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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)
if __name__ == '__main__':
unittest.main()
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