551 lines
15 KiB
Python
551 lines
15 KiB
Python
"""
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Various tests for synchronization primitives.
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"""
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import sys
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import time
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from thread import start_new_thread, get_ident
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import threading
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import unittest
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from test import test_support as support
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def _wait():
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# A crude wait/yield function not relying on synchronization primitives.
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time.sleep(0.01)
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class Bunch(object):
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"""
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A bunch of threads.
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"""
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def __init__(self, f, n, wait_before_exit=False):
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"""
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Construct a bunch of `n` threads running the same function `f`.
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If `wait_before_exit` is True, the threads won't terminate until
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do_finish() is called.
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"""
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self.f = f
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self.n = n
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self.started = []
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self.finished = []
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self._can_exit = not wait_before_exit
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def task():
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tid = get_ident()
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self.started.append(tid)
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try:
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f()
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finally:
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self.finished.append(tid)
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while not self._can_exit:
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_wait()
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try:
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for i in range(n):
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start_new_thread(task, ())
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except:
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self._can_exit = True
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raise
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def wait_for_started(self):
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while len(self.started) < self.n:
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_wait()
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def wait_for_finished(self):
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while len(self.finished) < self.n:
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_wait()
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def do_finish(self):
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self._can_exit = True
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class BaseTestCase(unittest.TestCase):
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def setUp(self):
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self._threads = support.threading_setup()
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def tearDown(self):
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support.threading_cleanup(*self._threads)
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support.reap_children()
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class BaseLockTests(BaseTestCase):
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"""
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Tests for both recursive and non-recursive locks.
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"""
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def test_constructor(self):
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lock = self.locktype()
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del lock
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def test_acquire_destroy(self):
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lock = self.locktype()
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lock.acquire()
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del lock
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def test_acquire_release(self):
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lock = self.locktype()
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lock.acquire()
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lock.release()
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del lock
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def test_try_acquire(self):
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lock = self.locktype()
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self.assertTrue(lock.acquire(False))
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lock.release()
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def test_try_acquire_contended(self):
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lock = self.locktype()
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lock.acquire()
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result = []
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def f():
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result.append(lock.acquire(False))
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Bunch(f, 1).wait_for_finished()
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self.assertFalse(result[0])
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lock.release()
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def test_acquire_contended(self):
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lock = self.locktype()
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lock.acquire()
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N = 5
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def f():
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lock.acquire()
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lock.release()
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b = Bunch(f, N)
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b.wait_for_started()
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_wait()
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self.assertEqual(len(b.finished), 0)
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lock.release()
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b.wait_for_finished()
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self.assertEqual(len(b.finished), N)
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def test_with(self):
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lock = self.locktype()
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def f():
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lock.acquire()
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lock.release()
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def _with(err=None):
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with lock:
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if err is not None:
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raise err
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_with()
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# Check the lock is unacquired
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Bunch(f, 1).wait_for_finished()
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self.assertRaises(TypeError, _with, TypeError)
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# Check the lock is unacquired
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Bunch(f, 1).wait_for_finished()
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def test_thread_leak(self):
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# The lock shouldn't leak a Thread instance when used from a foreign
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# (non-threading) thread.
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lock = self.locktype()
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def f():
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lock.acquire()
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lock.release()
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n = len(threading.enumerate())
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# We run many threads in the hope that existing threads ids won't
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# be recycled.
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Bunch(f, 15).wait_for_finished()
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self.assertEqual(n, len(threading.enumerate()))
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class LockTests(BaseLockTests):
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"""
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Tests for non-recursive, weak locks
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(which can be acquired and released from different threads).
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"""
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def test_reacquire(self):
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# Lock needs to be released before re-acquiring.
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lock = self.locktype()
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phase = []
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def f():
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lock.acquire()
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phase.append(None)
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lock.acquire()
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phase.append(None)
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start_new_thread(f, ())
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while len(phase) == 0:
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_wait()
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_wait()
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self.assertEqual(len(phase), 1)
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lock.release()
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while len(phase) == 1:
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_wait()
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self.assertEqual(len(phase), 2)
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def test_different_thread(self):
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# Lock can be released from a different thread.
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lock = self.locktype()
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lock.acquire()
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def f():
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lock.release()
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b = Bunch(f, 1)
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b.wait_for_finished()
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lock.acquire()
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lock.release()
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class RLockTests(BaseLockTests):
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"""
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Tests for recursive locks.
