Showing content from http://svn.python.org/projects/python/branches/release24-maint/Lib/test/test_fork1.py below:
"""This test checks for correct fork() behavior. 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. While BeOS doesn't officially support fork and native threading in the same application, the present example should work just fine. DC """ import os, sys, time, thread from test.test_support import verify, verbose, TestSkipped try: os.fork except AttributeError: raise TestSkipped, "os.fork not defined -- skipping test_fork1" LONGSLEEP = 2 SHORTSLEEP = 0.5 NUM_THREADS = 4 alive = {} stop = 0 def f(id): while not stop: alive[id] = os.getpid() try: time.sleep(SHORTSLEEP) except IOError: pass def main(): for i in range(NUM_THREADS): thread.start_new(f, (i,)) time.sleep(LONGSLEEP) a = alive.keys() a.sort() verify(a == range(NUM_THREADS)) prefork_lives = 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 alive.keys(): if alive[key] != prefork_lives[key]: n = n+1 os._exit(n) else: # Parent spid, status = os.waitpid(cpid, 0) verify(spid == cpid) verify(status == 0, "cause = %d, exit = %d" % (status&0xff, status>>8) ) global stop # Tell threads to die stop = 1 time.sleep(2*SHORTSLEEP) # Wait for threads to die main()
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