| """ |
| Tests for the threading module. |
| """ |
| |
| import test.support |
| from test.support import verbose, strip_python_stderr, import_module |
| from test.script_helper import assert_python_ok |
| |
| import random |
| import re |
| import sys |
| _thread = import_module('_thread') |
| threading = import_module('threading') |
| import _testcapi |
| import time |
| import unittest |
| import weakref |
| import os |
| from test.script_helper import assert_python_ok, assert_python_failure |
| import subprocess |
| |
| from test import lock_tests |
| |
| |
| # Between fork() and exec(), only async-safe functions are allowed (issues |
| # #12316 and #11870), and fork() from a worker thread is known to trigger |
| # problems with some operating systems (issue #3863): skip problematic tests |
| # on platforms known to behave badly. |
| platforms_to_skip = ('freebsd4', 'freebsd5', 'freebsd6', 'netbsd5', |
| 'hp-ux11') |
| |
| |
| # A trivial mutable counter. |
| class Counter(object): |
| def __init__(self): |
| self.value = 0 |
| def inc(self): |
| self.value += 1 |
| def dec(self): |
| self.value -= 1 |
| def get(self): |
| return self.value |
| |
| class TestThread(threading.Thread): |
| def __init__(self, name, testcase, sema, mutex, nrunning): |
| threading.Thread.__init__(self, name=name) |
| self.testcase = testcase |
| self.sema = sema |
| self.mutex = mutex |
| self.nrunning = nrunning |
| |
| def run(self): |
| delay = random.random() / 10000.0 |
| if verbose: |
| print('task %s will run for %.1f usec' % |
| (self.name, delay * 1e6)) |
| |
| with self.sema: |
| with self.mutex: |
| self.nrunning.inc() |
| if verbose: |
| print(self.nrunning.get(), 'tasks are running') |
| self.testcase.assertTrue(self.nrunning.get() <= 3) |
| |
| time.sleep(delay) |
| if verbose: |
| print('task', self.name, 'done') |
| |
| with self.mutex: |
| self.nrunning.dec() |
| self.testcase.assertTrue(self.nrunning.get() >= 0) |
| if verbose: |
| print('%s is finished. %d tasks are running' % |
| (self.name, self.nrunning.get())) |
| |
| |
| class BaseTestCase(unittest.TestCase): |
| def setUp(self): |
| self._threads = test.support.threading_setup() |
| |
| def tearDown(self): |
| test.support.threading_cleanup(*self._threads) |
| test.support.reap_children() |
| |
| |
| class ThreadTests(BaseTestCase): |
| |
| # Create a bunch of threads, let each do some work, wait until all are |
| # done. |
| def test_various_ops(self): |
| # This takes about n/3 seconds to run (about n/3 clumps of tasks, |
| # times about 1 second per clump). |
| NUMTASKS = 10 |
| |
| # no more than 3 of the 10 can run at once |
| sema = threading.BoundedSemaphore(value=3) |
| mutex = threading.RLock() |
| numrunning = Counter() |
| |
| threads = [] |
| |
| for i in range(NUMTASKS): |
| t = TestThread("<thread %d>"%i, self, sema, mutex, numrunning) |
| threads.append(t) |
| self.assertEqual(t.ident, None) |
| self.assertTrue(re.match('<TestThread\(.*, initial\)>', repr(t))) |
| t.start() |
| |
| if verbose: |
| print('waiting for all tasks to complete') |
| for t in threads: |
| t.join() |
| self.assertTrue(not t.is_alive()) |
| self.assertNotEqual(t.ident, 0) |
| self.assertFalse(t.ident is None) |
| self.assertTrue(re.match('<TestThread\(.*, stopped -?\d+\)>', |
| repr(t))) |
| if verbose: |
| print('all tasks done') |
| self.assertEqual(numrunning.get(), 0) |
| |
| def test_ident_of_no_threading_threads(self): |
| # The ident still must work for the main thread and dummy threads. |
| self.assertFalse(threading.currentThread().ident is None) |
| def f(): |
| ident.append(threading.currentThread().ident) |
| done.set() |
| done = threading.Event() |
| ident = [] |
| _thread.start_new_thread(f, ()) |
| done.wait() |
| self.assertFalse(ident[0] is None) |
| # Kill the "immortal" _DummyThread |
| del threading._active[ident[0]] |
| |
| # run with a small(ish) thread stack size (256kB) |
| def test_various_ops_small_stack(self): |
