def test_avoids_holding_deleted_lock(self):
# Intentionally release a lock (l1) while between open and fnctl in a
# second instance (l2)
lf1 = LockFile(self.tmppath('lockfile'))
lf1.acquire()
lf2 = LockFile(self.tmppath('lockfile'))
opened = threading.Event()
released = threading.Event()
os_open = os.open
def slow_open(*args, **kwargs):
r = os_open(*args, **kwargs)
opened.set()
released.wait(1)
return r
def acquire():
with mock.patch('os.open', new=slow_open):
lf2.try_acquire()
t = threading.Thread(target=acquire)
t.start()
opened.wait(1)
lf1.release()
released.set()
t.join()
self.assertFalse(lf2.held)
def test_duelling(self):
lf1 = LockFile(self.tmppath('lockfile'))
lf2 = LockFile(self.tmppath('lockfile'))
lf1.acquire()
self.assertRaises(LockedException, lf2.acquire)
lf1.release()
lf2.acquire()
self.assertRaises(LockedException, lf1.acquire)
lf2.release()
def test_retries(self):
lf = LockFile(self.tmppath('lockfile'))
lf.acquire()
threading.Timer(0.2, lf.release).start()
slf = SpinLockFile(self.tmppath('lockfile'), timeout=0.5)
self.assertTrue(lf.held)
slf.acquire()
self.assertFalse(lf.held)
def test_held_is_false_when_aquire_failed(self):
lf1 = LockFile(self.tmppath('lockfile'))
lf1.acquire()
lf2 = LockFile(self.tmppath('lockfile'))
lf2.try_acquire()
self.assertFalse(lf2.held)
def test_already_released(self):
lf = LockFile(self.tmppath('lockfile'))
self.assertRaises(UnlockedException, lf.release)
lf.acquire()
lf.release()
self.assertRaises(UnlockedException, lf.release)
def test_stale_lock(self):
lf = LockFile(self.tmppath('lockfile'))
open(self.tmppath('lockfile'), 'w').close()
lf.acquire()
lf.release()
self.assertNotTMPPExists('lockfile')
def test_times_out(self):
lf = LockFile(self.tmppath('lockfile'))
lf.acquire()
slf = SpinLockFile(self.tmppath('lockfile'), timeout=0.2)
self.assertRaises(LockedException, slf.acquire)
def test_creation_deletion(self):
lf = LockFile(self.tmppath('lockfile'))
lf.acquire()
self.assertTMPPExists('lockfile')
lf.release()
self.assertNotTMPPExists('lockfile')
