambda arg: self.assertEqual(arg, [1])),
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(tuple_in_list, lambda arg: self.assertEqual(arg, (1,)))
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)
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for args, target in test_cases:
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with self.subTest(target=target, args=args):
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t = threading.Thread(target=target, args=args)
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t.start()
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t.join()
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def test_lock_no_args(self):
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threading.Lock() # works
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self.assertRaises(TypeError, threading.Lock, 1)
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self.assertRaises(TypeError, threading.Lock, a=1)
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self.assertRaises(TypeError, threading.Lock, 1, 2, a=1, b=2)
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def test_lock_no_subclass(self):
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# Intentionally disallow subclasses of threading.Lock because they have
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# never been allowed, so why start now just because the type is public?
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with self.assertRaises(TypeError):
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class MyLock(threading.Lock): pass
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def test_lock_or_none(self):
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import types
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self.assertIsInstance(threading.Lock | None, types.UnionType)
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# Create a bunch of threads, let each do some work, wait until all are
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# done.
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def test_various_ops(self):
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# This takes about n/3 seconds to run (about n/3 clumps of tasks,
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# times about 1 second per clump).
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NUMTASKS = 10
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# no more than 3 of the 10 can run at once
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sema = threading.BoundedSemaphore(value=3)
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mutex = threading.RLock()
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numrunning = Counter()
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threads = []
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for i in range(NUMTASKS):
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t = TestThread("<thread %d>"%i, self, sema, mutex, numrunning)
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threads.append(t)
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self.assertIsNone(t.ident)
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self.assertRegex(repr(t), r'^<TestThread\(.*, initial\)>$')
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t.start()
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if hasattr(threading, 'get_native_id'):
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native_ids = set(t.native_id for t in threads) | {threading.get_native_id()}
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self.assertNotIn(None, native_ids)
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self.assertEqual(len(native_ids), NUMTASKS + 1)
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if verbose:
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print('waiting for all tasks to complete')
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for t in threads:
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t.join()
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self.assertFalse(t.is_alive())
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self.assertNotEqual(t.ident, 0)
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self.assertIsNotNone(t.ident)
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self.assertRegex(repr(t), r'^<TestThread\(.*, stopped -?\d+\)>$')
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if verbose:
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print('all tasks done')
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self.assertEqual(numrunning.get(), 0)
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def test_ident_of_no_threading_threads(self):
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# The ident still must work for the main thread and dummy threads.
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self.assertIsNotNone(threading.current_thread().ident)
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def f():
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ident.append(threading.current_thread().ident)
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done.set()
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done = threading.Event()
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ident = []
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with threading_helper.wait_threads_exit():
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tid = _thread.start_new_thread(f, ())
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done.wait()
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self.assertEqual(ident[0], tid)
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# run with a small(ish) thread stack size (256 KiB)
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def test_various_ops_small_stack(self):
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if verbose:
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print('with 256 KiB thread stack size...')
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try:
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threading.stack_size(262144)
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except _thread.error:
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raise unittest.SkipTest(
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'platform does not support changing thread stack size')
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self.test_various_ops()
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threading.stack_size(0)
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# run with a large thread stack size (1 MiB)
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def test_various_ops_large_stack(self):
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if verbose:
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print('with 1 MiB thread stack size...')
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try:
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threading.stack_size(0x100000)
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except _thread.error:
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raise unittest.SkipTest(
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'platform does not support changing thread stack size')
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self.test_various_ops()
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threading.stack_size(0)
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def test_foreign_thread(self):
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# Check that a "foreign" thread can use the threading module.
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dummy_thread = None
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error = None
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def f(mutex):
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try:
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nonlocal dummy_thread
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nonlocal error
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# Calling current_thread() forces an entry for the foreign
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# thread to get made in the threading._active map.
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dummy_thread = threading.current_thread()
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tid = dummy_thread.ident
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self.assertIn(tid, threading._active)
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self.assertIsInstance(dummy_thread, threading._DummyThread)
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self.assertIs(threading._active.get(tid), dummy_thread)
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# gh-29376
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self.assertTrue(
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dummy_thread.is_alive(),
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'Expected _DummyThread to be considered alive.'
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)
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self.assertIn('_DummyThread', repr(dummy_thread))
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except BaseException as e:
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error = e
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finally:
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mutex.release()
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mutex = threading.Lock()
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mutex.acquire()
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with threading_helper.wait_threads_exit():
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tid = _thread.start_new_thread(f, (mutex,))
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# Wait for the thread to finish.
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mutex.acquire()
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if error is not None:
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raise error
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self.assertEqual(tid, dummy_thread.ident)
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# Issue gh-106236:
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with self.assertRaises(RuntimeError):
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dummy_thread.join()
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dummy_thread._started.clear()
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with self.assertRaises(RuntimeError):
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dummy_thread.is_alive()
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# Busy wait for the following condition: after the thread dies, the
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# related dummy thread must be removed from threading._active.
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timeout = 5
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timeout_at = time.monotonic() + timeout
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while time.monotonic() < timeout_at:
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if threading._active.get(dummy_thread.ident) is not dummy_thread:
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break
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time.sleep(.1)
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else:
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self.fail('It was expected that the created threading._DummyThread was removed from threading._active.')
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# PyThreadState_SetAsyncExc() is a CPython-only gimmick, not (currently)
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# exposed at the Python level. This test relies on ctypes to get at it.
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def test_PyThreadState_SetAsyncExc(self):
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ctypes = import_module("ctypes")
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set_async_exc = ctypes.pythonapi.PyThreadState_SetAsyncExc
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set_async_exc.argtypes = (ctypes.c_ulong, ctypes.py_object)
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class AsyncExc(Exception):
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pass
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exception = ctypes.py_object(AsyncExc)
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# First check it works when setting the exception from the same thread.
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tid = threading.get_ident()
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self.assertIsInstance(tid, int)
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self.assertGreater(tid, 0)
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try:
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result = set_async_exc(tid, exception)
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# The exception is async, so we might have to keep the VM busy until
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# it notices.
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while True:
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pass
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except AsyncExc:
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pass
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else:
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# This code is unreachable but it reflects the intent. If we wanted
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# to be smarter the above loop wouldn't be infinite.
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self.fail("AsyncExc not raised")
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try:
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self.assertEqual(result, 1) # one thread state modified
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except UnboundLocalError:
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# The exception was raised too quickly for us to get the result.
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pass
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# `worker_started` is set by the thread when it's inside a try/except
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# block waiting to catch the asynchronously set AsyncExc exception.
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# `worker_saw_exception` is set by the thread upon catching that
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# exception.
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worker_started = threading.Event()
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worker_saw_exception = threading.Event()
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class Worker(threading.Thread):
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def run(self):
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self.id = threading.get_ident()
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self.finished = False
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try:
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while True:
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worker_started.set()
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time.sleep(0.1)
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except AsyncExc:
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self.finished = True
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worker_saw_exception.set()
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t = Worker()
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t.daemon = True # so if this fails, we don't hang Python at shutdown
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t.start()
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if verbose:
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print(" started worker thread")
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# Try a thread id that doesn't make sense.
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if verbose:
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print(" trying nonsensical thread id")
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result = set_async_exc(-1, exception)
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self.assertEqual(result, 0) # no thread states modified
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# Now raise an exception in the worker thread.
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if verbose:
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print(" waiting for worker thread to get started")
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ret = worker_started.wait()
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self.assertTrue(ret)
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if verbose:
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print(" verifying worker hasn't exited")
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self.assertFalse(t.finished)
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if verbose:
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print(" attempting to raise asynch exception in worker")
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result = set_async_exc(t.id, exception)
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self.assertEqual(result, 1) # one thread state modified
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if verbose:
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print(" waiting for worker to say it caught the exception")
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worker_saw_exception.wait(timeout=support.SHORT_TIMEOUT)
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self.assertTrue(t.finished)
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if verbose:
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print(" all OK -- joining worker")
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if t.finished:
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t.join()
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# else the thread is still running, and we have no way to kill it
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def test_limbo_cleanup(self):
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# Issue 7481: Failure to start thread should cleanup the limbo map.
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def fail_new_thread(*args, **kwargs):
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raise threading.ThreadError()
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_start_joinable_thread = threading._start_joinable_thread
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threading._start_joinable_thread = fail_new_thread
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try:
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t = threading.Thread(target=lambda: None)
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self.assertRaises(threading.ThreadError, t.start)
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self.assertFalse(
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t in threading._limbo,
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"Failed to cleanup _limbo map on failure of Thread.start().")
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finally:
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threading._start_joinable_thread = _start_joinable_thread
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def test_finalize_running_thread(self):
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# Issue 1402: the PyGILState_Ensure / _Release functions may be called
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# very late on python exit: on deallocation of a running thread for
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# example.
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if support.check_sanitizer(thread=True):
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# the thread running `time.sleep(100)` below will still be alive
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# at process exit
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self.skipTest("TSAN would report thread leak")
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import_module("ctypes")
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rc, out, err = assert_python_failure("-c", """if 1:
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import ctypes, sys, time, _thread
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# This lock is used as a simple event variable.
