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test_threading.test_foreign_thread(): new test does a basic check that "foreign" threads can using the threading module, and that they create a _DummyThread instance in at least one use case. This isn't a very good test, since a thread created by thread.start_new_thread() isn't particularly "foreign".
112 lines
3.2 KiB
Python
112 lines
3.2 KiB
Python
# Very rudimentary test of threading module
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import test.test_support
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from test.test_support import verbose
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import random
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import threading
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import thread
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import time
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import unittest
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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() * 2
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if verbose:
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print 'task', self.getName(), 'will run for', delay, 'sec'
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self.sema.acquire()
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self.mutex.acquire()
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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.assert_(self.nrunning.get() <= 3)
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self.mutex.release()
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time.sleep(delay)
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if verbose:
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print 'task', self.getName(), 'done'
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self.mutex.acquire()
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self.nrunning.dec()
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self.testcase.assert_(self.nrunning.get() >= 0)
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if verbose:
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print self.getName(), 'is finished.', self.nrunning.get(), \
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'tasks are running'
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self.mutex.release()
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self.sema.release()
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class ThreadTests(unittest.TestCase):
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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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t.start()
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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(NUMTASKS)
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self.assert_(not t.isAlive())
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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_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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# Acquiring an RLock forces an entry for the foreign
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# thread to get made in the threading._active map.
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r = threading.RLock()
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r.acquire()
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r.release()
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mutex.release()
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mutex = threading.Lock()
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mutex.acquire()
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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.assert_(tid in threading._active)
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self.assert_(isinstance(threading._active[tid],
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threading._DummyThread))
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del threading._active[tid]
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def test_main():
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test.test_support.run_unittest(ThreadTests)
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if __name__ == "__main__":
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test_main()
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