lib-python.2.5.test.test_threading.py Maven / Gradle / Ivy
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Jython is an implementation of the high-level, dynamic, object-oriented
language Python written in 100% Pure Java, and seamlessly integrated with
the Java platform. It thus allows you to run Python on any Java platform.
# 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
# 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() * 2
if verbose:
print 'task', self.getName(), 'will run for', delay, 'sec'
self.sema.acquire()
self.mutex.acquire()
self.nrunning.inc()
if verbose:
print self.nrunning.get(), 'tasks are running'
self.testcase.assert_(self.nrunning.get() <= 3)
self.mutex.release()
time.sleep(delay)
if verbose:
print 'task', self.getName(), 'done'
self.mutex.acquire()
self.nrunning.dec()
self.testcase.assert_(self.nrunning.get() >= 0)
if verbose:
print self.getName(), 'is finished.', self.nrunning.get(), \
'tasks are running'
self.mutex.release()
self.sema.release()
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(""%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_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()
sys.setcheckinterval(1)
try:
for i in xrange(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)
class ThreadJoinOnShutdown(unittest.TestCase):
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'
\n""" + script
import subprocess
p = subprocess.Popen([sys.executable, "-c", script], stdout=subprocess.PIPE)
rc = p.wait()
data = p.stdout.read().replace('\r', '')
self.assertEqual(data, "end of main\nend of thread\n")
self.failIf(rc == 2, "interpreter was blocked")
self.failUnless(rc == 0, "Unexpected error")
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.currentThread(),))
t.start()
time.sleep(0.1)
print 'end of main'
"""
self._run_and_join(script)
def test_2_join_in_forked_process(self):
# Like the test above, but from a forked interpreter
import os
if not hasattr(os, 'fork'):
return
script = """if 1:
childpid = os.fork()
if childpid != 0:
os.waitpid(childpid, 0)
sys.exit(0)
t = threading.Thread(target=joiningfunc,
args=(threading.currentThread(),))
t.start()
print 'end of main'
"""
self._run_and_join(script)
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.
import os
if not hasattr(os, 'fork'):
return
# Skip platforms with known problems forking from a worker thread.
# See http://bugs.python.org/issue3863.
if sys.platform in ('freebsd4', 'freebsd5', 'freebsd6', 'os2emx'):
print >>sys.stderr, ('Skipping test_3_join_in_forked_from_thread'
' due to known OS bugs on'), sys.platform
return
script = """if 1:
main_thread = threading.currentThread()
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)
def test_main():
test.test_support.run_unittest(ThreadTests,
ThreadJoinOnShutdown)
if __name__ == "__main__":
test_main()