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ready = _thread.allocate_lock()
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ready.acquire()
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# Module globals are cleared before __del__ is run
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# So we save the functions in class dict
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class C:
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ensure = ctypes.pythonapi.PyGILState_Ensure
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release = ctypes.pythonapi.PyGILState_Release
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def __del__(self):
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state = self.ensure()
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self.release(state)
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def waitingThread():
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x = C()
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ready.release()
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time.sleep(100)
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_thread.start_new_thread(waitingThread, ())
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ready.acquire() # Be sure the other thread is waiting.
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sys.exit(42)
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""")
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self.assertEqual(rc, 42)
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def test_finalize_with_trace(self):
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# Issue1733757
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# Avoid a deadlock when sys.settrace steps into threading._shutdown
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if support.check_sanitizer(thread=True):
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# the thread running `time.sleep(2)` below will still be alive
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# at process exit
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self.skipTest("TSAN would report thread leak")
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|
assert_python_ok("-c", """if 1:
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import sys, threading
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|
# A deadlock-killer, to prevent the
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# testsuite to hang forever
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|
def killer():
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import os, time
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time.sleep(2)
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print('program blocked; aborting')
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os._exit(2)
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t = threading.Thread(target=killer)
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t.daemon = True
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t.start()
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# This is the trace function
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def func(frame, event, arg):
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threading.current_thread()
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return func
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sys.settrace(func)
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|
""")
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|
def test_join_nondaemon_on_shutdown(self):
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|
# Issue 1722344
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|
# Raising SystemExit skipped threading._shutdown
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|
rc, out, err = assert_python_ok("-c", """if 1:
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import threading
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|
from time import sleep
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|
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|
def child():
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sleep(1)
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# As a non-daemon thread we SHOULD wake up and nothing
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# should be torn down yet
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print("Woke up, sleep function is:", sleep)
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threading.Thread(target=child).start()
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raise SystemExit
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|
""")
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self.assertEqual(out.strip(),
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b"Woke up, sleep function is: <built-in function sleep>")
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|
self.assertEqual(err, b"")
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|
def test_enumerate_after_join(self):
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|
# Try hard to trigger #1703448: a thread is still returned in
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|
# threading.enumerate() after it has been join()ed.
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|
enum = threading.enumerate
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|
old_interval = sys.getswitchinterval()
|
|
try:
|
|
for i in range(1, 100):
|
|
support.setswitchinterval(i * 0.0002)
|
|
t = threading.Thread(target=lambda: None)
|
|
t.start()
|
|
t.join()
|
|
l = enum()
|
|
self.assertNotIn(t, l,
|
|
"#1703448 triggered after %d trials: %s" % (i, l))
|
|
finally:
|
|
sys.setswitchinterval(old_interval)
|
|
|
|
def test_join_from_multiple_threads(self):
|
|
# Thread.join() should be thread-safe
|
|
errors = []
|
|
|
|
def worker():
|
|
time.sleep(0.005)
|
|
|
|
def joiner(thread):
|
|
try:
|
|
thread.join()
|
|
except Exception as e:
|
|
errors.append(e)
|
|
|
|
for N in range(2, 20):
|
|
threads = [threading.Thread(target=worker)]
|
|
for i in range(N):
|
|
threads.append(threading.Thread(target=joiner,
|
|
args=(threads[0],)))
|
|
for t in threads:
|
|
t.start()
|
|
time.sleep(0.01)
|
|
for t in threads:
|
|
t.join()
|
|
if errors:
|
|
raise errors[0]
|
|
|
|
def test_join_with_timeout(self):
|
|
lock = _thread.allocate_lock()
|
|
lock.acquire()
|
|
|
|
def worker():
|
|
lock.acquire()
|
|
|
|
thread = threading.Thread(target=worker)
|
|
thread.start()
|
|
thread.join(timeout=0.01)
|
|
assert thread.is_alive()
|
|
lock.release()
|
|
thread.join()
|
|
assert not thread.is_alive()
|
|
|
|
def test_no_refcycle_through_target(self):
|
|
class RunSelfFunction(object):
|
|
def __init__(self, should_raise):
|
|
# The links in this refcycle from Thread back to self
|
|
# should be cleaned up when the thread completes.
|
|
self.should_raise = should_raise
|
|
self.thread = threading.Thread(target=self._run,
|
|
args=(self,),
|
|
kwargs={'yet_another':self})
|
|
self.thread.start()
|
|
|
|
def _run(self, other_ref, yet_another):
|
|
if self.should_raise:
|
|
raise SystemExit
|
|
|
|
restore_default_excepthook(self)
|
|
|
|
cyclic_object = RunSelfFunction(should_raise=False)
|
|
weak_cyclic_object = weakref.ref(cyclic_object)
|
|
cyclic_object.thread.join()
|
|
del cyclic_object
|
|
self.assertIsNone(weak_cyclic_object(),
|
|
msg=('%d references still around' %
|
|
sys.getrefcount(weak_cyclic_object())))
|
|
|
|
raising_cyclic_object = RunSelfFunction(should_raise=True)
|
|
weak_raising_cyclic_object = weakref.ref(raising_cyclic_object)
|
|
raising_cyclic_object.thread.join()
|
|
del raising_cyclic_object
|
|
self.assertIsNone(weak_raising_cyclic_object(),
|
|
msg=('%d references still around' %
|
|
sys.getrefcount(weak_raising_cyclic_object())))
|
|
|
|
def test_old_threading_api(self):
|
|
# Just a quick sanity check to make sure the old method names are
|
|
# still present
|
|
t = threading.Thread()
|
|
with self.assertWarnsRegex(DeprecationWarning,
|
|
r'get the daemon attribute'):
|
|
t.isDaemon()
|
|
with self.assertWarnsRegex(DeprecationWarning,
|
|
r'set the daemon attribute'):
|
|
t.setDaemon(True)
|
|
with self.assertWarnsRegex(DeprecationWarning,
|
|
r'get the name attribute'):
|
|
t.getName()
|
|
with self.assertWarnsRegex(DeprecationWarning,
|
|
r'set the name attribute'):
|
|
t.setName("name")
|
|
|
|
e = threading.Event()
|
|
with self.assertWarnsRegex(DeprecationWarning, 'use is_set()'):
|
|
e.isSet()
|
|
|
|
cond = threading.Condition()
|
|
cond.acquire()
|
|
with self.assertWarnsRegex(DeprecationWarning, 'use notify_all()'):
|
|
cond.notifyAll()
|
|
|
|
with self.assertWarnsRegex(DeprecationWarning, 'use active_count()'):
|
|
threading.activeCount()
|
|
with self.assertWarnsRegex(DeprecationWarning, 'use current_thread()'):
|
|
threading.currentThread()
|
|
|
|
def test_repr_daemon(self):
|
|
t = threading.Thread()
|
|
self.assertNotIn('daemon', repr(t))
|
|
t.daemon = True
|
|
self.assertIn('daemon', repr(t))
|
|
|
|
def test_daemon_param(self):
|
|
t = threading.Thread()
|
|
self.assertFalse(t.daemon)
|
|
t = threading.Thread(daemon=False)
|
|
self.assertFalse(t.daemon)
|
|
t = threading.Thread(daemon=True)
|
|
self.assertTrue(t.daemon)
|
|
|
|
@skip_unless_reliable_fork
|
|
def test_dummy_thread_after_fork(self):
|
|
# Issue #14308: a dummy thread in the active list doesn't mess up
|
|
# the after-fork mechanism.
|
|
code = """if 1:
|
|
import _thread, threading, os, time, warnings
|
|
|
|
def background_thread(evt):
|
|
# Creates and registers the _DummyThread instance
|
|
threading.current_thread()
|
|
evt.set()
|
|
time.sleep(10)
|
|
|
|
evt = threading.Event()
|
|
_thread.start_new_thread(background_thread, (evt,))
|
|
evt.wait()
|
|
assert threading.active_count() == 2, threading.active_count()
|
|
with warnings.catch_warnings(record=True) as ws:
|
|
warnings.filterwarnings(
|
|
"always", category=DeprecationWarning)
|
|
if os.fork() == 0:
|
|
assert threading.active_count() == 1, threading.active_count()
|
|
os._exit(0)
|
|
else:
|
|
assert ws[0].category == DeprecationWarning, ws[0]
|
|
assert 'fork' in str(ws[0].message), ws[0]
|
|
os.wait()
|
|
"""
|
|
_, out, err = assert_python_ok("-c", code)
|
|
self.assertEqual(out, b'')
|
|
self.assertEqual(err, b'')
|
|
|
|
@skip_unless_reliable_fork
|
|
def test_is_alive_after_fork(self):
|
|
# Try hard to trigger #18418: is_alive() could sometimes be True on
|
|
# threads that vanished after a fork.
|
|
old_interval = sys.getswitchinterval()
|
|
self.addCleanup(sys.setswitchinterval, old_interval)
|
|
|
|
# Make the bug more likely to manifest.
|
|
test.support.setswitchinterval(1e-6)
|
|
|
|
for i in range(20):
|
|
t = threading.Thread(target=lambda: None)
|
|
t.start()
