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84bc19a453
The hppa ubuntu box sometimes hangs forever in these tests. My guess is that the wait is failing for some reason. Use WNOHANG, so we won't wait until the buildbot kills the test suite. I haven't been able to reproduce the failure, so I'm not sure if this will help or not. Hopefully, this change will cause the test to fail, rather than hang. That will be better since we will get the rest of the test results. It may also help us debug the real problem. *** The reason this originally failed was because there were many zombie children outstanding before rev 47158 cleaned them up. There are still hangs in test_subprocess that need to be addressed, but that will take more work. This should close some holes.
78 lines
2.2 KiB
Python
78 lines
2.2 KiB
Python
"""This test case provides support for checking forking and wait behavior.
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To test different wait behavior, overrise 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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While BeOS doesn't officially support fork and native threading in
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the same application, the present example should work just fine. DC
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"""
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import os, sys, time, thread, unittest
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from test.test_support import TestSkipped
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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 IOError:
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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.assertEquals(spid, cpid)
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self.assertEquals(status, 0, "cause = %d, exit = %d" % (status&0xff, status>>8))
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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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time.sleep(LONGSLEEP)
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a = self.alive.keys()
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a.sort()
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self.assertEquals(a, 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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self.wait_impl(cpid)
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# Tell threads to die
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self.stop = 1
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time.sleep(2*SHORTSLEEP) # Wait for threads to die
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