test_threadsignals.py 文件源码

def test_rlock_acquire_interruption(self):
        # Mimic receiving a SIGINT (KeyboardInterrupt) with SIGALRM while stuck
        # in a deadlock.
        # XXX this test can fail when the legacy (non-semaphore) implementation
        # of locks is used in thread_pthread.h, see issue #11223.
        oldalrm = signal.signal(signal.SIGALRM, self.alarm_interrupt)
        try:
            rlock = thread.RLock()
            # For reentrant locks, the initial acquisition must be in another
            # thread.
            def other_thread():
                rlock.acquire()
            thread.start_new_thread(other_thread, ())
            # Wait until we can't acquire it without blocking...
            while rlock.acquire(blocking=False):
                rlock.release()
                time.sleep(0.01)
            signal.alarm(1)
            t1 = time.time()
            self.assertRaises(KeyboardInterrupt, rlock.acquire, timeout=5)
            dt = time.time() - t1
            # See rationale above in test_lock_acquire_interruption
            self.assertLess(dt, 3.0)
        finally:
            signal.signal(signal.SIGALRM, oldalrm)