|
|
# Ignore the warning about fork with threads.
|
|
with warnings.catch_warnings(category=DeprecationWarning,
|
|
action="ignore"):
|
|
if (pid := os.fork()) == 0:
|
|
os._exit(11 if t.is_alive() else 10)
|
|
else:
|
|
t.join()
|
|
|
|
support.wait_process(pid, exitcode=10)
|
|
|
|
def test_main_thread(self):
|
|
main = threading.main_thread()
|
|
self.assertEqual(main.name, 'MainThread')
|
|
self.assertEqual(main.ident, threading.current_thread().ident)
|
|
self.assertEqual(main.ident, threading.get_ident())
|
|
|
|
def f():
|
|
self.assertNotEqual(threading.main_thread().ident,
|
|
threading.current_thread().ident)
|
|
th = threading.Thread(target=f)
|
|
th.start()
|
|
th.join()
|
|
|
|
@skip_unless_reliable_fork
|
|
@unittest.skipUnless(hasattr(os, 'waitpid'), "test needs os.waitpid()")
|
|
def test_main_thread_after_fork(self):
|
|
code = """if 1:
|
|
import os, threading
|
|
from test import support
|
|
|
|
ident = threading.get_ident()
|
|
pid = os.fork()
|
|
if pid == 0:
|
|
print("current ident", threading.get_ident() == ident)
|
|
main = threading.main_thread()
|
|
print("main", main.name)
|
|
print("main ident", main.ident == ident)
|
|
print("current is main", threading.current_thread() is main)
|
|
else:
|
|
support.wait_process(pid, exitcode=0)
|
|
"""
|
|
_, out, err = assert_python_ok("-c", code)
|
|
data = out.decode().replace('\r', '')
|
|
self.assertEqual(err, b"")
|
|
self.assertEqual(data,
|
|
"current ident True\n"
|
|
"main MainThread\n"
|
|
"main ident True\n"
|
|
"current is main True\n")
|
|
|
|
@skip_unless_reliable_fork
|
|
@unittest.skipUnless(hasattr(os, 'waitpid'), "test needs os.waitpid()")
|
|
def test_main_thread_after_fork_from_nonmain_thread(self):
|
|
code = """if 1:
|
|
import os, threading, sys, warnings
|
|
from test import support
|
|
|
|
def func():
|
|
ident = threading.get_ident()
|
|
with warnings.catch_warnings(record=True) as ws:
|
|
warnings.filterwarnings(
|
|
"always", category=DeprecationWarning)
|
|
pid = os.fork()
|
|
if pid == 0:
|
|
print("current ident", threading.get_ident() == ident)
|
|
main = threading.main_thread()
|
|
print("main", main.name, type(main).__name__)
|
|
print("main ident", main.ident == ident)
|
|
print("current is main", threading.current_thread() is main)
|
|
# stdout is fully buffered because not a tty,
|
|
# we have to flush before exit.
|
|
sys.stdout.flush()
|
|
else:
|
|
assert ws[0].category == DeprecationWarning, ws[0]
|
|
assert 'fork' in str(ws[0].message), ws[0]
|
|
support.wait_process(pid, exitcode=0)
|
|
|
|
th = threading.Thread(target=func)
|
|
th.start()
|
|
th.join()
|
|
"""
|
|
_, out, err = assert_python_ok("-c", code)
|
|
data = out.decode().replace('\r', '')
|
|
self.assertEqual(err.decode('utf-8'), "")
|
|
self.assertEqual(data,
|
|
"current ident True\n"
|
|
"main Thread-1 (func) Thread\n"
|
|
"main ident True\n"
|
|
"current is main True\n"
|
|
)
|
|
|
|
@skip_unless_reliable_fork
|
|
@unittest.skipUnless(hasattr(os, 'waitpid'), "test needs os.waitpid()")
|
|
def test_main_thread_after_fork_from_foreign_thread(self, create_dummy=False):
|
|
code = """if 1:
|
|
import os, threading, sys, traceback, _thread
|
|
from test import support
|
|
|
|
def func(lock):
|
|
ident = threading.get_ident()
|
|
if %s:
|
|
# call current_thread() before fork to allocate DummyThread
|
|
current = threading.current_thread()
|
|
print("current", current.name, type(current).__name__)
|
|
print("ident in _active", ident in threading._active)
|
|
# flush before fork, so child won't flush it again
|
|
sys.stdout.flush()
|
|
pid = os.fork()
|
|
if pid == 0:
|
|
print("current ident", threading.get_ident() == ident)
|
|
main = threading.main_thread()
|
|
print("main", main.name, type(main).__name__)
|
|
print("main ident", main.ident == ident)
|
|
print("current is main", threading.current_thread() is main)
|
|
print("_dangling", [t.name for t in list(threading._dangling)])
|
|
# stdout is fully buffered because not a tty,
|
|
# we have to flush before exit.
|
|
sys.stdout.flush()
|
|
try:
|
|
threading._shutdown()
|
|
os._exit(0)
|
|
except:
|
|
traceback.print_exc()
|
|
sys.stderr.flush()
|
|
os._exit(1)
|
|
else:
|
|
try:
|
|
support.wait_process(pid, exitcode=0)
|
|
except Exception:
|
|
# avoid 'could not acquire lock for
|
|
# <_io.BufferedWriter name='<stderr>'> at interpreter shutdown,'
|
|
traceback.print_exc()
|
|
sys.stderr.flush()
|
|
finally:
|
|
lock.release()
|
|
|
|
join_lock = _thread.allocate_lock()
|
|
join_lock.acquire()
|
|
th = _thread.start_new_thread(func, (join_lock,))
|
|
join_lock.acquire()
|
|
""" % create_dummy
|
|
# "DeprecationWarning: This process is multi-threaded, use of fork()
|
|
# may lead to deadlocks in the child"
|
|
_, out, err = assert_python_ok("-W", "ignore::DeprecationWarning", "-c", code)
|
|
data = out.decode().replace('\r', '')
|
|
self.assertEqual(err.decode(), "")
|
|
self.assertEqual(data,
|
|
("current Dummy-1 _DummyThread\n" if create_dummy else "") +
|
|
f"ident in _active {create_dummy!s}\n" +
|
|
"current ident True\n"
|
|
"main MainThread _MainThread\n"
|
|
"main ident True\n"
|
|
"current is main True\n"
|
|
"_dangling ['MainThread']\n")
|
|
|
|
def test_main_thread_after_fork_from_dummy_thread(self, create_dummy=False):
|
|
self.test_main_thread_after_fork_from_foreign_thread(create_dummy=True)
|
|
|
|
def test_main_thread_during_shutdown(self):
|
|
# bpo-31516: current_thread() should still point to the main thread
|
|
# at shutdown
|
|
code = """if 1:
|
|
import gc, threading
|
|
|
|
main_thread = threading.current_thread()
|
|
assert main_thread is threading.main_thread() # sanity check
|
|
|
|
class RefCycle:
|
|
def __init__(self):
|
|
self.cycle = self
|
|
|
|
def __del__(self):
|
|
print("GC:",
|
|
threading.current_thread() is main_thread,
|
|
threading.main_thread() is main_thread,
|
|
threading.enumerate() == [main_thread])
|
|
|
|
RefCycle()
|
|
gc.collect() # sanity check
|
|
x = RefCycle()
|
|
"""
|
|
_, out, err = assert_python_ok("-c", code)
|
|
data = out.decode()
|
|
self.assertEqual(err, b"")
|
|
self.assertEqual(data.splitlines(),
|
|
["GC: True True True"] * 2)
|
|
|
|
def test_finalization_shutdown(self):
|
|
# bpo-36402: Py_Finalize() calls threading._shutdown() which must wait
|
|
# until Python thread states of all non-daemon threads get deleted.
|
|
#
|
|
# Test similar to SubinterpThreadingTests.test_threads_join_2(), but
|
|
# test the finalization of the main interpreter.
|
|
code = """if 1:
|
|
import os
|
|
import threading
|
|
import time
|
|
import random
|
|
|
|
def random_sleep():
|
|
seconds = random.random() * 0.010
|
|
time.sleep(seconds)
|
|
|
|
class Sleeper:
|
|
def __del__(self):
|
|
random_sleep()
|
|
|
|
tls = threading.local()
|
|
|
|
def f():
|
|
# Sleep a bit so that the thread is still running when
|
|
# Py_Finalize() is called.
|
|
random_sleep()
|
|
tls.x = Sleeper()
|
|
random_sleep()
|
|
|
|
threading.Thread(target=f).start()
|
|
random_sleep()
|
|
"""
|
|
rc, out, err = assert_python_ok("-c", code)
|
|
self.assertEqual(err, b"")
|
|
|
|
def test_repr_stopped(self):
|
|
# Verify that "stopped" shows up in repr(Thread) appropriately.
|
|
started = _thread.allocate_lock()
|
|
finish = _thread.allocate_lock()
|
|
started.acquire()
|
|
finish.acquire()
|
|
def f():
|
|
started.release()
|
|
finish.acquire()
|
|
t = threading.Thread(target=f)
|
|
t.start()
|
|
started.acquire()
|
|
self.assertIn("started", repr(t))
|
|
finish.release()
