mirror of
https://github.com/python/cpython.git
synced 2024-12-25 09:44:37 +08:00
83 lines
2.3 KiB
Python
83 lines
2.3 KiB
Python
"""This test case provides support for checking forking and wait behavior.
|
|
|
|
To test different wait behavior, override the wait_impl method.
|
|
|
|
We want fork1() semantics -- only the forking thread survives in the
|
|
child after a fork().
|
|
|
|
On some systems (e.g. Solaris without posix threads) we find that all
|
|
active threads survive in the child after a fork(); this is an error.
|
|
"""
|
|
|
|
import os, sys, time, unittest
|
|
import test.support as support
|
|
_thread = support.import_module('_thread')
|
|
|
|
LONGSLEEP = 2
|
|
SHORTSLEEP = 0.5
|
|
NUM_THREADS = 4
|
|
|
|
class ForkWait(unittest.TestCase):
|
|
|
|
def setUp(self):
|
|
self.alive = {}
|
|
self.stop = 0
|
|
|
|
def f(self, id):
|
|
while not self.stop:
|
|
self.alive[id] = os.getpid()
|
|
try:
|
|
time.sleep(SHORTSLEEP)
|
|
except OSError:
|
|
pass
|
|
|
|
def wait_impl(self, cpid):
|
|
for i in range(10):
|
|
# waitpid() shouldn't hang, but some of the buildbots seem to hang
|
|
# in the forking tests. This is an attempt to fix the problem.
|
|
spid, status = os.waitpid(cpid, os.WNOHANG)
|
|
if spid == cpid:
|
|
break
|
|
time.sleep(2 * SHORTSLEEP)
|
|
|
|
self.assertEqual(spid, cpid)
|
|
self.assertEqual(status, 0, "cause = %d, exit = %d" % (status&0xff, status>>8))
|
|
|
|
@support.reap_threads
|
|
def test_wait(self):
|
|
for i in range(NUM_THREADS):
|
|
_thread.start_new(self.f, (i,))
|
|
|
|
# busy-loop to wait for threads
|
|
deadline = time.monotonic() + 10.0
|
|
while len(self.alive) < NUM_THREADS:
|
|
time.sleep(0.1)
|
|
if deadline < time.monotonic():
|
|
break
|
|
|
|
a = sorted(self.alive.keys())
|
|
self.assertEqual(a, list(range(NUM_THREADS)))
|
|
|
|
prefork_lives = self.alive.copy()
|
|
|
|
if sys.platform in ['unixware7']:
|
|
cpid = os.fork1()
|
|
else:
|
|
cpid = os.fork()
|
|
|
|
if cpid == 0:
|
|
# Child
|
|
time.sleep(LONGSLEEP)
|
|
n = 0
|
|
for key in self.alive:
|
|
if self.alive[key] != prefork_lives[key]:
|
|
n += 1
|
|
os._exit(n)
|
|
else:
|
|
# Parent
|
|
try:
|
|
self.wait_impl(cpid)
|
|
finally:
|
|
# Tell threads to die
|
|
self.stop = 1
|