bab1116809
https://github.com/eventlet/eventlet/issues/136 https://github.com/eventlet/eventlet/pull/163 (comment by Sergey Shepelev) _waiters is now deque, watch out for O(N) acquire()
68 lines
1.8 KiB
Python
68 lines
1.8 KiB
Python
import time
|
|
import unittest
|
|
|
|
import eventlet
|
|
from eventlet import semaphore
|
|
from tests import LimitedTestCase
|
|
|
|
|
|
class TestSemaphore(LimitedTestCase):
|
|
|
|
def test_bounded(self):
|
|
sem = semaphore.CappedSemaphore(2, limit=3)
|
|
self.assertEqual(sem.acquire(), True)
|
|
self.assertEqual(sem.acquire(), True)
|
|
gt1 = eventlet.spawn(sem.release)
|
|
self.assertEqual(sem.acquire(), True)
|
|
self.assertEqual(-3, sem.balance)
|
|
sem.release()
|
|
sem.release()
|
|
sem.release()
|
|
gt2 = eventlet.spawn(sem.acquire)
|
|
sem.release()
|
|
self.assertEqual(3, sem.balance)
|
|
gt1.wait()
|
|
gt2.wait()
|
|
|
|
def test_bounded_with_zero_limit(self):
|
|
sem = semaphore.CappedSemaphore(0, 0)
|
|
gt = eventlet.spawn(sem.acquire)
|
|
sem.release()
|
|
gt.wait()
|
|
|
|
def test_non_blocking(self):
|
|
sem = semaphore.Semaphore(0)
|
|
self.assertEqual(sem.acquire(blocking=False), False)
|
|
|
|
def test_timeout(self):
|
|
sem = semaphore.Semaphore(0)
|
|
start = time.time()
|
|
self.assertEqual(sem.acquire(timeout=0.1), False)
|
|
self.assertTrue(time.time() - start >= 0.1)
|
|
|
|
def test_timeout_non_blocking(self):
|
|
sem = semaphore.Semaphore()
|
|
self.assertRaises(ValueError, sem.acquire, blocking=False, timeout=1)
|
|
|
|
|
|
def test_semaphore_contention():
|
|
g_mutex = semaphore.Semaphore()
|
|
counts = [0, 0]
|
|
|
|
def worker(no):
|
|
while min(counts) < 200:
|
|
with g_mutex:
|
|
counts[no - 1] += 1
|
|
eventlet.sleep(0.001)
|
|
|
|
t1 = eventlet.spawn(worker, no=1)
|
|
t2 = eventlet.spawn(worker, no=2)
|
|
eventlet.sleep(0.5)
|
|
t1.kill()
|
|
t2.kill()
|
|
|
|
assert abs(counts[0] - counts[1]) < int(min(counts) * 0.1), counts
|
|
|
|
|
|
if __name__ == '__main__':
|
|
unittest.main() |