mirror of
https://github.com/python/cpython.git
synced 2025-11-03 23:21:29 +00:00
1454 lines
50 KiB
Python
1454 lines
50 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 verbose, import_module, cpython_only
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from test.support.script_helper import assert_python_ok, assert_python_failure
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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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from test import lock_tests
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from test import support
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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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# 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 = 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.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.currentThread().ident)
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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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with support.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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# 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 (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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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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with support.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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self.assertIn(tid, threading._active)
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self.assertIsInstance(threading._active[tid], threading._DummyThread)
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#Issue 29376
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self.assertTrue(threading._active[tid].is_alive())
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self.assertRegex(repr(threading._active[tid]), '_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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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):
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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_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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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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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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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()
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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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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.assertNotIn('daemon', repr(t))
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t.daemon = True
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self.assertIn('daemon', repr(t))
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def test_daemon_param(self):
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t = threading.Thread()
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self.assertFalse(t.daemon)
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t = threading.Thread(daemon=False)
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self.assertFalse(t.daemon)
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t = threading.Thread(daemon=True)
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self.assertTrue(t.daemon)
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@unittest.skipUnless(hasattr(os, 'fork'), 'test needs fork()')
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def test_dummy_thread_after_fork(self):
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# Issue #14308: a dummy thread in the active list doesn't mess up
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# the after-fork mechanism.
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code = """if 1:
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import _thread, threading, os, time
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def background_thread(evt):
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# Creates and registers the _DummyThread instance
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threading.current_thread()
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evt.set()
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time.sleep(10)
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evt = threading.Event()
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_thread.start_new_thread(background_thread, (evt,))
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evt.wait()
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assert threading.active_count() == 2, threading.active_count()
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if os.fork() == 0:
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assert threading.active_count() == 1, threading.active_count()
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os._exit(0)
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else:
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os.wait()
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"""
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_, out, err = assert_python_ok("-c", code)
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self.assertEqual(out, b'')
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self.assertEqual(err, b'')
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@unittest.skipUnless(hasattr(os, 'fork'), "needs os.fork()")
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def test_is_alive_after_fork(self):
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# Try hard to trigger #18418: is_alive() could sometimes be True on
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# threads that vanished after a fork.
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old_interval = sys.getswitchinterval()
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self.addCleanup(sys.setswitchinterval, old_interval)
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# Make the bug more likely to manifest.
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test.support.setswitchinterval(1e-6)
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for i in range(20):
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t = threading.Thread(target=lambda: None)
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t.start()
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pid = os.fork()
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if pid == 0:
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os._exit(11 if t.is_alive() else 10)
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else:
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t.join()
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support.wait_process(pid, exitcode=10)
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def test_main_thread(self):
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main = threading.main_thread()
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self.assertEqual(main.name, 'MainThread')
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self.assertEqual(main.ident, threading.current_thread().ident)
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self.assertEqual(main.ident, threading.get_ident())
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def f():
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self.assertNotEqual(threading.main_thread().ident,
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threading.current_thread().ident)
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th = threading.Thread(target=f)
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th.start()
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th.join()
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@unittest.skipUnless(hasattr(os, 'fork'), "test needs os.fork()")
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@unittest.skipUnless(hasattr(os, 'waitpid'), "test needs os.waitpid()")
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def test_main_thread_after_fork(self):
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code = """if 1:
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import os, threading
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from test import support
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pid = os.fork()
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if pid == 0:
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main = threading.main_thread()
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print(main.name)
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print(main.ident == threading.current_thread().ident)
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print(main.ident == threading.get_ident())
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else:
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support.wait_process(pid, exitcode=0)
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"""
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_, out, err = assert_python_ok("-c", code)
|
|
data = out.decode().replace('\r', '')
|
|
self.assertEqual(err, b"")
|
|
self.assertEqual(data, "MainThread\nTrue\nTrue\n")
|
|
|
|
@unittest.skipIf(sys.platform in platforms_to_skip, "due to known OS bug")
|
|
@unittest.skipUnless(hasattr(os, 'fork'), "test needs os.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
|
|
from test import support
|
|
|
|
def f():
|
|
pid = os.fork()
|
|
if pid == 0:
|
|
main = threading.main_thread()
|
|
print(main.name)
|
|
print(main.ident == threading.current_thread().ident)
|
|
print(main.ident == threading.get_ident())
|
|
# stdout is fully buffered because not a tty,
|
|
# we have to flush before exit.
|
|
sys.stdout.flush()
|
|
else:
|
|
support.wait_process(pid, exitcode=0)
|
|
|
|
th = threading.Thread(target=f)
|
|
th.start()
|
|
th.join()
|
|
"""
|
|
_, out, err = assert_python_ok("-c", code)
|
|
data = out.decode().replace('\r', '')
|
|
self.assertEqual(err, b"")
|
|
self.assertEqual(data, "Thread-1\nTrue\nTrue\n")
|
|
|
|
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_tstate_lock(self):