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"""
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def test_reacquire(self):
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lock = self.locktype()
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lock.acquire()
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lock.acquire()
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lock.release()
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lock.acquire()
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lock.release()
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lock.release()
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def test_release_unacquired(self):
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# Cannot release an unacquired lock
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lock = self.locktype()
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self.assertRaises(RuntimeError, lock.release)
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lock.acquire()
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lock.acquire()
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lock.release()
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lock.acquire()
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lock.release()
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lock.release()
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self.assertRaises(RuntimeError, lock.release)
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def test_different_thread(self):
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# Cannot release from a different thread
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lock = self.locktype()
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def f():
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lock.acquire()
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b = Bunch(f, 1, True)
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try:
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self.assertRaises(RuntimeError, lock.release)
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finally:
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b.do_finish()
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def test__is_owned(self):
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lock = self.locktype()
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self.assertFalse(lock._is_owned())
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lock.acquire()
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self.assertTrue(lock._is_owned())
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lock.acquire()
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self.assertTrue(lock._is_owned())
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result = []
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def f():
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result.append(lock._is_owned())
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Bunch(f, 1).wait_for_finished()
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self.assertFalse(result[0])
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lock.release()
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self.assertTrue(lock._is_owned())
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lock.release()
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self.assertFalse(lock._is_owned())
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class EventTests(BaseTestCase):
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"""
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Tests for Event objects.
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"""
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def test_is_set(self):
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evt = self.eventtype()
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self.assertFalse(evt.is_set())
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evt.set()
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self.assertTrue(evt.is_set())
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evt.set()
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self.assertTrue(evt.is_set())
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evt.clear()
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self.assertFalse(evt.is_set())
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evt.clear()
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self.assertFalse(evt.is_set())
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def _check_notify(self, evt):
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# All threads get notified
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N = 5
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results1 = []
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results2 = []
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def f():
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results1.append(evt.wait())
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results2.append(evt.wait())
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b = Bunch(f, N)
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b.wait_for_started()
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_wait()
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self.assertEqual(len(results1), 0)
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evt.set()
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b.wait_for_finished()
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self.assertEqual(results1, [True] * N)
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self.assertEqual(results2, [True] * N)
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def test_notify(self):
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evt = self.eventtype()
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self._check_notify(evt)
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# Another time, after an explicit clear()
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evt.set()
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evt.clear()
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self._check_notify(evt)
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def test_timeout(self):
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evt = self.eventtype()
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results1 = []
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results2 = []
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N = 5
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def f():
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results1.append(evt.wait(0.0))
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t1 = time.time()
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r = evt.wait(0.2)
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t2 = time.time()
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results2.append((r, t2 - t1))
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Bunch(f, N).wait_for_finished()
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self.assertEqual(results1, [False] * N)
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for r, dt in results2:
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self.assertFalse(r)
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self.assertTrue(dt >= 0.2, dt)
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# The event is set
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results1 = []
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results2 = []
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evt.set()
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Bunch(f, N).wait_for_finished()
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self.assertEqual(results1, [True] * N)
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for r, dt in results2:
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self.assertTrue(r)
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class ConditionTests(BaseTestCase):
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"""
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Tests for condition variables.
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"""
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def test_acquire(self):
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cond = self.condtype()
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# Be default we have an RLock: the condition can be acquired multiple
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# times.
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cond.acquire()
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cond.acquire()
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cond.release()
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cond.release()
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lock = threading.Lock()
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cond = self.condtype(lock)
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cond.acquire()
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self.assertFalse(lock.acquire(False))
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cond.release()
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self.assertTrue(lock.acquire(False))
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self.assertFalse(cond.acquire(False))
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lock.release()
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with cond:
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self.assertFalse(lock.acquire(False))
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def test_unacquired_wait(self):
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cond = self.condtype()
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self.assertRaises(RuntimeError, cond.wait)
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def test_unacquired_notify(self):
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cond = self.condtype()
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self.assertRaises(RuntimeError, cond.notify)
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def _check_notify(self, cond):
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N = 5
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results1 = []
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results2 = []
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phase_num = 0
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def f():
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cond.acquire()
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cond.wait()
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cond.release()
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results1.append(phase_num)
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cond.acquire()
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cond.wait()
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cond.release()
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results2.append(phase_num)
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b = Bunch(f, N)
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b.wait_for_started()
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_wait()
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self.assertEqual(results1, [])
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# Notify 3 threads at first
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cond.acquire()
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cond.notify(3)
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_wait()
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phase_num = 1
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cond.release()
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while len(results1) < 3:
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_wait()
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self.assertEqual(results1, [1] * 3)
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self.assertEqual(results2, [])
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# Notify 5 threads: they might be in their first or second wait
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cond.acquire()
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cond.notify(5)
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_wait()
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phase_num = 2
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cond.release()
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while len(results1) + len(results2) < 8:
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_wait()
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self.assertEqual(results1, [1] * 3 + [2] * 2)
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self.assertEqual(results2, [2] * 3)
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# Notify all threads: they are all in their second wait
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cond.acquire()
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cond.notify_all()
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_wait()
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phase_num = 3
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cond.release()
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while len(results2) < 5:
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_wait()
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self.assertEqual(results1, [1] * 3 + [2] * 2)
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self.assertEqual(results2, [2] * 3 + [3] * 2)
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b.wait_for_finished()
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def test_notify(self):
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cond = self.condtype()
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self._check_notify(cond)
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# A second time, to check internal state is still ok.