|
|
# "stopped" should appear in the repr in a reasonable amount of time.
|
|
# Implementation detail: as of this writing, that's trivially true
|
|
# if .join() is called, and almost trivially true if .is_alive() is
|
|
# called. The detail we're testing here is that "stopped" shows up
|
|
# "all on its own".
|
|
LOOKING_FOR = "stopped"
|
|
for i in range(500):
|
|
if LOOKING_FOR in repr(t):
|
|
break
|
|
time.sleep(0.01)
|
|
self.assertIn(LOOKING_FOR, repr(t)) # we waited at least 5 seconds
|
|
t.join()
|
|
|
|
def test_BoundedSemaphore_limit(self):
|
|
# BoundedSemaphore should raise ValueError if released too often.
|
|
for limit in range(1, 10):
|
|
bs = threading.BoundedSemaphore(limit)
|
|
threads = [threading.Thread(target=bs.acquire)
|
|
for _ in range(limit)]
|
|
for t in threads:
|
|
t.start()
|
|
for t in threads:
|
|
t.join()
|
|
threads = [threading.Thread(target=bs.release)
|
|
for _ in range(limit)]
|
|
for t in threads:
|
|
t.start()
|
|
for t in threads:
|
|
t.join()
|
|
self.assertRaises(ValueError, bs.release)
|
|
|
|
@cpython_only
|
|
def test_frame_tstate_tracing(self):
|
|
_testcapi = import_module("_testcapi")
|
|
# Issue #14432: Crash when a generator is created in a C thread that is
|
|
# destroyed while the generator is still used. The issue was that a
|
|
# generator contains a frame, and the frame kept a reference to the
|
|
# Python state of the destroyed C thread. The crash occurs when a trace
|
|
# function is setup.
|
|
|
|
def noop_trace(frame, event, arg):
|
|
# no operation
|
|
return noop_trace
|
|
|
|
def generator():
|
|
while 1:
|
|
yield "generator"
|
|
|
|
def callback():
|
|
if callback.gen is None:
|
|
callback.gen = generator()
|
|
return next(callback.gen)
|
|
callback.gen = None
|
|
|
|
old_trace = sys.gettrace()
|
|
sys.settrace(noop_trace)
|
|
try:
|
|
# Install a trace function
|
|
threading.settrace(noop_trace)
|
|
|
|
# Create a generator in a C thread which exits after the call
|
|
_testcapi.call_in_temporary_c_thread(callback)
|
|
|
|
# Call the generator in a different Python thread, check that the
|
|
# generator didn't keep a reference to the destroyed thread state
|
|
for test in range(3):
|
|
# The trace function is still called here
|
|
callback()
|
|
finally:
|
|
sys.settrace(old_trace)
|
|
threading.settrace(old_trace)
|
|
|
|
def test_gettrace(self):
|
|
def noop_trace(frame, event, arg):
|
|
# no operation
|
|
return noop_trace
|
|
old_trace = threading.gettrace()
|
|
try:
|
|
threading.settrace(noop_trace)
|
|
trace_func = threading.gettrace()
|
|
self.assertEqual(noop_trace,trace_func)
|
|
finally:
|
|
threading.settrace(old_trace)
|
|
|
|
def test_gettrace_all_threads(self):
|
|
def fn(*args): pass
|
|
old_trace = threading.gettrace()
|
|
first_check = threading.Event()
|
|
second_check = threading.Event()
|
|
|
|
trace_funcs = []
|
|
def checker():
|
|
trace_funcs.append(sys.gettrace())
|
|
first_check.set()
|
|
second_check.wait()
|
|
trace_funcs.append(sys.gettrace())
|
|
|
|
try:
|
|
t = threading.Thread(target=checker)
|
|
t.start()
|
|
first_check.wait()
|
|
threading.settrace_all_threads(fn)
|
|
second_check.set()
|
|
t.join()
|
|
self.assertEqual(trace_funcs, [None, fn])
|
|
self.assertEqual(threading.gettrace(), fn)
|
|
self.assertEqual(sys.gettrace(), fn)
|
|
finally:
|
|
threading.settrace_all_threads(old_trace)
|
|
|
|
self.assertEqual(threading.gettrace(), old_trace)
|
|
self.assertEqual(sys.gettrace(), old_trace)
|
|
|
|
def test_getprofile(self):
|
|
def fn(*args): pass
|
|
old_profile = threading.getprofile()
|
|
try:
|
|
threading.setprofile(fn)
|
|
self.assertEqual(fn, threading.getprofile())
|
|
finally:
|
|
threading.setprofile(old_profile)
|
|
|
|
def test_getprofile_all_threads(self):
|
|
def fn(*args): pass
|
|
old_profile = threading.getprofile()
|
|
first_check = threading.Event()
|
|
second_check = threading.Event()
|
|
|
|
profile_funcs = []
|
|
def checker():
|
|
profile_funcs.append(sys.getprofile())
|
|
first_check.set()
|
|
second_check.wait()
|
|
profile_funcs.append(sys.getprofile())
|
|
|
|
try:
|
|
t = threading.Thread(target=checker)
|
|
t.start()
|
|
first_check.wait()
|
|
threading.setprofile_all_threads(fn)
|
|
second_check.set()
|
|
t.join()
|
|
self.assertEqual(profile_funcs, [None, fn])
|
|
self.assertEqual(threading.getprofile(), fn)
|
|
self.assertEqual(sys.getprofile(), fn)
|
|
finally:
|
|
threading.setprofile_all_threads(old_profile)
|
|
|
|
self.assertEqual(threading.getprofile(), old_profile)
|
|
self.assertEqual(sys.getprofile(), old_profile)
|
|
|
|
def test_locals_at_exit(self):
|
|
# bpo-19466: thread locals must not be deleted before destructors
|
|
# are called
|
|
rc, out, err = assert_python_ok("-c", """if 1:
|
|
import threading
|
|
|
|
class Atexit:
|
|
def __del__(self):
|
|
print("thread_dict.atexit = %r" % thread_dict.atexit)
|
|
|
|
thread_dict = threading.local()
|
|
thread_dict.atexit = "value"
|
|
|
|
atexit = Atexit()
|
|
""")
|
|
self.assertEqual(out.rstrip(), b"thread_dict.atexit = 'value'")
|
|
|
|
def test_boolean_target(self):
|
|
# bpo-41149: A thread that had a boolean value of False would not
|
|
# run, regardless of whether it was callable. The correct behaviour
|
|
# is for a thread to do nothing if its target is None, and to call
|
|
# the target otherwise.
|
|
class BooleanTarget(object):
|
|
def __init__(self):
|
|
self.ran = False
|
|
def __bool__(self):
|
|
return False
|
|
def __call__(self):
|
|
self.ran = True
|
|
|
|
target = BooleanTarget()
|
|
thread = threading.Thread(target=target)
|
|
thread.start()
|
|
thread.join()
|
|
self.assertTrue(target.ran)
|
|
|
|
def test_leak_without_join(self):
|
|
# bpo-37788: Test that a thread which is not joined explicitly
|
|
# does not leak. Test written for reference leak checks.
|
|
def noop(): pass
|
|
with threading_helper.wait_threads_exit():
|
|
threading.Thread(target=noop).start()
|
|
# Thread.join() is not called
|
|
|
|
def test_import_from_another_thread(self):
|
|
# bpo-1596321: If the threading module is first import from a thread
|
|
# different than the main thread, threading._shutdown() must handle
|
|
# this case without logging an error at Python exit.
|
|
code = textwrap.dedent('''
|
|
import _thread
|
|
import sys
|
|
|
|
event = _thread.allocate_lock()
|
|
event.acquire()
|
|
|
|
def import_threading():
|
|
import threading
|
|
event.release()
|
|
|
|
if 'threading' in sys.modules:
|
|
raise Exception('threading is already imported')
|
|
|
|
_thread.start_new_thread(import_threading, ())
|
|
|
|
# wait until the threading module is imported
|
|
event.acquire()
|
|
event.release()
|
|
|
|
if 'threading' not in sys.modules:
|
|
raise Exception('threading is not imported')
|
|
|
|
# don't wait until the thread completes
|
|
''')
|
|
rc, out, err = assert_python_ok("-c", code)
|
|
self.assertEqual(out, b'')
|
|
self.assertEqual(err, b'')
|
|
|
|
def test_start_new_thread_at_finalization(self):
|
|
code = """if 1:
|
|
import _thread
|
|
|
|
def f():
|
|
print("shouldn't be printed")
|
|
|
|
class AtFinalization:
|
|
def __del__(self):
|
|
print("OK")
|
|
_thread.start_new_thread(f, ())
|
|
at_finalization = AtFinalization()
|
|
"""
|
|
_, out, err = assert_python_ok("-c", code)
|
|
self.assertEqual(out.strip(), b"OK")
|
|
self.assertIn(b"can't create new thread at interpreter shutdown", err)
|
|
|
|
@cpython_only
|
|
def test_finalize_daemon_thread_hang(self):
|
|
if support.check_sanitizer(thread=True, memory=True):
|
|
# the thread running `time.sleep(100)` below will still be alive
|
|
# at process exit
|
|
self.skipTest(
|
|
"https://github.com/python/cpython/issues/124878 - Known"
|
|
" race condition that TSAN identifies.")
