mirror of https://github.com/python/cpython
721 lines
27 KiB
Python
721 lines
27 KiB
Python
# Very rudimentary test of threading module
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import test.support
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from test.support import verbose, strip_python_stderr
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import random
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import re
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import sys
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_thread = test.support.import_module('_thread')
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threading = test.support.import_module('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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from test import lock_tests
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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.assertTrue(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.assertTrue(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 = test.support.threading_setup()
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def tearDown(self):
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test.support.threading_cleanup(*self._threads)
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test.support.reap_children()
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class ThreadTests(BaseTestCase):
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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.assertEqual(t.ident, None)
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self.assertTrue(re.match('<TestThread\(.*, initial\)>', repr(t)))
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t.start()
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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(NUMTASKS)
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self.assertTrue(not t.is_alive())
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self.assertNotEqual(t.ident, 0)
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self.assertFalse(t.ident is None)
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self.assertTrue(re.match('<TestThread\(.*, stopped -?\d+\)>',
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repr(t)))
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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.assertFalse(threading.currentThread().ident is None)
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def f():
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ident.append(threading.currentThread().ident)
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done.set()
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done = threading.Event()
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ident = []
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_thread.start_new_thread(f, ())
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done.wait()
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self.assertFalse(ident[0] is None)
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# Kill the "immortal" _DummyThread
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del threading._active[ident[0]]
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# run with a small(ish) thread stack size (256kB)
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def test_various_ops_small_stack(self):
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if verbose:
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print('with 256kB 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 (1MB)
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def test_various_ops_large_stack(self):
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if verbose:
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print('with 1MB 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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def f(mutex):
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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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threading.current_thread()
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mutex.release()
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mutex = threading.Lock()
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mutex.acquire()
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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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self.assertIn(tid, threading._active)
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self.assertIsInstance(threading._active[tid], threading._DummyThread)
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del threading._active[tid]
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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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try:
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import ctypes
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except ImportError:
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raise unittest.SkipTest("cannot import ctypes")
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set_async_exc = ctypes.pythonapi.PyThreadState_SetAsyncExc
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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 = _thread.get_ident()
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try:
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result = set_async_exc(ctypes.c_long(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 = _thread.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(ctypes.c_long(-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.assertTrue(not 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(ctypes.c_long(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=10)
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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):
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raise threading.ThreadError()
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_start_new_thread = threading._start_new_thread
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threading._start_new_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_new_thread = _start_new_thread
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def test_finalize_runnning_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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try:
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import ctypes
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except ImportError:
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raise unittest.SkipTest("cannot import ctypes")
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rc = subprocess.call([sys.executable, "-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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p = subprocess.Popen([sys.executable, "-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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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE)
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self.addCleanup(p.stdout.close)
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self.addCleanup(p.stderr.close)
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stdout, stderr = p.communicate()
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rc = p.returncode
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self.assertFalse(rc == 2, "interpreted was blocked")
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self.assertTrue(rc == 0,
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"Unexpected error: " + ascii(stderr))
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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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p = subprocess.Popen([sys.executable, "-c", """if 1:
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import threading
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from time import sleep
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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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stdout=subprocess.PIPE,
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stderr=subprocess.PIPE)
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self.addCleanup(p.stdout.close)
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self.addCleanup(p.stderr.close)
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stdout, stderr = p.communicate()
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self.assertEqual(stdout.strip(),
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b"Woke up, sleep function is: <built-in function sleep>")
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stderr = strip_python_stderr(stderr)
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self.assertEqual(stderr, 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()
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try:
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for i in range(1, 100):
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sys.setswitchinterval(i * 0.0002)
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t = threading.Thread(target=lambda: None)
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t.start()
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t.join()
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l = enum()
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self.assertNotIn(t, l,
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"#1703448 triggered after %d trials: %s" % (i, l))
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finally:
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sys.setswitchinterval(old_interval)
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def test_no_refcycle_through_target(self):
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class RunSelfFunction(object):
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def __init__(self, should_raise):
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# The links in this refcycle from Thread back to self
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# should be cleaned up when the thread completes.