| if verbose: |
| print('with 256kB thread stack size...') |
| try: |
| threading.stack_size(262144) |
| except _thread.error: |
| raise unittest.SkipTest( |
| 'platform does not support changing thread stack size') |
| self.test_various_ops() |
| threading.stack_size(0) |
| |
| # run with a large thread stack size (1MB) |
| def test_various_ops_large_stack(self): |
| if verbose: |
| print('with 1MB thread stack size...') |
| try: |
| threading.stack_size(0x100000) |
| except _thread.error: |
| raise unittest.SkipTest( |
| 'platform does not support changing thread stack size') |
| self.test_various_ops() |
| threading.stack_size(0) |
| |
| def test_foreign_thread(self): |
| # Check that a "foreign" thread can use the threading module. |
| def f(mutex): |
| # Calling current_thread() forces an entry for the foreign |
| # thread to get made in the threading._active map. |
| threading.current_thread() |
| mutex.release() |
| |
| mutex = threading.Lock() |
| mutex.acquire() |
| tid = _thread.start_new_thread(f, (mutex,)) |
| # Wait for the thread to finish. |
| mutex.acquire() |
| self.assertIn(tid, threading._active) |
| self.assertIsInstance(threading._active[tid], threading._DummyThread) |
| del threading._active[tid] |
| |
| # PyThreadState_SetAsyncExc() is a CPython-only gimmick, not (currently) |
| # exposed at the Python level. This test relies on ctypes to get at it. |
| def test_PyThreadState_SetAsyncExc(self): |
| ctypes = import_module("ctypes") |
| |
| set_async_exc = ctypes.pythonapi.PyThreadState_SetAsyncExc |
| |
| class AsyncExc(Exception): |
| pass |
| |
| exception = ctypes.py_object(AsyncExc) |
| |
| # First check it works when setting the exception from the same thread. |
| tid = threading.get_ident() |
| |
| try: |
| result = set_async_exc(ctypes.c_long(tid), exception) |
| # The exception is async, so we might have to keep the VM busy until |
| # it notices. |
| while True: |
| pass |
| except AsyncExc: |
| pass |
| else: |
| # This code is unreachable but it reflects the intent. If we wanted |
| # to be smarter the above loop wouldn't be infinite. |
| self.fail("AsyncExc not raised") |
| try: |
| self.assertEqual(result, 1) # one thread state modified |
| except UnboundLocalError: |
| # The exception was raised too quickly for us to get the result. |
| pass |
| |
| # `worker_started` is set by the thread when it's inside a try/except |
| # block waiting to catch the asynchronously set AsyncExc exception. |
| # `worker_saw_exception` is set by the thread upon catching that |
| # exception. |
| worker_started = threading.Event() |
| worker_saw_exception = threading.Event() |
| |
| class Worker(threading.Thread): |
| def run(self): |
| self.id = threading.get_ident() |
| self.finished = False |
| |
| try: |
| while True: |
| worker_started.set() |
| time.sleep(0.1) |
| except AsyncExc: |
| self.finished = True |
| worker_saw_exception.set() |
| |
| t = Worker() |
| t.daemon = True # so if this fails, we don't hang Python at shutdown |
| t.start() |
| if verbose: |
| print(" started worker thread") |
| |
| # Try a thread id that doesn't make sense. |
| if verbose: |
| print(" trying nonsensical thread id") |
| result = set_async_exc(ctypes.c_long(-1), exception) |
| self.assertEqual(result, 0) # no thread states modified |
| |
| # Now raise an exception in the worker thread. |
| if verbose: |
| print(" waiting for worker thread to get started") |
| ret = worker_started.wait() |
| self.assertTrue(ret) |
| if verbose: |
| print(" verifying worker hasn't exited") |
| self.assertTrue(not t.finished) |
| if verbose: |
| print(" attempting to raise asynch exception in worker") |
| result = set_async_exc(ctypes.c_long(t.id), exception) |
| self.assertEqual(result, 1) # one thread state modified |
| if verbose: |
| print(" waiting for worker to say it caught the exception") |
| worker_saw_exception.wait(timeout=10) |
| self.assertTrue(t.finished) |
| if verbose: |
