def test_single_threaded():
l = Lock()
assert l.acquire() == 1
assert l.locked()
assert l.release() == 0
assert l.acquire(blocking=1) == 1
assert l.locked()
for i in xrange(20):
assert l.acquire(blocking=0) == 0
assert l.locked()
assert l.release() == 0
def test_multi_threaded():
l = Lock()
output = []
def run(i):
try:
l.acquire()
old = output[:]
del output[:]
output.extend(old + [i])
finally:
l.release()
runs = 20
for i in xrange(runs):
t = Thread(target=run, args=(i,))
t.start()
t.join()
assert not l.locked()
assert len(output) == runs