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self.should_raise = should_raise
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self.thread = threading.Thread(target=self._run,
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args=(self,),
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kwargs={'yet_another':self})
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self.thread.start()
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def _run(self, other_ref, yet_another):
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if self.should_raise:
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raise SystemExit
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cyclic_object = RunSelfFunction(should_raise=False)
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weak_cyclic_object = weakref.ref(cyclic_object)
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cyclic_object.thread.join()
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del cyclic_object
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self.assertIsNone(weak_cyclic_object(),
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msg=('%d references still around' %
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sys.getrefcount(weak_cyclic_object())))
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raising_cyclic_object = RunSelfFunction(should_raise=True)
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weak_raising_cyclic_object = weakref.ref(raising_cyclic_object)
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raising_cyclic_object.thread.join()
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del raising_cyclic_object
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self.assertIsNone(weak_raising_cyclic_object(),
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msg=('%d references still around' %
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sys.getrefcount(weak_raising_cyclic_object())))
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def test_old_threading_api(self):
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# Just a quick sanity check to make sure the old method names are
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# still present
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t = threading.Thread()
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t.isDaemon()
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t.setDaemon(True)
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t.getName()
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t.setName("name")
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t.isAlive()
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e = threading.Event()
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e.isSet()
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threading.activeCount()
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def test_repr_daemon(self):
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t = threading.Thread()
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self.assertFalse('daemon' in repr(t))
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t.daemon = True
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self.assertTrue('daemon' in repr(t))
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class ThreadJoinOnShutdown(BaseTestCase):
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def _run_and_join(self, script):
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script = """if 1:
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import sys, os, time, threading
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# a thread, which waits for the main program to terminate
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def joiningfunc(mainthread):
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mainthread.join()
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print('end of thread')
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# stdout is fully buffered because not a tty, we have to flush
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# before exit.
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sys.stdout.flush()
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\n""" + script
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p = subprocess.Popen([sys.executable, "-c", script], stdout=subprocess.PIPE)
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rc = p.wait()
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data = p.stdout.read().decode().replace('\r', '')
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p.stdout.close()
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self.assertEqual(data, "end of main\nend of thread\n")
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self.assertFalse(rc == 2, "interpreter was blocked")
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self.assertTrue(rc == 0, "Unexpected error")
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def test_1_join_on_shutdown(self):
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# The usual case: on exit, wait for a non-daemon thread
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script = """if 1:
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import os
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t = threading.Thread(target=joiningfunc,
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args=(threading.current_thread(),))
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t.start()
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time.sleep(0.1)
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print('end of main')
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"""
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self._run_and_join(script)
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@unittest.skipUnless(hasattr(os, 'fork'), "needs os.fork()")
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def test_2_join_in_forked_process(self):
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# Like the test above, but from a forked interpreter
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script = """if 1:
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childpid = os.fork()
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if childpid != 0:
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os.waitpid(childpid, 0)
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sys.exit(0)
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t = threading.Thread(target=joiningfunc,
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args=(threading.current_thread(),))
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t.start()
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print('end of main')
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"""
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self._run_and_join(script)
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@unittest.skipUnless(hasattr(os, 'fork'), "needs os.fork()")
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def test_3_join_in_forked_from_thread(self):
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# Like the test above, but fork() was called from a worker thread
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# In the forked process, the main Thread object must be marked as stopped.
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# Skip platforms with known problems forking from a worker thread.
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# See http://bugs.python.org/issue3863.