|
|
# gh-87135: tests that daemon threads hang during finalization
|
|
script = textwrap.dedent('''
|
|
import os
|
|
import sys
|
|
import threading
|
|
import time
|
|
import _testcapi
|
|
|
|
lock = threading.Lock()
|
|
lock.acquire()
|
|
thread_started_event = threading.Event()
|
|
def thread_func():
|
|
try:
|
|
thread_started_event.set()
|
|
_testcapi.finalize_thread_hang(lock.acquire)
|
|
finally:
|
|
# Control must not reach here.
|
|
os._exit(2)
|
|
|
|
t = threading.Thread(target=thread_func)
|
|
t.daemon = True
|
|
t.start()
|
|
thread_started_event.wait()
|
|
# Sleep to ensure daemon thread is blocked on `lock.acquire`
|
|
#
|
|
# Note: This test is designed so that in the unlikely case that
|
|
# `0.1` seconds is not sufficient time for the thread to become
|
|
# blocked on `lock.acquire`, the test will still pass, it just
|
|
# won't be properly testing the thread behavior during
|
|
# finalization.
|
|
time.sleep(0.1)
|
|
|
|
def run_during_finalization():
|
|
# Wake up daemon thread
|
|
lock.release()
|
|
# Sleep to give the daemon thread time to crash if it is going
|
|
# to.
|
|
#
|
|
# Note: If due to an exceptionally slow execution this delay is
|
|
# insufficient, the test will still pass but will simply be
|
|
# ineffective as a test.
|
|
time.sleep(0.1)
|
|
# If control reaches here, the test succeeded.
|
|
os._exit(0)
|
|
|
|
# Replace sys.stderr.flush as a way to run code during finalization
|
|
orig_flush = sys.stderr.flush
|
|
def do_flush(*args, **kwargs):
|
|
orig_flush(*args, **kwargs)
|
|
if not sys.is_finalizing:
|
|
return
|
|
sys.stderr.flush = orig_flush
|
|
run_during_finalization()
|
|
|
|
sys.stderr.flush = do_flush
|
|
|
|
# If the follow exit code is retained, `run_during_finalization`
|
|
# did not run.
|
|
sys.exit(1)
|
|
''')
|
|
assert_python_ok("-c", script)
|
|
|
|
class ThreadJoinOnShutdown(BaseTestCase):
|
|
|
|
def _run_and_join(self, script):
|
|
script = """if 1:
|
|
import sys, os, time, threading
|
|
|
|
# a thread, which waits for the main program to terminate
|
|
def joiningfunc(mainthread):
|
|
mainthread.join()
|
|
print('end of thread')
|
|
# stdout is fully buffered because not a tty, we have to flush
|
|
# before exit.
|
|
sys.stdout.flush()
|
|
\n""" + script
|
|
|
|
rc, out, err = assert_python_ok("-c", script)
|
|
data = out.decode().replace('\r', '')
|
|
self.assertEqual(data, "end of main\nend of thread\n")
|
|
|
|
def test_1_join_on_shutdown(self):
|
|
# The usual case: on exit, wait for a non-daemon thread
|
|
script = """if 1:
|
|
import os
|
|
t = threading.Thread(target=joiningfunc,
|
|
args=(threading.current_thread(),))
|
|
t.start()
|
|
time.sleep(0.1)
|
|
print('end of main')
|
|
"""
|
|
self._run_and_join(script)
|
|
|
|
@skip_unless_reliable_fork
|
|
def test_2_join_in_forked_process(self):
|
|
# Like the test above, but from a forked interpreter
|
|
script = """if 1:
|
|
from test import support
|
|
|
|
childpid = os.fork()
|
|
if childpid != 0:
|
|
# parent process
|
|
support.wait_process(childpid, exitcode=0)
|
|
sys.exit(0)
|
|
|
|
# child process
|
|
t = threading.Thread(target=joiningfunc,
|
|
args=(threading.current_thread(),))
|
|
t.start()
|
|
print('end of main')
|
|
"""
|
|
self._run_and_join(script)
|
|
|
|
@skip_unless_reliable_fork
|
|
def test_3_join_in_forked_from_thread(self):
|
|
# Like the test above, but fork() was called from a worker thread
|
|
# In the forked process, the main Thread object must be marked as stopped.
|
|
|
|
script = """if 1:
|
|
from test import support
|
|
|
|
main_thread = threading.current_thread()
|
|
def worker():
|
|
childpid = os.fork()
|
|
if childpid != 0:
|
|
# parent process
|
|
support.wait_process(childpid, exitcode=0)
|
|
sys.exit(0)
|
|
|
|
# child process
|
|
t = threading.Thread(target=joiningfunc,
|
|
args=(main_thread,))
|
|
print('end of main')
|
|
t.start()
|
|
t.join() # Should not block: main_thread is already stopped
|
|
|
|
w = threading.Thread(target=worker)
|
|
w.start()
|
|
"""
|
|
self._run_and_join(script)
|
|
|
|
@unittest.skipIf(sys.platform in platforms_to_skip, "due to known OS bug")
|
|
def test_4_daemon_threads(self):
|
|
# Check that a daemon thread cannot crash the interpreter on shutdown
|
|
# by manipulating internal structures that are being disposed of in
|
|
# the main thread.
|
|
if support.check_sanitizer(thread=True):
|
|
# some of the threads running `random_io` below will still be alive
|
|
# at process exit
|
|
self.skipTest("TSAN would report thread leak")
|
|
|
|
script = """if True:
|
|
import os
|
|
import random
|
|
import sys
|
|
import time
|
|
import threading
|
|
|
|
thread_has_run = set()
|
|
|
|
def random_io():
|
|
'''Loop for a while sleeping random tiny amounts and doing some I/O.'''
|
|
import test.test_threading as mod
|
|
while True:
|
|
with open(mod.__file__, 'rb') as in_f:
|
|
stuff = in_f.read(200)
|
|
with open(os.devnull, 'wb') as null_f:
|
|
null_f.write(stuff)
|
|
time.sleep(random.random() / 1995)
|
|
thread_has_run.add(threading.current_thread())
|
|
|
|
def main():
|
|
count = 0
|
|
for _ in range(40):
|
|
new_thread = threading.Thread(target=random_io)
|
|
new_thread.daemon = True
|
|
new_thread.start()
|
|
count += 1
|
|
while len(thread_has_run) < count:
|
|
time.sleep(0.001)
|
|
# Trigger process shutdown
|
|
sys.exit(0)
|
|
|
|
main()
|
|
"""
|
|
rc, out, err = assert_python_ok('-c', script)
|
|
self.assertFalse(err)
|
|
|
|
def test_thread_from_thread(self):
|
|
script = """if True:
|
|
import threading
|
|
import time
|
|
|
|
def thread2():
|
|
time.sleep(0.05)
|
|
print("OK")
|
|
|
|
def thread1():
|
|
time.sleep(0.05)
|
|
t2 = threading.Thread(target=thread2)
|
|
t2.start()
|
|
|
|
t = threading.Thread(target=thread1)
|
|
t.start()
|
|
# do not join() -- the interpreter waits for non-daemon threads to
|
|
# finish.
|
|
"""
|
|
rc, out, err = assert_python_ok('-c', script)
|
|
self.assertEqual(err, b"")
|
|
self.assertEqual(out.strip(), b"OK")
|
|
self.assertEqual(rc, 0)
|
|
|
|
@skip_unless_reliable_fork
|
|
def test_reinit_tls_after_fork(self):
|
|
# Issue #13817: fork() would deadlock in a multithreaded program with
|
|
# the ad-hoc TLS implementation.
|
|
|
|
def do_fork_and_wait():
|
|
# just fork a child process and wait it
|
|
pid = os.fork()
|
|
if pid > 0:
|
|
support.wait_process(pid, exitcode=50)
|
|
else:
|
|
os._exit(50)
|
|
|
|
# Ignore the warning about fork with threads.
|
|
with warnings.catch_warnings(category=DeprecationWarning,
|
|
action="ignore"):
|
|
# start a bunch of threads that will fork() child processes
|
|
threads = []
|
|
for i in range(16):
|
|
t = threading.Thread(target=do_fork_and_wait)
|
|
threads.append(t)
|
|
t.start()
|
|
|
|
for t in threads:
|
|
t.join()
|
|
|
|
@skip_unless_reliable_fork
|
|
def test_clear_threads_states_after_fork(self):
|
|
# Issue #17094: check that threads states are cleared after fork()
|
|
|
|
# start a bunch of threads
|
|
threads = []
|
|
for i in range(16):
|
|
t = threading.Thread(target=lambda : time.sleep(0.3))
|
|
threads.append(t)
|
|
t.start()
|
|
|
|
try:
