Staging
v0.8.1
v0.8.1
https://github.com/python/cpython
Tip revision: 5a2bc5f6164050bc3e106768e9aea31364efd99a authored by cvs2svn on 18 November 2004, 12:32:27 UTC
This commit was manufactured by cvs2svn to create tag 'r24c1'.
This commit was manufactured by cvs2svn to create tag 'r24c1'.
Tip revision: 5a2bc5f
test_fork1.py
"""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()