263 lines
8.2 KiB
Python
263 lines
8.2 KiB
Python
import os
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import unittest
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import random
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from test import support
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thread = support.import_module('_thread')
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import time
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import sys
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import weakref
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from test import lock_tests
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NUMTASKS = 10
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NUMTRIPS = 3
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_print_mutex = thread.allocate_lock()
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def verbose_print(arg):
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"""Helper function for printing out debugging output."""
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if support.verbose:
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with _print_mutex:
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print(arg)
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class BasicThreadTest(unittest.TestCase):
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def setUp(self):
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self.done_mutex = thread.allocate_lock()
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self.done_mutex.acquire()
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self.running_mutex = thread.allocate_lock()
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self.random_mutex = thread.allocate_lock()
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self.created = 0
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self.running = 0
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self.next_ident = 0
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key = support.threading_setup()
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self.addCleanup(support.threading_cleanup, *key)
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class ThreadRunningTests(BasicThreadTest):
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def newtask(self):
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with self.running_mutex:
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self.next_ident += 1
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verbose_print("creating task %s" % self.next_ident)
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thread.start_new_thread(self.task, (self.next_ident,))
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self.created += 1
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self.running += 1
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def task(self, ident):
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with self.random_mutex:
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delay = random.random() / 10000.0
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verbose_print("task %s will run for %sus" % (ident, round(delay*1e6)))
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time.sleep(delay)
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verbose_print("task %s done" % ident)
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with self.running_mutex:
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self.running -= 1
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if self.created == NUMTASKS and self.running == 0:
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self.done_mutex.release()
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def test_starting_threads(self):
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# Basic test for thread creation.
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for i in range(NUMTASKS):
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self.newtask()
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verbose_print("waiting for tasks to complete...")
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self.done_mutex.acquire()
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verbose_print("all tasks done")
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def test_stack_size(self):
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# Various stack size tests.
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self.assertEqual(thread.stack_size(), 0, "initial stack size is not 0")
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thread.stack_size(0)
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self.assertEqual(thread.stack_size(), 0, "stack_size not reset to default")
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@unittest.skipIf(os.name not in ("nt", "posix"), 'test meant for nt and posix')
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def test_nt_and_posix_stack_size(self):
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try:
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thread.stack_size(4096)
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except ValueError:
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verbose_print("caught expected ValueError setting "
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"stack_size(4096)")
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except thread.error:
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self.skipTest("platform does not support changing thread stack "
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"size")
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fail_msg = "stack_size(%d) failed - should succeed"
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for tss in (262144, 0x100000, 0):
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thread.stack_size(tss)
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self.assertEqual(thread.stack_size(), tss, fail_msg % tss)
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verbose_print("successfully set stack_size(%d)" % tss)
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for tss in (262144, 0x100000):
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verbose_print("trying stack_size = (%d)" % tss)
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self.next_ident = 0
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self.created = 0
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for i in range(NUMTASKS):
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self.newtask()
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verbose_print("waiting for all tasks to complete")
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self.done_mutex.acquire()
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verbose_print("all tasks done")
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thread.stack_size(0)
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def test__count(self):
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# Test the _count() function.
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orig = thread._count()
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mut = thread.allocate_lock()
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mut.acquire()
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started = []
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def task():
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started.append(None)
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mut.acquire()
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mut.release()
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thread.start_new_thread(task, ())
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while not started:
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time.sleep(0.01)
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self.assertEqual(thread._count(), orig + 1)
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# Allow the task to finish.
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mut.release()
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# The only reliable way to be sure that the thread ended from the
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# interpreter's point of view is to wait for the function object to be
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# destroyed.
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done = []
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wr = weakref.ref(task, lambda _: done.append(None))
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del task
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while not done:
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time.sleep(0.01)
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self.assertEqual(thread._count(), orig)
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def test_save_exception_state_on_error(self):
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# See issue #14474
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def task():
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started.release()
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raise SyntaxError
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def mywrite(self, *args):
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try:
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raise ValueError
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except ValueError:
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pass
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real_write(self, *args)
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c = thread._count()
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started = thread.allocate_lock()
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with support.captured_output("stderr") as stderr:
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real_write = stderr.write
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stderr.write = mywrite
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started.acquire()
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thread.start_new_thread(task, ())
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started.acquire()
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while thread._count() > c:
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time.sleep(0.01)
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self.assertIn("Traceback", stderr.getvalue())
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class Barrier:
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def __init__(self, num_threads):
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self.num_threads = num_threads
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self.waiting = 0
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self.checkin_mutex = thread.allocate_lock()
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self.checkout_mutex = thread.allocate_lock()
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self.checkout_mutex.acquire()
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def enter(self):
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self.checkin_mutex.acquire()
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self.waiting = self.waiting + 1
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if self.waiting == self.num_threads:
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self.waiting = self.num_threads - 1
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self.checkout_mutex.release()
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return
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self.checkin_mutex.release()
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self.checkout_mutex.acquire()
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self.waiting = self.waiting - 1
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if self.waiting == 0:
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self.checkin_mutex.release()
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return
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self.checkout_mutex.release()
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class BarrierTest(BasicThreadTest):
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def test_barrier(self):
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self.bar = Barrier(NUMTASKS)
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self.running = NUMTASKS
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for i in range(NUMTASKS):
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thread.start_new_thread(self.task2, (i,))
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verbose_print("waiting for tasks to end")
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self.done_mutex.acquire()
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verbose_print("tasks done")
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def task2(self, ident):
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for i in range(NUMTRIPS):
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if ident == 0:
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# give it a good chance to enter the next
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# barrier before the others are all out
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# of the current one
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delay = 0
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else:
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with self.random_mutex:
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delay = random.random() / 10000.0
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verbose_print("task %s will run for %sus" %
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(ident, round(delay * 1e6)))
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time.sleep(delay)
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verbose_print("task %s entering %s" % (ident, i))
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self.bar.enter()
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verbose_print("task %s leaving barrier" % ident)
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with self.running_mutex:
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self.running -= 1
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# Must release mutex before releasing done, else the main thread can
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# exit and set mutex to None as part of global teardown; then
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# mutex.release() raises AttributeError.
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finished = self.running == 0
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if finished:
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self.done_mutex.release()
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class LockTests(lock_tests.LockTests):
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locktype = thread.allocate_lock
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class TestForkInThread(unittest.TestCase):
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def setUp(self):
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self.read_fd, self.write_fd = os.pipe()
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@unittest.skipIf(sys.platform.startswith('win'),
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"This test is only appropriate for POSIX-like systems.")
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@support.reap_threads
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def test_forkinthread(self):
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def thread1():
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try:
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pid = os.fork() # fork in a thread
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except RuntimeError:
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os._exit(1) # exit the child
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if pid == 0: # child
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try:
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os.close(self.read_fd)
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os.write(self.write_fd, b"OK")
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finally:
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os._exit(0)
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else: # parent
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os.close(self.write_fd)
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pid, status = os.waitpid(pid, 0)
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self.assertEqual(status, 0)
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thread.start_new_thread(thread1, ())
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self.assertEqual(os.read(self.read_fd, 2), b"OK",
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"Unable to fork() in thread")
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def tearDown(self):
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try:
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os.close(self.read_fd)
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except OSError:
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pass
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try:
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os.close(self.write_fd)
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except OSError:
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pass
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if __name__ == "__main__":
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unittest.main()
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