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if sys.platform in ('freebsd4', 'freebsd5', 'freebsd6', 'netbsd5',
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'os2emx'):
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raise unittest.SkipTest('due to known OS bugs on ' + sys.platform)
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script = """if 1:
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main_thread = threading.current_thread()
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def worker():
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childpid = os.fork()
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if childpid != 0:
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os.waitpid(childpid, 0)
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sys.exit(0)
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t = threading.Thread(target=joiningfunc,
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args=(main_thread,))
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print('end of main')
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t.start()
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t.join() # Should not block: main_thread is already stopped
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w = threading.Thread(target=worker)
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w.start()
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"""
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self._run_and_join(script)
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def assertScriptHasOutput(self, script, expected_output):
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p = subprocess.Popen([sys.executable, "-c", script],
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stdout=subprocess.PIPE)
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stdout, stderr = p.communicate()
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data = stdout.decode().replace('\r', '')
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self.assertEqual(p.returncode, 0, "Unexpected error")
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self.assertEqual(data, expected_output)
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@unittest.skipUnless(hasattr(os, 'fork'), "needs os.fork()")
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def test_4_joining_across_fork_in_worker_thread(self):
|
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# There used to be a possible deadlock when forking from a child
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|
# thread. See http://bugs.python.org/issue6643.
|
|
|
|
# Skip platforms with known problems forking from a worker thread.
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|
# See http://bugs.python.org/issue3863.
|
|
if sys.platform in ('freebsd4', 'freebsd5', 'freebsd6', 'os2emx'):
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raise unittest.SkipTest('due to known OS bugs on ' + sys.platform)
|
|
|
|
# The script takes the following steps:
|
|
# - The main thread in the parent process starts a new thread and then
|
|
# tries to join it.
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|
# - The join operation acquires the Lock inside the thread's _block
|
|
# Condition. (See threading.py:Thread.join().)
|
|
# - We stub out the acquire method on the condition to force it to wait
|
|
# until the child thread forks. (See LOCK ACQUIRED HERE)
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|
# - The child thread forks. (See LOCK HELD and WORKER THREAD FORKS
|
|
# HERE)
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|
# - The main thread of the parent process enters Condition.wait(),
|
|
# which releases the lock on the child thread.
|
|
# - The child process returns. Without the necessary fix, when the
|
|
# main thread of the child process (which used to be the child thread
|
|
# in the parent process) attempts to exit, it will try to acquire the
|
|
# lock in the Thread._block Condition object and hang, because the
|
|
# lock was held across the fork.
|
|
|
|
script = """if 1:
|
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import os, time, threading
|
|
|
|
finish_join = False
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|
start_fork = False
|
|
|
|
def worker():
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|
# Wait until this thread's lock is acquired before forking to
|
|
# create the deadlock.
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|
global finish_join
|
|
while not start_fork:
|
|
time.sleep(0.01)
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|
# LOCK HELD: Main thread holds lock across this call.
|
|
childpid = os.fork()
|
|
finish_join = True
|
|
if childpid != 0:
|
|
# Parent process just waits for child.
|
|
os.waitpid(childpid, 0)
|
|
# Child process should just return.
|
|
|
|
w = threading.Thread(target=worker)