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self._check_notify(cond)
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def test_timeout(self):
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cond = self.condtype()
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results = []
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N = 5
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def f():
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cond.acquire()
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t1 = time.time()
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cond.wait(0.2)
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t2 = time.time()
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cond.release()
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results.append(t2 - t1)
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Bunch(f, N).wait_for_finished()
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self.assertEqual(len(results), 5)
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for dt in results:
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self.assertTrue(dt >= 0.2, dt)
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class BaseSemaphoreTests(BaseTestCase):
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"""
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Common tests for {bounded, unbounded} semaphore objects.
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"""
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def test_constructor(self):
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self.assertRaises(ValueError, self.semtype, value = -1)
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self.assertRaises(ValueError, self.semtype, value = -sys.maxint)
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def test_acquire(self):
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sem = self.semtype(1)
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sem.acquire()
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sem.release()
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sem = self.semtype(2)
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sem.acquire()
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sem.acquire()
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sem.release()
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sem.release()
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def test_acquire_destroy(self):
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sem = self.semtype()
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sem.acquire()
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del sem
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def test_acquire_contended(self):
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sem = self.semtype(7)
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sem.acquire()
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N = 10
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results1 = []
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results2 = []
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phase_num = 0
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def f():
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sem.acquire()
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results1.append(phase_num)
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sem.acquire()
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results2.append(phase_num)
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b = Bunch(f, 10)
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b.wait_for_started()
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while len(results1) + len(results2) < 6:
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_wait()
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self.assertEqual(results1 + results2, [0] * 6)
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phase_num = 1
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for i in range(7):
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sem.release()
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while len(results1) + len(results2) < 13:
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_wait()
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self.assertEqual(sorted(results1 + results2), [0] * 6 + [1] * 7)
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phase_num = 2
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for i in range(6):
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sem.release()
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while len(results1) + len(results2) < 19:
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_wait()
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self.assertEqual(sorted(results1 + results2), [0] * 6 + [1] * 7 + [2] * 6)
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# The semaphore is still locked
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self.assertFalse(sem.acquire(False))
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# Final release, to let the last thread finish
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sem.release()
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b.wait_for_finished()
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def test_try_acquire(self):
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sem = self.semtype(2)
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self.assertTrue(sem.acquire(False))
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self.assertTrue(sem.acquire(False))
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self.assertFalse(sem.acquire(False))
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sem.release()
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self.assertTrue(sem.acquire(False))
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def test_try_acquire_contended(self):
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sem = self.semtype(4)
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sem.acquire()
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results = []
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def f():
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results.append(sem.acquire(False))
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results.append(sem.acquire(False))
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Bunch(f, 5).wait_for_finished()
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# There can be a thread switch between acquiring the semaphore and
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# appending the result, therefore results will not necessarily be
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# ordered.
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self.assertEqual(sorted(results), [False] * 7 + [True] * 3 )
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def test_default_value(self):
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# The default initial value is 1.
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sem = self.semtype()
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sem.acquire()
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def f():
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sem.acquire()
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sem.release()
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b = Bunch(f, 1)
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b.wait_for_started()
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_wait()
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self.assertFalse(b.finished)
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sem.release()
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b.wait_for_finished()
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def test_with(self):
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sem = self.semtype(2)
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def _with(err=None):
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with sem:
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self.assertTrue(sem.acquire(False))
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sem.release()
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with sem:
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self.assertFalse(sem.acquire(False))
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if err:
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raise err
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_with()
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self.assertTrue(sem.acquire(False))
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sem.release()
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self.assertRaises(TypeError, _with, TypeError)
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self.assertTrue(sem.acquire(False))
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sem.release()
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class SemaphoreTests(BaseSemaphoreTests):
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"""
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Tests for unbounded semaphores.
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"""
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def test_release_unacquired(self):
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# Unbounded releases are allowed and increment the semaphore's value
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sem = self.semtype(1)
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sem.release()
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sem.acquire()
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sem.acquire()
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sem.release()
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class BoundedSemaphoreTests(BaseSemaphoreTests):
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"""
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Tests for bounded semaphores.
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"""
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def test_release_unacquired(self):
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# Cannot go past the initial value
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sem = self.semtype()
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self.assertRaises(ValueError, sem.release)
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sem.acquire()
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sem.release()
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self.assertRaises(ValueError, sem.release)
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