|
|
# Ignore the warning about fork with threads.
|
|
with warnings.catch_warnings(category=DeprecationWarning,
|
|
action="ignore"):
|
|
pid = os.fork()
|
|
if pid == 0:
|
|
# check that threads states have been cleared
|
|
if len(sys._current_frames()) == 1:
|
|
os._exit(51)
|
|
else:
|
|
os._exit(52)
|
|
else:
|
|
support.wait_process(pid, exitcode=51)
|
|
finally:
|
|
for t in threads:
|
|
t.join()
|
|
|
|
|
|
class SubinterpThreadingTests(BaseTestCase):
|
|
def pipe(self):
|
|
r, w = os.pipe()
|
|
self.addCleanup(os.close, r)
|
|
self.addCleanup(os.close, w)
|
|
if hasattr(os, 'set_blocking'):
|
|
os.set_blocking(r, False)
|
|
return (r, w)
|
|
|
|
def test_threads_join(self):
|
|
# Non-daemon threads should be joined at subinterpreter shutdown
|
|
# (issue #18808)
|
|
r, w = self.pipe()
|
|
code = textwrap.dedent(r"""
|
|
import os
|
|
import random
|
|
import threading
|
|
import time
|
|
|
|
def random_sleep():
|
|
seconds = random.random() * 0.010
|
|
time.sleep(seconds)
|
|
|
|
def f():
|
|
# Sleep a bit so that the thread is still running when
|
|
# Py_EndInterpreter is called.
|
|
random_sleep()
|
|
os.write(%d, b"x")
|
|
|
|
threading.Thread(target=f).start()
|
|
random_sleep()
|
|
""" % (w,))
|
|
ret = test.support.run_in_subinterp(code)
|
|
self.assertEqual(ret, 0)
|
|
# The thread was joined properly.
|
|
self.assertEqual(os.read(r, 1), b"x")
|
|
|
|
def test_threads_join_2(self):
|
|
# Same as above, but a delay gets introduced after the thread's
|
|
# Python code returned but before the thread state is deleted.
|
|
# To achieve this, we register a thread-local object which sleeps
|
|
# a bit when deallocated.
|
|
r, w = self.pipe()
|
|
code = textwrap.dedent(r"""
|
|
import os
|
|
import random
|
|
import threading
|
|
import time
|
|
|
|
def random_sleep():
|
|
seconds = random.random() * 0.010
|
|
time.sleep(seconds)
|
|
|
|
class Sleeper:
|
|
def __del__(self):
|
|
random_sleep()
|
|
|
|
tls = threading.local()
|
|
|
|
def f():
|
|
# Sleep a bit so that the thread is still running when
|
|
# Py_EndInterpreter is called.
|
|
random_sleep()
|
|
tls.x = Sleeper()
|
|
os.write(%d, b"x")
|
|
|
|
threading.Thread(target=f).start()
|
|
random_sleep()
|
|
""" % (w,))
|
|
ret = test.support.run_in_subinterp(code)
|
|
self.assertEqual(ret, 0)
|
|
# The thread was joined properly.
|
|
self.assertEqual(os.read(r, 1), b"x")
|
|
|
|
@requires_subinterpreters
|
|
def test_threads_join_with_no_main(self):
|
|
r_interp, w_interp = self.pipe()
|
|
|
|
INTERP = b'I'
|
|
FINI = b'F'
|
|
DONE = b'D'
|
|
|
|
interp = interpreters.create()
|
|
interp.exec(f"""if True:
|
|
import os
|
|
import threading
|
|
import time
|
|
|
|
done = False
|
|
|
|
def notify_fini():
|
|
global done
|
|
done = True
|
|
os.write({w_interp}, {FINI!r})
|
|
t.join()
|
|
threading._register_atexit(notify_fini)
|
|
|
|
def task():
|
|
while not done:
|
|
time.sleep(0.1)
|
|
os.write({w_interp}, {DONE!r})
|
|
t = threading.Thread(target=task)
|
|
t.start()
|
|
|
|
os.write({w_interp}, {INTERP!r})
|
|
""")
|
|
interp.close()
|
|
|
|
self.assertEqual(os.read(r_interp, 1), INTERP)
|
|
self.assertEqual(os.read(r_interp, 1), FINI)
|
|
self.assertEqual(os.read(r_interp, 1), DONE)
|
|
|
|
@cpython_only
|
|
def test_daemon_threads_fatal_error(self):
|
|
import_module("_testcapi")
|
|
subinterp_code = f"""if 1:
|
|
import os
|
|
import threading
|
|
import time
|
|
|
|
def f():
|
|
# Make sure the daemon thread is still running when
|
|
# Py_EndInterpreter is called.
|
|
time.sleep({test.support.SHORT_TIMEOUT})
|
|
threading.Thread(target=f, daemon=True).start()
|
|
"""
|
|
script = r"""if 1:
|
|
import _testcapi
|
|
|
|
_testcapi.run_in_subinterp(%r)
|
|
""" % (subinterp_code,)
|
|
with test.support.SuppressCrashReport():
|
|
rc, out, err = assert_python_failure("-c", script)
|
|
self.assertIn("Fatal Python error: Py_EndInterpreter: "
|
|
"not the last thread", err.decode())
|
|
|
|
def _check_allowed(self, before_start='', *,
|
|
allowed=True,
|
|
daemon_allowed=True,
|
|
daemon=False,
|
|
):
|
|
import_module("_testinternalcapi")
|
|
subinterp_code = textwrap.dedent(f"""
|
|
import test.support
|
|
import threading
|
|
def func():
|
|
print('this should not have run!')
|
|
t = threading.Thread(target=func, daemon={daemon})
|
|
{before_start}
|
|
t.start()
|
|
""")
|
|
check_multi_interp_extensions = bool(support.Py_GIL_DISABLED)
|
|
script = textwrap.dedent(f"""
|
|
import test.support
|
|
test.support.run_in_subinterp_with_config(
|
|
{subinterp_code!r},
|
|
use_main_obmalloc=True,
|
|
allow_fork=True,
|
|
allow_exec=True,
|
|
allow_threads={allowed},
|
|
allow_daemon_threads={daemon_allowed},
|
|
check_multi_interp_extensions={check_multi_interp_extensions},
|
|
own_gil=False,
|
|
)
|
|
""")
|
|
with test.support.SuppressCrashReport():
|
|
_, _, err = assert_python_ok("-c", script)
|
|
return err.decode()
|
|
|
|
@cpython_only
|
|
def test_threads_not_allowed(self):
|
|
err = self._check_allowed(
|
|
allowed=False,
|
|
daemon_allowed=False,
|
|
daemon=False,
|
|
)
|
|
self.assertIn('RuntimeError', err)
|
|
|
|
@cpython_only
|
|
def test_daemon_threads_not_allowed(self):
|
|
with self.subTest('via Thread()'):
|
|
err = self._check_allowed(
|
|
allowed=True,
|
|
daemon_allowed=False,
|
|
daemon=True,
|
|
)
|
|
self.assertIn('RuntimeError', err)
|
|
|
|
with self.subTest('via Thread.daemon setter'):
|
|
err = self._check_allowed(
|
|
't.daemon = True',
|
|
allowed=True,
|
|
daemon_allowed=False,
|
|
daemon=False,
|
|
)
|
|
self.assertIn('RuntimeError', err)
|
|
|
|
|
|
class ThreadingExceptionTests(BaseTestCase):
