mirror of
https://github.com/python/cpython.git
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1e48eb3b9b
* Tolerate 10 seconds instead of 3 seconds for slow test * Faster test, use sleep of 100 ms instead of 1 sec * Replace a number of iterations with an explicit deadline for the timeout
82 lines
2.3 KiB
Python
82 lines
2.3 KiB
Python
"""This test case provides support for checking forking and wait behavior.
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To test different wait behavior, override the wait_impl method.
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We want fork1() semantics -- only the forking thread survives in the
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child after a fork().
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On some systems (e.g. Solaris without posix threads) we find that all
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active threads survive in the child after a fork(); this is an error.
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"""
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import os, sys, time, unittest
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import test.support as support
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_thread = support.import_module('_thread')
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LONGSLEEP = 2
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SHORTSLEEP = 0.5
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NUM_THREADS = 4
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class ForkWait(unittest.TestCase):
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def setUp(self):
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self.alive = {}
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self.stop = 0
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def f(self, id):
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while not self.stop:
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self.alive[id] = os.getpid()
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try:
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time.sleep(SHORTSLEEP)
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except OSError:
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pass
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def wait_impl(self, cpid):
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for i in range(10):
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# waitpid() shouldn't hang, but some of the buildbots seem to hang
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# in the forking tests. This is an attempt to fix the problem.
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spid, status = os.waitpid(cpid, os.WNOHANG)
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if spid == cpid:
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break
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time.sleep(2 * SHORTSLEEP)
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self.assertEqual(spid, cpid)
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self.assertEqual(status, 0, "cause = %d, exit = %d" % (status&0xff, status>>8))
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@support.reap_threads
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def test_wait(self):
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for i in range(NUM_THREADS):
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_thread.start_new(self.f, (i,))
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# busy-loop to wait for threads
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deadline = time.monotonic() + 10.0
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while len(self.alive) < NUM_THREADS:
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time.sleep(0.1)
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if time.monotonic() <= deadline:
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break
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a = sorted(self.alive.keys())
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self.assertEqual(a, list(range(NUM_THREADS)))
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prefork_lives = self.alive.copy()
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if sys.platform in ['unixware7']:
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cpid = os.fork1()
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else:
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cpid = os.fork()
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if cpid == 0:
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# Child
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time.sleep(LONGSLEEP)
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n = 0
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for key in self.alive:
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if self.alive[key] != prefork_lives[key]:
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n += 1
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os._exit(n)
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else:
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# Parent
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try:
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self.wait_impl(cpid)
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finally:
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# Tell threads to die
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self.stop = 1
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