| print(" all OK -- joining worker") |
| if t.finished: |
| t.join() |
| # else the thread is still running, and we have no way to kill it |
| |
| def test_limbo_cleanup(self): |
| # Issue 7481: Failure to start thread should cleanup the limbo map. |
| def fail_new_thread(*args): |
| raise threading.ThreadError() |
| _start_new_thread = threading._start_new_thread |
| threading._start_new_thread = fail_new_thread |
| try: |
| t = threading.Thread(target=lambda: None) |
| self.assertRaises(threading.ThreadError, t.start) |
| self.assertFalse( |
| t in threading._limbo, |
| "Failed to cleanup _limbo map on failure of Thread.start().") |
| finally: |
| threading._start_new_thread = _start_new_thread |
| |
| def test_finalize_runnning_thread(self): |
| # Issue 1402: the PyGILState_Ensure / _Release functions may be called |
| # very late on python exit: on deallocation of a running thread for |
| # example. |
| import_module("ctypes") |
| |
| rc, out, err = assert_python_failure("-c", """if 1: |
| import ctypes, sys, time, _thread |
| |
| # This lock is used as a simple event variable. |
| ready = _thread.allocate_lock() |
| ready.acquire() |
| |
| # Module globals are cleared before __del__ is run |
| # So we save the functions in class dict |
| class C: |
| ensure = ctypes.pythonapi.PyGILState_Ensure |
| release = ctypes.pythonapi.PyGILState_Release |
| def __del__(self): |
| state = self.ensure() |
| self.release(state) |
| |
| def waitingThread(): |
| x = C() |
| ready.release() |
| time.sleep(100) |
| |
| _thread.start_new_thread(waitingThread, ()) |
| ready.acquire() # Be sure the other thread is waiting. |
| sys.exit(42) |
| """) |
| self.assertEqual(rc, 42) |
| |
| def test_finalize_with_trace(self): |
| # Issue1733757 |
| # Avoid a deadlock when sys.settrace steps into threading._shutdown |
| assert_python_ok("-c", """if 1: |
| import sys, threading |
| |
| # A deadlock-killer, to prevent the |
| # testsuite to hang forever |
| def killer(): |
| import os, time |
| time.sleep(2) |
| print('program blocked; aborting') |
| os._exit(2) |
| t = threading.Thread(target=killer) |
| t.daemon = True |
| t.start() |
| |
| # This is the trace function |
| def func(frame, event, arg): |
| threading.current_thread() |
| return func |
| |
| sys.settrace(func) |
| """) |
| |
| def test_join_nondaemon_on_shutdown(self): |
| # Issue 1722344 |
| # Raising SystemExit skipped threading._shutdown |
| rc, out, err = assert_python_ok("-c", """if 1: |
| import threading |
| from time import sleep |
| |
| def child(): |
| sleep(1) |
| # As a non-daemon thread we SHOULD wake up and nothing |
| # should be torn down yet |
| print("Woke up, sleep function is:", sleep) |
| |
| threading.Thread(target=child).start() |
| raise SystemExit |
| """) |
| self.assertEqual(out.strip(), |
| b"Woke up, sleep function is: <built-in function sleep>") |
| self.assertEqual(err, b"") |
| |
| def test_enumerate_after_join(self): |
| # Try hard to trigger #1703448: a thread is still returned in |
| # threading.enumerate() after it has been join()ed. |
| enum = threading.enumerate |
| old_interval = sys.getswitchinterval() |
| try: |
| for i in range(1, 100): |
| sys.setswitchinterval(i * 0.0002) |
| t = threading.Thread(target=lambda: None) |
| t.start() |
| t.join() |
| l = enum() |
| self.assertNotIn(t, l, |
| "#1703448 triggered after %d trials: %s" % (i, l)) |
| finally: |
| sys.setswitchinterval(old_interval) |
| |
| def test_no_refcycle_through_target(self): |
| class RunSelfFunction(object): |
| def __init__(self, should_raise): |
| # The links in this refcycle from Thread back to self |
| # should be cleaned up when the thread completes. |
| self.should_raise = should_raise |
| self.thread = threading.Thread(target=self._run, |
| args=(self,), |
| kwargs={'yet_another':self}) |
| self.thread.start() |
| |
| def _run(self, other_ref, yet_another): |
| if self.should_raise: |
| raise SystemExit |
| |
| cyclic_object = RunSelfFunction(should_raise=False) |
