mirror of
https://github.com/python/cpython.git
synced 2025-07-08 03:45:36 +00:00
1a057bab0f
This changeset increases the default size of the stack for threads on macOS to the size of the stack of the main thread and reenables the relevant recursion test.
1389 lines
48 KiB
Python
1389 lines
48 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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requires_type_collecting)
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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=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_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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with self.assertWarnsRegex(DeprecationWarning, 'use is_alive()'):
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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.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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pid, status = os.waitpid(pid, 0)
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self.assertTrue(os.WIFEXITED(status))
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self.assertEqual(10, os.WEXITSTATUS(status))
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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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pid = os.fork()
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if pid == 0:
|
|
main = threading.main_thread()
|
|
print(main.name)
|
|
print(main.ident == threading.current_thread().ident)
|
|
print(main.ident == threading.get_ident())
|
|
else:
|
|
os.waitpid(pid, 0)
|
|
"""
|
|
_, 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
|
|
|
|
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:
|
|
os.waitpid(pid, 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")
|
|
|
|
@requires_type_collecting
|
|
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=5), 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)
|
|
|
|
|
|
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:
|
|
childpid = os.fork()
|
|
if childpid != 0:
|
|
os.waitpid(childpid, 0)
|
|
sys.exit(0)
|
|
|
|
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:
|
|
main_thread = threading.current_thread()
|
|
def worker():
|
|
childpid = os.fork()
|
|
if childpid != 0:
|
|
os.waitpid(childpid, 0)
|
|
sys.exit(0)
|
|
|
|
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:
|
|
os.waitpid(pid, 0)
|
|
else:
|
|
os._exit(0)
|
|
|
|
# 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(0)
|
|
else:
|
|
os._exit(1)
|
|
else:
|
|
_, status = os.waitpid(pid, 0)
|
|
self.assertEqual(0, status)
|
|
|
|
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")
|
|
|
|
def test_daemon_thread(self):
|
|
r, w = self.pipe()
|
|
code = textwrap.dedent(f"""
|
|
import threading
|
|
import sys
|
|
|
|
channel = open({w}, "w", closefd=False)
|
|
|
|
def func():
|
|
pass
|
|
|
|
thread = threading.Thread(target=func, daemon=True)
|
|
try:
|
|
thread.start()
|
|
except RuntimeError as exc:
|
|
print("ok: %s" % exc, file=channel, flush=True)
|
|
else:
|
|
thread.join()
|
|
print("fail: RuntimeError not raised", file=channel, flush=True)
|
|
""")
|
|
ret = test.support.run_in_subinterp(code)
|
|
self.assertEqual(ret, 0)
|
|
|
|
msg = os.read(r, 100).decode().rstrip()
|
|
self.assertEqual("ok: daemon thread are not supported "
|
|
"in subinterpreters", msg)
|
|
|
|
|
|
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)
|
|
|
|
@requires_type_collecting
|
|
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)
|
|
|
|
|
|
if __name__ == "__main__":
|
|
unittest.main()
|