|
|
# A RuntimeError should be raised if Thread.start() is called
|
|
# multiple times.
|
|
def test_start_thread_again(self):
|
|
thread = threading.Thread()
|
|
thread.start()
|
|
self.assertRaises(RuntimeError, thread.start)
|
|
thread.join()
|
|
|
|
def test_joining_current_thread(self):
|
|
current_thread = threading.current_thread()
|
|
self.assertRaises(RuntimeError, current_thread.join);
|
|
|
|
def test_joining_inactive_thread(self):
|
|
thread = threading.Thread()
|
|
self.assertRaises(RuntimeError, thread.join)
|
|
|
|
def test_daemonize_active_thread(self):
|
|
thread = threading.Thread()
|
|
thread.start()
|
|
self.assertRaises(RuntimeError, setattr, thread, "daemon", True)
|
|
thread.join()
|
|
|
|
def test_releasing_unacquired_lock(self):
|
|
lock = threading.Lock()
|
|
self.assertRaises(RuntimeError, lock.release)
|
|
|
|
@requires_subprocess()
|
|
def test_recursion_limit(self):
|
|
# Issue 9670
|
|
# test that excessive recursion within a non-main thread causes
|
|
# an exception rather than crashing the interpreter on platforms
|
|
# like Mac OS X or FreeBSD which have small default stack sizes
|
|
# for threads
|
|
script = """if True:
|
|
import threading
|
|
|
|
def recurse():
|
|
return recurse()
|
|
|
|
def outer():
|
|
try:
|
|
recurse()
|
|
except RecursionError:
|
|
pass
|
|
|
|
w = threading.Thread(target=outer)
|
|
w.start()
|
|
w.join()
|
|
print('end of main thread')
|
|
"""
|
|
expected_output = "end of main thread\n"
|
|
p = subprocess.Popen([sys.executable, "-c", script],
|
|
stdout=subprocess.PIPE, stderr=subprocess.PIPE)
|
|
stdout, stderr = p.communicate()
|
|
data = stdout.decode().replace('\r', '')
|
|
self.assertEqual(p.returncode, 0, "Unexpected error: " + stderr.decode())
|
|
self.assertEqual(data, expected_output)
|
|
|
|
def test_print_exception(self):
|
|
script = r"""if True:
|
|
import threading
|
|
import time
|
|
|
|
running = False
|
|
def run():
|
|
global running
|
|
running = True
|
|
while running:
|
|
time.sleep(0.01)
|
|
1/0
|
|
t = threading.Thread(target=run)
|
|
t.start()
|
|
while not running:
|
|
time.sleep(0.01)
|
|
running = False
|
|
t.join()
|
|
"""
|
|
rc, out, err = assert_python_ok("-c", script)
|
|
self.assertEqual(out, b'')
|
|
err = err.decode()
|
|
self.assertIn("Exception in thread", err)
|
|
self.assertIn("Traceback (most recent call last):", err)
|
|
self.assertIn("ZeroDivisionError", err)
|
|
self.assertNotIn("Unhandled exception", err)
|
|
|
|
def test_print_exception_stderr_is_none_1(self):
|
|
script = r"""if True:
|
|
import sys
|
|
import threading
|
|
import time
|
|
|
|
running = False
|
|
def run():
|
|
global running
|
|
running = True
|
|
while running:
|
|
time.sleep(0.01)
|
|
1/0
|
|
t = threading.Thread(target=run)
|
|
t.start()
|
|
while not running:
|
|
time.sleep(0.01)
|
|
sys.stderr = None
|
|
running = False
|
|
t.join()
|
|
"""
|
|
rc, out, err = assert_python_ok("-c", script)
|
|
self.assertEqual(out, b'')
|
|
err = err.decode()
|
|
self.assertIn("Exception in thread", err)
|
|
self.assertIn("Traceback (most recent call last):", err)
|
|
self.assertIn("ZeroDivisionError", err)
|
|
self.assertNotIn("Unhandled exception", err)
|
|
|
|
def test_print_exception_stderr_is_none_2(self):
|
|
script = r"""if True:
|
|
import sys
|
|
import threading
|
|
import time
|
|
|
|
running = False
|
|
def run():
|
|
global running
|
|
running = True
|
|
while running:
|
|
time.sleep(0.01)
|
|
1/0
|
|
sys.stderr = None
|
|
t = threading.Thread(target=run)
|
|
t.start()
|
|
while not running:
|
|
time.sleep(0.01)
|
|
running = False
|
|
t.join()
|
|
"""
|
|
rc, out, err = assert_python_ok("-c", script)
|
|
self.assertEqual(out, b'')
|
|
self.assertNotIn("Unhandled exception", err.decode())
|
|
|
|
def test_print_exception_gh_102056(self):
|
|
# This used to crash. See gh-102056.
|
|
script = r"""if True:
|
|
import time
|
|
import threading
|
|
import _thread
|
|
|
|
def f():
|
|
try:
|
|
f()
|
|
except RecursionError:
|
|
f()
|
|
|
|
def g():
|
|
try:
|
|
raise ValueError()
|
|
except* ValueError:
|
|
f()
|
|
|
|
def h():
|
|
time.sleep(1)
|
|
_thread.interrupt_main()
|
|
|
|
t = threading.Thread(target=h)
|
|
t.start()
|
|
g()
|
|
t.join()
|
|
"""
|
|
|
|
assert_python_failure("-c", script)
|
|
|
|
def test_bare_raise_in_brand_new_thread(self):
|
|
def bare_raise():
|
|
raise
|
|
|
|
class Issue27558(threading.Thread):
|
|
exc = None
|
|
|
|
def run(self):
|
|
try:
|
|
bare_raise()
|
|
except Exception as exc:
|
|
self.exc = exc
|
|
|
|
thread = Issue27558()
|
|
thread.start()
|
|
thread.join()
|
|
self.assertIsNotNone(thread.exc)
|
|
self.assertIsInstance(thread.exc, RuntimeError)
|
|
# explicitly break the reference cycle to not leak a dangling thread
|
|
thread.exc = None
|
|
|
|
def test_multithread_modify_file_noerror(self):
|
|
# See issue25872
|
|
def modify_file():
|
|
with open(os_helper.TESTFN, 'w', encoding='utf-8') as fp:
|
|
fp.write(' ')
|
|
traceback.format_stack()
|
|
|
|
self.addCleanup(os_helper.unlink, os_helper.TESTFN)
|
|
threads = [
|
|
threading.Thread(target=modify_file)
|
|
for i in range(100)
|
|
]
|
|
for t in threads:
|
|
t.start()
|
|
t.join()
|
|
|
|
|
|
class ThreadRunFail(threading.Thread):
|
|
def run(self):
|
|
raise ValueError("run failed")
|
|
|
|
|
|
class ExceptHookTests(BaseTestCase):
|
|
def setUp(self):
|
|
restore_default_excepthook(self)
|
|
super().setUp()
|
|
|
|
@force_not_colorized
|
|
def test_excepthook(self):
|
|
with support.captured_output("stderr") as stderr:
|
|
thread = ThreadRunFail(name="excepthook thread")
|
|
thread.start()
|
|
thread.join()
|
|
|
|
stderr = stderr.getvalue().strip()
|
|
self.assertIn(f'Exception in thread {thread.name}:\n', stderr)
|
|
self.assertIn('Traceback (most recent call last):\n', stderr)
|
|
self.assertIn(' raise ValueError("run failed")', stderr)
|
|
self.assertIn('ValueError: run failed', stderr)
|
|
|
|
@support.cpython_only
|
|
@force_not_colorized
|
|
def test_excepthook_thread_None(self):
|
|
# threading.excepthook called with thread=None: log the thread
|
|
# identifier in this case.
|
|
with support.captured_output("stderr") as stderr:
|
|
try:
|
|
raise ValueError("bug")
|
|
except Exception as exc:
|
|
args = threading.ExceptHookArgs([*sys.exc_info(), None])
|
|
try:
|
|
threading.excepthook(args)
|
|
finally:
|
|
# Explicitly break a reference cycle
|
|
args = None
|
|
|
|
stderr = stderr.getvalue().strip()
|
|
self.assertIn(f'Exception in thread {threading.get_ident()}:\n', stderr)
|
|
self.assertIn('Traceback (most recent call last):\n', stderr)
|
|
self.assertIn(' raise ValueError("bug")', stderr)
|
|
self.assertIn('ValueError: bug', stderr)
|
|
|
|
def test_system_exit(self):
|
|
class ThreadExit(threading.Thread):
|
|
def run(self):
|
|
sys.exit(1)
|
|
|
|
# threading.excepthook() silently ignores SystemExit
|
|
with support.captured_output("stderr") as stderr:
|
|
thread = ThreadExit()
|
|
thread.start()
|
|
thread.join()
|
|
|
|
self.assertEqual(stderr.getvalue(), '')
|
|
|
|
def test_custom_excepthook(self):
|
|
args = None
|
|
|
|
def hook(hook_args):
|
|
nonlocal args
|
|
args = hook_args
|
|
|
|
try:
|
|
with support.swap_attr(threading, 'excepthook', hook):
|
|
thread = ThreadRunFail()
|
|
thread.start()
|
|
thread.join()
|
|
|
|
self.assertEqual(args.exc_type, ValueError)
|
|
self.assertEqual(str(args.exc_value), 'run failed')
|
|
self.assertEqual(args.exc_traceback, args.exc_value.__traceback__)
|
|
self.assertIs(args.thread, thread)
|
|
finally:
|
|
# Break reference cycle
|
|
args = None
|
|
|
|
def test_custom_excepthook_fail(self):
|
|
def threading_hook(args):
|
|
raise ValueError("threading_hook failed")
|
|
|
|
err_str = None
|
|
|
|
def sys_hook(exc_type, exc_value, exc_traceback):
|
|
nonlocal err_str
|
|
err_str = str(exc_value)
|
|
|
|
with support.swap_attr(threading, 'excepthook', threading_hook), \
|
|
support.swap_attr(sys, 'excepthook', sys_hook), \
|
|
support.captured_output('stderr') as stderr:
|
|
thread = ThreadRunFail()
|
|
thread.start()
|
|
thread.join()
|
|
|
|
self.assertEqual(stderr.getvalue(),
|
|
'Exception in threading.excepthook:\n')
|
|
self.assertEqual(err_str, 'threading_hook failed')
|
|
|
|
def test_original_excepthook(self):
|
|
def run_thread():
|
|
with support.captured_output("stderr") as output:
|
|
thread = ThreadRunFail(name="excepthook thread")
|
|
thread.start()
|
|
thread.join()
|
|
return output.getvalue()
|
|
|
|
def threading_hook(args):
|
|
print("Running a thread failed", file=sys.stderr)
|
|
|
|
default_output = run_thread()
|
|
with support.swap_attr(threading, 'excepthook', threading_hook):
|
|
custom_hook_output = run_thread()
|
|
threading.excepthook = threading.__excepthook__
|
|
recovered_output = run_thread()
|
|
|
|
self.assertEqual(default_output, recovered_output)
|
|
self.assertNotEqual(default_output, custom_hook_output)
|
|
self.assertEqual(custom_hook_output, "Running a thread failed\n")
|
|
|
|
|
|
class TimerTests(BaseTestCase):
|
|
|
|
def setUp(self):
|
|
BaseTestCase.setUp(self)
|
|
self.callback_args = []
|
|
self.callback_event = threading.Event()
|
|
|
|
def test_init_immutable_default_args(self):