| weak_cyclic_object = weakref.ref(cyclic_object) |
| cyclic_object.thread.join() |
| del cyclic_object |
| self.assertIsNone(weak_cyclic_object(), |
| msg=('%d references still around' % |
| sys.getrefcount(weak_cyclic_object()))) |
| |
| raising_cyclic_object = RunSelfFunction(should_raise=True) |
| weak_raising_cyclic_object = weakref.ref(raising_cyclic_object) |
| raising_cyclic_object.thread.join() |
| del raising_cyclic_object |
| self.assertIsNone(weak_raising_cyclic_object(), |
| msg=('%d references still around' % |
| sys.getrefcount(weak_raising_cyclic_object()))) |
| |
| def test_old_threading_api(self): |
| # Just a quick sanity check to make sure the old method names are |
| # still present |
| t = threading.Thread() |
| t.isDaemon() |
| t.setDaemon(True) |
| t.getName() |
| t.setName("name") |
| t.isAlive() |
| e = threading.Event() |
| e.isSet() |
| threading.activeCount() |
| |
| def test_repr_daemon(self): |
| t = threading.Thread() |
| self.assertFalse('daemon' in repr(t)) |
| t.daemon = True |
| self.assertTrue('daemon' in repr(t)) |
| |
| def test_deamon_param(self): |
| t = threading.Thread() |
| self.assertFalse(t.daemon) |
| t = threading.Thread(daemon=False) |
| self.assertFalse(t.daemon) |
| t = threading.Thread(daemon=True) |
| self.assertTrue(t.daemon) |
| |
| @unittest.skipUnless(hasattr(os, 'fork'), 'test needs fork()') |
| def test_dummy_thread_after_fork(self): |
| # Issue #14308: a dummy thread in the active list doesn't mess up |
| # the after-fork mechanism. |
| code = """if 1: |
| import _thread, threading, os, time |
| |
| def background_thread(evt): |
| # Creates and registers the _DummyThread instance |
| threading.current_thread() |
| evt.set() |
| time.sleep(10) |
| |
| evt = threading.Event() |
| _thread.start_new_thread(background_thread, (evt,)) |
| evt.wait() |
| assert threading.active_count() == 2, threading.active_count() |
| if os.fork() == 0: |
| assert threading.active_count() == 1, threading.active_count() |
| os._exit(0) |
| else: |
| os.wait() |
| """ |
| _, out, err = assert_python_ok("-c", code) |
| self.assertEqual(out, b'') |
| self.assertEqual(err, b'') |
| |
| @unittest.skipUnless(hasattr(os, 'fork'), "needs os.fork()") |
| def test_is_alive_after_fork(self): |
| # Try hard to trigger #18418: is_alive() could sometimes be True on |
| # threads that vanished after a fork. |
| old_interval = sys.getswitchinterval() |
| self.addCleanup(sys.setswitchinterval, old_interval) |
| |
| # Make the bug more likely to manifest. |
| sys.setswitchinterval(1e-6) |
| |
| for i in range(20): |
| t = threading.Thread(target=lambda: None) |
| t.start() |
| self.addCleanup(t.join) |
| pid = os.fork() |
| if pid == 0: |
| os._exit(1 if t.is_alive() else 0) |
| else: |
| pid, status = os.waitpid(pid, 0) |
| self.assertEqual(0, status) |
| |
| def test_main_thread(self): |
| main = threading.main_thread() |
| self.assertEqual(main.name, 'MainThread') |
| self.assertEqual(main.ident, threading.current_thread().ident) |
| self.assertEqual(main.ident, threading.get_ident()) |
| |
| def f(): |
| self.assertNotEqual(threading.main_thread().ident, |
| threading.current_thread().ident) |
| th = threading.Thread(target=f) |
| th.start() |
| th.join() |
| |
| @unittest.skipUnless(hasattr(os, 'fork'), "test needs os.fork()") |
| @unittest.skipUnless(hasattr(os, 'waitpid'), "test needs os.waitpid()") |
| def test_main_thread_after_fork(self): |
| code = """if 1: |
| import os, threading |
| |
| 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()) |
| 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") |
| |
| 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.assertTrue(t._tstate_lock is None) |
| |
| 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 |
| |
| 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) |
| |
| def test_locals_at_exit(self): |
| # Issue #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 = "atexit" |
