cpython/Lib/test/test_threading.py
Christian Heimes bbe741dd1b Merged revisions 61981,61984-61987,61992-61993,61997-62000 via svnmerge from
svn+ssh://pythondev@svn.python.org/python/trunk

........
  r61981 | amaury.forgeotdarc | 2008-03-28 01:21:34 +0100 (Fri, 28 Mar 2008) | 2 lines

  test_future3.py is a regular test file, and should be part of the test suite
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  r61984 | jeffrey.yasskin | 2008-03-28 05:11:18 +0100 (Fri, 28 Mar 2008) | 6 lines

  Kill a race in test_threading in which the exception info in a thread finishing
  up after it was joined had a traceback pointing to that thread's (deleted)
  target attribute, while the test was trying to check that the target was
  destroyed. Big thanks to Antoine Pitrou for diagnosing the race and pointing
  out sys.exc_clear() to kill the exception early. This fixes issue 2496.
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  r61985 | neal.norwitz | 2008-03-28 05:41:34 +0100 (Fri, 28 Mar 2008) | 1 line

  Allow use of other ports so the test can pass if 9091 is in use
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  r61986 | jeffrey.yasskin | 2008-03-28 05:53:10 +0100 (Fri, 28 Mar 2008) | 2 lines

  Print more information the next time test_socket throws the wrong exception.
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  r61987 | neal.norwitz | 2008-03-28 05:58:51 +0100 (Fri, 28 Mar 2008) | 5 lines

  Revert r61969 which added casts to Py_CHARMASK to avoid compiler warnings.
  Rather than sprinkle casts throughout the code, change Py_CHARMASK to
  always cast it's result to an unsigned char.  This should ensure we
  do the right thing when accessing an array with the result.
........
  r61992 | neal.norwitz | 2008-03-28 06:34:59 +0100 (Fri, 28 Mar 2008) | 2 lines

  Fix compiler warning about finite() missing on Solaris.
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  r61993 | neal.norwitz | 2008-03-28 07:34:03 +0100 (Fri, 28 Mar 2008) | 11 lines

  Bug 1503: Get the test to pass on OSX.  This should make the test more
  reliable, but I'm not convinced it is the right solution.  We need
  to determine if this causes the test to hang on any platforms or do
  other bad things.

  Even if it gets the test to pass reliably, it might be that we want
  to fix this in socket.  The socket returned from accept() is different
  on different platforms (inheriting attributes or not) and we might
  want to ensure that the attributes (at least blocking) is the same
  across all platforms.
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  r61997 | neal.norwitz | 2008-03-28 08:36:31 +0100 (Fri, 28 Mar 2008) | 1 line

  Name the main method correctly so the test is run
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  r61998 | gregory.p.smith | 2008-03-28 09:00:44 +0100 (Fri, 28 Mar 2008) | 7 lines

  This patch moves some tests from test_urllib2_net to test_urllib2_localnet.
  The moved tests use a local server rather than going out to external servers.

  Accepts patch from issue2429.

  Contributed by Jerry Seutter & Michael Foord (fuzzyman) at PyCon 2008.
........
  r61999 | georg.brandl | 2008-03-28 09:06:56 +0100 (Fri, 28 Mar 2008) | 2 lines

  #2406: add examples to gzip docs.
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  r62000 | gregory.p.smith | 2008-03-28 09:32:09 +0100 (Fri, 28 Mar 2008) | 4 lines

  Accept patch issue2426 by Paul Kippes (kippesp).

  Adds sqlite3.Connection.iterdump to allow dumping of databases.
........
2008-03-28 10:53:29 +00:00

331 lines
11 KiB
Python

# Very rudimentary test of threading module
import test.test_support
from test.test_support import verbose
import random
import sys
import threading
import thread
import time
import unittest
import weakref
# 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', self.getName(), 'will run for', delay, 'sec')
with self.sema:
with self.mutex:
self.nrunning.inc()
if verbose:
print(self.nrunning.get(), 'tasks are running')
self.testcase.assert_(self.nrunning.get() <= 3)
time.sleep(delay)
if verbose:
print('task', self.getName(), 'done')
with self.mutex:
self.nrunning.dec()
self.testcase.assert_(self.nrunning.get() >= 0)
if verbose:
print('%s is finished. %d tasks are running' %
self.getName(), self.nrunning.get())
class ThreadTests(unittest.TestCase):
# 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)
t.start()
if verbose:
print('waiting for all tasks to complete')
for t in threads:
t.join(NUMTASKS)
self.assert_(not t.isAlive())
if verbose:
print('all tasks done')
self.assertEqual(numrunning.get(), 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:
if verbose:
print('platform does not support changing thread stack size')
return
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:
if verbose:
print('platform does not support changing thread stack size')
return
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):
# Acquiring an RLock forces an entry for the foreign
# thread to get made in the threading._active map.
r = threading.RLock()
r.acquire()
r.release()
mutex.release()
mutex = threading.Lock()
mutex.acquire()
tid = thread.start_new_thread(f, (mutex,))
# Wait for the thread to finish.
mutex.acquire()
self.assert_(tid in threading._active)
self.assert_(isinstance(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):
try:
import ctypes
except ImportError:
if verbose:
print("test_PyThreadState_SetAsyncExc can't import ctypes")
return # can't do anything
set_async_exc = ctypes.pythonapi.PyThreadState_SetAsyncExc
class AsyncExc(Exception):
pass
exception = ctypes.py_object(AsyncExc)
# `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 = thread.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.setDaemon(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")
worker_started.wait()
if verbose:
print(" verifying worker hasn't exited")
self.assert_(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.assert_(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_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.
try:
import ctypes
except ImportError:
if verbose:
print("test_finalize_with_runnning_thread can't import ctypes")
return # can't do anything
import subprocess
rc = subprocess.call([sys.executable, "-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_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.getcheckinterval()
try:
for i in range(1, 1000):
t = threading.Thread(target=lambda: None)
t.start()
t.join()
l = enum()
self.assertFalse(t in l,
"#1703448 triggered after %d trials: %s" % (i, l))
finally:
sys.setcheckinterval(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.assertEquals(None, 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.assertEquals(None, weak_raising_cyclic_object(),
msg=('%d references still around' %
sys.getrefcount(weak_raising_cyclic_object())))
class ThreadingExceptionTests(unittest.TestCase):
# 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_releasing_unacquired_rlock(self):
rlock = threading.RLock()
self.assertRaises(RuntimeError, rlock.release)
def test_waiting_on_unacquired_condition(self):
cond = threading.Condition()
self.assertRaises(RuntimeError, cond.wait)
def test_notify_on_unacquired_condition(self):
cond = threading.Condition()
self.assertRaises(RuntimeError, cond.notify)
def test_semaphore_with_negative_value(self):
self.assertRaises(ValueError, threading.Semaphore, value = -1)
self.assertRaises(ValueError, threading.Semaphore, value = -sys.maxsize)
def test_joining_current_thread(self):
currentThread = threading.currentThread()
self.assertRaises(RuntimeError, currentThread.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, thread.setDaemon, True)
def test_main():
test.test_support.run_unittest(ThreadTests,
ThreadingExceptionTests)
if __name__ == "__main__":
test_main()