|
|
# Issue 17435: constructor defaults were mutable objects, they could be
|
|
# mutated via the object attributes and affect other Timer objects.
|
|
timer1 = threading.Timer(0.01, self._callback_spy)
|
|
timer1.start()
|
|
self.callback_event.wait()
|
|
timer1.args.append("blah")
|
|
timer1.kwargs["foo"] = "bar"
|
|
self.callback_event.clear()
|
|
timer2 = threading.Timer(0.01, self._callback_spy)
|
|
timer2.start()
|
|
self.callback_event.wait()
|
|
self.assertEqual(len(self.callback_args), 2)
|
|
self.assertEqual(self.callback_args, [((), {}), ((), {})])
|
|
timer1.join()
|
|
timer2.join()
|
|
|
|
def _callback_spy(self, *args, **kwargs):
|
|
self.callback_args.append((args[:], kwargs.copy()))
|
|
self.callback_event.set()
|
|
|
|
class LockTests(lock_tests.LockTests):
|
|
locktype = staticmethod(threading.Lock)
|
|
|
|
class PyRLockTests(lock_tests.RLockTests):
|
|
locktype = staticmethod(threading._PyRLock)
|
|
|
|
@unittest.skipIf(threading._CRLock is None, 'RLock not implemented in C')
|
|
class CRLockTests(lock_tests.RLockTests):
|
|
locktype = staticmethod(threading._CRLock)
|
|
|
|
def test_signature(self): # gh-102029
|
|
with warnings.catch_warnings(record=True) as warnings_log:
|
|
threading.RLock()
|
|
self.assertEqual(warnings_log, [])
|
|
|
|
arg_types = [
|
|
((1,), {}),
|
|
((), {'a': 1}),
|
|
((1, 2), {'a': 1}),
|
|
]
|
|
for args, kwargs in arg_types:
|
|
with self.subTest(args=args, kwargs=kwargs):
|
|
with self.assertWarns(DeprecationWarning):
|
|
threading.RLock(*args, **kwargs)
|
|
|
|
# Subtypes with custom `__init__` are allowed (but, not recommended):
|
|
class CustomRLock(self.locktype):
|
|
def __init__(self, a, *, b) -> None:
|
|
super().__init__()
|
|
|
|
with warnings.catch_warnings(record=True) as warnings_log:
|
|
CustomRLock(1, b=2)
|
|
self.assertEqual(warnings_log, [])
|
|
|
|
class EventTests(lock_tests.EventTests):
|
|
eventtype = staticmethod(threading.Event)
|
|
|
|
class ConditionAsRLockTests(lock_tests.RLockTests):
|
|
# Condition uses an RLock by default and exports its API.
|
|
locktype = staticmethod(threading.Condition)
|
|
|
|
def test_recursion_count(self):
|
|
self.skipTest("Condition does not expose _recursion_count()")
|
|
|
|
class ConditionTests(lock_tests.ConditionTests):
|
|
condtype = staticmethod(threading.Condition)
|
|
|
|
class SemaphoreTests(lock_tests.SemaphoreTests):
|
|
semtype = staticmethod(threading.Semaphore)
|
|
|
|
class BoundedSemaphoreTests(lock_tests.BoundedSemaphoreTests):
|
|
semtype = staticmethod(threading.BoundedSemaphore)
|
|
|
|
class BarrierTests(lock_tests.BarrierTests):
|
|
barriertype = staticmethod(threading.Barrier)
|
|
|
|
|
|
class MiscTestCase(unittest.TestCase):
|
|
def test__all__(self):
|
|
restore_default_excepthook(self)
|
|
|
|
extra = {"ThreadError"}
|
|
not_exported = {'currentThread', 'activeCount'}
|
|
support.check__all__(self, threading, ('threading', '_thread'),
|
|
extra=extra, not_exported=not_exported)
|
|
|
|
|
|
class InterruptMainTests(unittest.TestCase):
|
|
def check_interrupt_main_with_signal_handler(self, signum):
|
|
def handler(signum, frame):
|
|
1/0
|
|
|
|
old_handler = signal.signal(signum, handler)
|
|
self.addCleanup(signal.signal, signum, old_handler)
|
|
|
|
with self.assertRaises(ZeroDivisionError):
|
|
_thread.interrupt_main()
|
|
|
|
def check_interrupt_main_noerror(self, signum):
|
|
handler = signal.getsignal(signum)
|
|
try:
|
|
# No exception should arise.
|
|
signal.signal(signum, signal.SIG_IGN)
|
|
_thread.interrupt_main(signum)
|
|
|
|
signal.signal(signum, signal.SIG_DFL)
|
|
_thread.interrupt_main(signum)
|
|
finally:
|
|
# Restore original handler
|
|
signal.signal(signum, handler)
|
|
|
|
@requires_gil_enabled("gh-118433: Flaky due to a longstanding bug")
|
|
def test_interrupt_main_subthread(self):
|
|
# Calling start_new_thread with a function that executes interrupt_main
|
|
# should raise KeyboardInterrupt upon completion.
|
|
def call_interrupt():
|
|
_thread.interrupt_main()
|
|
t = threading.Thread(target=call_interrupt)
|
|
with self.assertRaises(KeyboardInterrupt):
|
|
t.start()
|
|
t.join()
|
|
t.join()
|
|
|
|
def test_interrupt_main_mainthread(self):
|
|
# Make sure that if interrupt_main is called in main thread that
|
|
# KeyboardInterrupt is raised instantly.
|
|
with self.assertRaises(KeyboardInterrupt):
|
|
_thread.interrupt_main()
|
|
|
|
def test_interrupt_main_with_signal_handler(self):
|
|
self.check_interrupt_main_with_signal_handler(signal.SIGINT)
|
|
self.check_interrupt_main_with_signal_handler(signal.SIGTERM)
|
|
|
|
def test_interrupt_main_noerror(self):
|
|
self.check_interrupt_main_noerror(signal.SIGINT)
|
|
self.check_interrupt_main_noerror(signal.SIGTERM)
|
|
|
|
def test_interrupt_main_invalid_signal(self):
|
|
self.assertRaises(ValueError, _thread.interrupt_main, -1)
|
|
self.assertRaises(ValueError, _thread.interrupt_main, signal.NSIG)
|
|
self.assertRaises(ValueError, _thread.interrupt_main, 1000000)
|
|
|
|
@threading_helper.reap_threads
|
|
def test_can_interrupt_tight_loops(self):
|
|
cont = [True]
|
|
started = [False]
|
|
interrupted = [False]
|
|
|
|
def worker(started, cont, interrupted):
|
|
iterations = 100_000_000
|
|
started[0] = True
|
|
while cont[0]:
|
|
if iterations:
|
|
iterations -= 1
|
|
else:
|
|
return
|
|
pass
|
|
interrupted[0] = True
|
|
|
|
t = threading.Thread(target=worker,args=(started, cont, interrupted))
|
|
t.start()
|
|
while not started[0]:
|
|
pass
|
|
cont[0] = False
|
|
t.join()
|
|
self.assertTrue(interrupted[0])
|
|
|
|
|
|
class AtexitTests(unittest.TestCase):
|
|
|
|
def test_atexit_output(self):
|
|
rc, out, err = assert_python_ok("-c", """if True:
|
|
import threading
|
|
|
|
def run_last():
|
|
print('parrot')
|
|
|
|
threading._register_atexit(run_last)
|
|
""")
|
|
|
|
self.assertFalse(err)
|
|
self.assertEqual(out.strip(), b'parrot')
|
|
|
|
def test_atexit_called_once(self):
|
|
rc, out, err = assert_python_ok("-c", """if True:
|
|
import threading
|
|
from unittest.mock import Mock
|
|
|
|
mock = Mock()
|
|
threading._register_atexit(mock)
|
|
mock.assert_not_called()
|
|
# force early shutdown to ensure it was called once
|
|
threading._shutdown()
|
|
mock.assert_called_once()
|
|
""")
|
|
|
|
self.assertFalse(err)
|
|
|
|
def test_atexit_after_shutdown(self):
|
|
# The only way to do this is by registering an atexit within
|
|
# an atexit, which is intended to raise an exception.
|
|
rc, out, err = assert_python_ok("-c", """if True:
|
|
import threading
|
|
|
|
def func():
|
|
pass
|
|
|
|
def run_last():
|
|
threading._register_atexit(func)
|
|
|
|
threading._register_atexit(run_last)
|
|
""")
|
|
|
|
self.assertTrue(err)
|
|
self.assertIn("RuntimeError: can't register atexit after shutdown",
|
|
err.decode())
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|