| |
| atexit = Atexit() |
| """) |
| self.assertEqual(out.rstrip(), b"thread_dict.atexit = 'atexit'") |
| |
| def test_warnings_at_exit(self): |
| # Issue #19466: try to call most destructors at Python shutdown before |
| # destroying Python thread states |
| filename = __file__ |
| rc, out, err = assert_python_ok("-Wd", "-c", """if 1: |
| import time |
| import threading |
| |
| def open_sleep(): |
| # a warning will be emitted when the open file will be |
| # destroyed (without being explicitly closed) while the daemon |
| # thread is destroyed |
| fileobj = open(%a, 'rb') |
| start_event.set() |
| time.sleep(60.0) |
| |
| start_event = threading.Event() |
| |
| thread = threading.Thread(target=open_sleep) |
| thread.daemon = True |
| thread.start() |
| |
| # wait until the thread started |
| start_event.wait() |
| """ % filename) |
| self.assertRegex(err.rstrip(), |
| b"^sys:1: ResourceWarning: unclosed file ") |
| |
| |
| 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 |
| import warnings |
| |
| # ignore "unclosed file ..." warnings |
| warnings.filterwarnings('ignore', '', ResourceWarning) |
| |
| thread_has_run = set() |
| |
| def random_io(): |
| '''Loop for a while sleeping random tiny amounts and doing some I/O.''' |
| while True: |
| in_f = open(os.__file__, 'rb') |
| stuff = in_f.read(200) |
| null_f = open(os.devnull, 'wb') |
| null_f.write(stuff) |
| time.sleep(random.random() / 1995) |
| null_f.close() |
| in_f.close() |
| 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 test_threads_join(self): |
| # Non-daemon threads should be joined at subinterpreter shutdown |
| # (issue #18808) |
| r, w = os.pipe() |
| self.addCleanup(os.close, r) |
| self.addCleanup(os.close, w) |
| code = r"""if 1: |
| import os |
| import threading |
| import time |
| |
| def f(): |
| # Sleep a bit so that the thread is still running when |
| # Py_EndInterpreter is called. |
| time.sleep(0.05) |
| os.write(%d, b"x") |
| threading.Thread(target=f).start() |
| """ % (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 = os.pipe() |
| self.addCleanup(os.close, r) |
| self.addCleanup(os.close, w) |
| code = r"""if 1: |
| import os |
| import threading |
| import time |
| |
| class Sleeper: |
| def __del__(self): |
| time.sleep(0.05) |
| |
| tls = threading.local() |
| |
| def f(): |
| # Sleep a bit so that the thread is still running when |
| # Py_EndInterpreter is called. |
| time.sleep(0.05) |
| tls.x = Sleeper() |
| os.write(%d, b"x") |
| threading.Thread(target=f).start() |
| """ % (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_threads_fatal_error(self): |
| subinterp_code = r"""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(10) |
| 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) |
| |
| 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) |
| |
| def test_releasing_unacquired_lock(self): |
| lock = threading.Lock() |
| self.assertRaises(RuntimeError, lock.release) |
| |
| @unittest.skipUnless(sys.platform == 'darwin' and test.support.python_is_optimized(), |
| 'test macosx problem') |
| 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 RuntimeError: |
| 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) |
| |
| 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, [((), {}), ((), {})]) |
| |
| 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): |
| # An Condition uses an RLock by default and exports its API. |
| locktype = staticmethod(threading.Condition) |
| |
| class ConditionTests(lock_tests.ConditionTests): |
| condtype = staticmethod(threading.Condition) |
| |
| class SemaphoreTests(lock_tests.SemaphoreTests): |
| semtype = staticmethod(threading.Semaphore) |
| |
| class BoundedSemaphoreTests(lock_tests.BoundedSemaphoreTests): |
| semtype = staticmethod(threading.BoundedSemaphore) |
| |
| class BarrierTests(lock_tests.BarrierTests): |
| barriertype = staticmethod(threading.Barrier) |
| |
| if __name__ == "__main__": |
| unittest.main() |