|
|
# Test an implementation detail of Thread objects.
|
|
started = _thread.allocate_lock()
|
|
finish = _thread.allocate_lock()
|
|
started.acquire()
|
|
finish.acquire()
|
|
def f():
|
|
started.release()
|
|
finish.acquire()
|
|
time.sleep(0.01)
|
|
# The tstate lock is None until the thread is started
|
|
t = threading.Thread(target=f)
|
|
self.assertIs(t._tstate_lock, None)
|
|
t.start()
|
|
started.acquire()
|
|
self.assertTrue(t.is_alive())
|
|
# The tstate lock can't be acquired when the thread is running
|
|
# (or suspended).
|
|
tstate_lock = t._tstate_lock
|
|
self.assertFalse(tstate_lock.acquire(timeout=0), False)
|
|
finish.release()
|
|
# When the thread ends, the state_lock can be successfully
|
|
# acquired.
|
|
self.assertTrue(tstate_lock.acquire(timeout=support.SHORT_TIMEOUT), False)
|
|
# But is_alive() is still True: we hold _tstate_lock now, which
|
|
# prevents is_alive() from knowing the thread's end-of-life C code
|
|
# is done.
|
|
self.assertTrue(t.is_alive())
|
|
# Let is_alive() find out the C code is done.
|
|
tstate_lock.release()
|
|
self.assertFalse(t.is_alive())
|
|
# And verify the thread disposed of _tstate_lock.
|
|
self.assertIsNone(t._tstate_lock)
|
|
t.join()
|
|
|
|
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):
|
|
# 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
|
|
import _testcapi
|
|
_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)
|
|
|
|
@cpython_only
|
|
def test_shutdown_locks(self):
|
|
for daemon in (False, True):
|
|
with self.subTest(daemon=daemon):
|
|
event = threading.Event()
|
|
thread = threading.Thread(target=event.wait, daemon=daemon)
|
|
|
|
# Thread.start() must add lock to _shutdown_locks,
|
|
# but only for non-daemon thread
|
|
thread.start()
|
|
tstate_lock = thread._tstate_lock
|
|
if not daemon:
|
|
self.assertIn(tstate_lock, threading._shutdown_locks)
|
|
else:
|
|
self.assertNotIn(tstate_lock, threading._shutdown_locks)
|
|
|
|
# unblock the thread and join it
|
|
event.set()
|
|
thread.join()
|
|
|
|
# Thread._stop() must remove tstate_lock from _shutdown_locks.
|
|
# Daemon threads must never add it to _shutdown_locks.
|
|
self.assertNotIn(tstate_lock, threading._shutdown_locks)
|
|
|
|
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'")
|
|
|
|
|
|
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)
|
|
|
|
@unittest.skipUnless(hasattr(os, 'fork'), "needs os.fork()")
|
|
@unittest.skipIf(sys.platform in platforms_to_skip, "due to known OS bug")
|
|
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)
|
|
|
|
@unittest.skipUnless(hasattr(os, 'fork'), "needs os.fork()")
|
|
@unittest.skipIf(sys.platform in platforms_to_skip, "due to known OS bug")
|
|
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.
|
|
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.'''
|
|
while True:
|
|
with open(os.__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)
|
|
|
|
@unittest.skipUnless(hasattr(os, 'fork'), "needs os.fork()")
|
|
@unittest.skipIf(sys.platform in platforms_to_skip, "due to known OS bug")
|
|
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)
|
|
|
|
# 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()
|
|
|
|
@unittest.skipUnless(hasattr(os, 'fork'), "needs os.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()
|
|
|
|
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)
|
|
|
|
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")
|
|
|
|
@cpython_only
|
|
def test_daemon_threads_fatal_error(self):
|
|
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())
|
|
|
|
|
|
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)
|
|
|
|
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_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
|
|
|
|
|
|
class ThreadRunFail(threading.Thread):
|
|
def run(self):
|
|
raise ValueError("run failed")
|
|
|
|
|
|
class ExceptHookTests(BaseTestCase):
|
|
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
|
|
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')
|
|
|
|
|
|
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)
|
|
|
|
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)
|
|
|
|
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):
|
|
extra = {"ThreadError"}
|
|
blacklist = {'currentThread', 'activeCount'}
|
|
support.check__all__(self, threading, ('threading', '_thread'),
|
|
extra=extra, blacklist=blacklist)
|
|
|
|
|
|
class InterruptMainTests(unittest.TestCase):
|
|
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_noerror(self):
|
|
handler = signal.getsignal(signal.SIGINT)
|
|
try:
|
|
# No exception should arise.
|
|
signal.signal(signal.SIGINT, signal.SIG_IGN)
|
|
_thread.interrupt_main()
|
|
|
|
signal.signal(signal.SIGINT, signal.SIG_DFL)
|
|
_thread.interrupt_main()
|
|
finally:
|
|
# Restore original handler
|
|
signal.signal(signal.SIGINT, handler)
|
|
|
|
|
|
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()
|