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6a10281d33
* Use try/except ImportError or test_support.import_module() to import thread and threading modules * Add @unittest.skipUnless(threading, ...) to testcases using threads
79 lines
2.2 KiB
Python
79 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, 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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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, unittest
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import test.test_support as test_support
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thread = test_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 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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