traverseda
/
cpython
1
0
Fork 0
Code Issues Pull Requests Releases Wiki Activity

[3.6] bpo-30727: Fix a race condition in test_threading. (GH-2334) (#2351) 

(cherry picked from commit 32cb968)
This commit is contained in:
Serhiy Storchaka 2017-06-23 13:52:06 +03:00 committed by GitHub
parent bae5ddab2c
commit c1d5345679
1 changed files with 14 additions and 5 deletions
Show Stats Download Patch File Download Diff File Expand all files Collapse all files

19
Lib/test/lock_tests.py
View File

@ -461,21 +461,28 @@ class ConditionTests(BaseTestCase):
# construct. In particular, it is possible that this can no longer
# be conveniently guaranteed should their implementation ever change.
N = 5
ready = []
results1 = []
results2 = []
phase_num = 0
def f():
cond.acquire()
ready.append(phase_num)
result = cond.wait()
cond.release()
results1.append((result, phase_num))
cond.acquire()
ready.append(phase_num)
result = cond.wait()
cond.release()
results2.append((result, phase_num))
b = Bunch(f, N)
b.wait_for_started()
_wait()
# first wait, to ensure all workers settle into cond.wait() before
# we continue. See issues #8799 and #30727.
while len(ready) < 5:
_wait()
ready.clear()
self.assertEqual(results1, [])
# Notify 3 threads at first
cond.acquire()
@ -487,9 +494,9 @@ class ConditionTests(BaseTestCase):
_wait()
self.assertEqual(results1, [(True, 1)] * 3)
self.assertEqual(results2, [])
# first wait, to ensure all workers settle into cond.wait() before
# we continue. See issue #8799
_wait()
# make sure all awaken workers settle into cond.wait()
while len(ready) < 3:
_wait()
# Notify 5 threads: they might be in their first or second wait
cond.acquire()
cond.notify(5)
@ -500,7 +507,9 @@ class ConditionTests(BaseTestCase):
_wait()
self.assertEqual(results1, [(True, 1)] * 3 + [(True, 2)] * 2)
self.assertEqual(results2, [(True, 2)] * 3)
_wait() # make sure all workers settle into cond.wait()
# make sure all workers settle into cond.wait()
while len(ready) < 5:
_wait()
# Notify all threads: they are all in their second wait
cond.acquire()
cond.notify_all()