|
|
|
|
# Stub out the private condition variable's lock acquire method.
|
|
# This acquires the lock and then waits until the child has forked
|
|
# before returning, which will release the lock soon after. If
|
|
# someone else tries to fix this test case by acquiring this lock
|
|
# before forking instead of resetting it, the test case will
|
|
# deadlock when it shouldn't.
|
|
condition = w._block
|
|
orig_acquire = condition.acquire
|
|
call_count_lock = threading.Lock()
|
|
call_count = 0
|
|
def my_acquire():
|
|
global call_count
|
|
global start_fork
|
|
orig_acquire() # LOCK ACQUIRED HERE
|
|
start_fork = True
|
|
if call_count == 0:
|
|
while not finish_join:
|
|
time.sleep(0.01) # WORKER THREAD FORKS HERE
|
|
with call_count_lock:
|
|
call_count += 1
|
|
condition.acquire = my_acquire
|
|
|
|
w.start()
|
|
w.join()
|
|
print('end of main')
|
|
"""
|
|
self.assertScriptHasOutput(script, "end of main\n")
|
|
|
|
@unittest.skipUnless(hasattr(os, 'fork'), "needs os.fork()")
|
|
def test_5_clear_waiter_locks_to_avoid_crash(self):
|
|
# Check that a spawned thread that forks doesn't segfault on certain
|
|
# platforms, namely OS X. This used to happen if there was a waiter
|
|
# lock in the thread's condition variable's waiters list. Even though
|
|
# we know the lock will be held across the fork, it is not safe to
|
|
# release locks held across forks on all platforms, so releasing the
|
|
# waiter lock caused a segfault on OS X. Furthermore, since locks on
|
|
# OS X are (as of this writing) implemented with a mutex + condition
|
|
# variable instead of a semaphore, while we know that the Python-level
|
|
# lock will be acquired, we can't know if the internal mutex will be
|
|
# acquired at the time of the fork.
|
|
|
|
# Skip platforms with known problems forking from a worker thread.
|
|
# See http://bugs.python.org/issue3863.
|
|
if sys.platform in ('freebsd4', 'freebsd5', 'freebsd6', 'os2emx'):
|
|
raise unittest.SkipTest('due to known OS bugs on ' + sys.platform)
|
|
script = """if True:
|
|
import os, time, threading
|
|
|
|
start_fork = False
|
|
|
|
def worker():
|
|
# Wait until the main thread has attempted to join this thread
|
|
# before continuing.
|
|
while not start_fork:
|
|
time.sleep(0.01)
|
|
childpid = os.fork()
|
|
if childpid != 0:
|
|
# Parent process just waits for child.
|
|
(cpid, rc) = os.waitpid(childpid, 0)
|
|
assert cpid == childpid
|
|
assert rc == 0
|
|
print('end of worker thread')
|
|
else:
|
|
# Child process should just return.
|
|
pass
|
|
|
|
w = threading.Thread(target=worker)
|
|
|
|
# Stub out the private condition variable's _release_save method.
|
|
# This releases the condition's lock and flips the global that
|
|
# causes the worker to fork. At this point, the problematic waiter
|
|
# lock has been acquired once by the waiter and has been put onto
|
|
# the waiters list.
|
|
condition = w._block
|
|
orig_release_save = condition._release_save
|
|
def my_release_save():
|
|
global start_fork
|
|
orig_release_save()
|
|
# Waiter lock held here, condition lock released.
|
|
start_fork = True
|
|
condition._release_save = my_release_save
|
|
|
|
w.start()
|
|
w.join()
|
|
print('end of main thread')
|
|
"""
|
|
output = "end of worker thread\nend of main thread\n"
|
|
self.assertScriptHasOutput(script, output)
|
|
|
|
|
|
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)
|
|
|
|
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)
|
|
|
|
|
|
class LockTests(lock_tests.LockTests):
|
|
locktype = staticmethod(threading.Lock)
|
|
|
|
class PyRLockTests(lock_tests.RLockTests):
|
|
locktype = staticmethod(threading._PyRLock)
|
|
|
|
class CRLockTests(lock_tests.RLockTests):
|
|
locktype = staticmethod(threading._CRLock)
|
|
|
|
class EventTests(lock_tests.EventTests):
|
|
eventtype = staticmethod(threading.Event)
|
|
|
|
class ConditionAsRLockTests(lock_tests.RLockTests):
|
|
# An Condition uses an RLock by default and exports its API.
|
|
locktype = staticmethod(threading.Condition)
|
|
|
|
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)
|
|
|
|
def test_main():
|
|
test.support.run_unittest(LockTests, PyRLockTests, CRLockTests, EventTests,
|
|
ConditionAsRLockTests, ConditionTests,
|
|
SemaphoreTests, BoundedSemaphoreTests,
|
|
ThreadTests,
|
|
ThreadJoinOnShutdown,
|
|
ThreadingExceptionTests,
|
|
BarrierTests
|
|
)
|
|
|
|
if __name__ == "__main__":
|
|
test_main()
|