| 1 | """This test checks for correct fork() behavior. |
| 2 | |
| 3 | We want fork1() semantics -- only the forking thread survives in the |
| 4 | child after a fork(). |
| 5 | |
| 6 | On some systems (e.g. Solaris without posix threads) we find that all |
| 7 | active threads survive in the child after a fork(); this is an error. |
| 8 | |
| 9 | While BeOS doesn't officially support fork and native threading in |
| 10 | the same application, the present example should work just fine. DC |
| 11 | """ |
| 12 | |
| 13 | import os, sys, time, thread |
| 14 | from test.test_support import verify, verbose, TestSkipped |
| 15 | |
| 16 | try: |
| 17 | os.fork |
| 18 | except AttributeError: |
| 19 | raise TestSkipped, "os.fork not defined -- skipping test_fork1" |
| 20 | |
| 21 | LONGSLEEP = 2 |
| 22 | |
| 23 | SHORTSLEEP = 0.5 |
| 24 | |
| 25 | NUM_THREADS = 4 |
| 26 | |
| 27 | alive = {} |
| 28 | |
| 29 | stop = 0 |
| 30 | |
| 31 | def f(id): |
| 32 | while not stop: |
| 33 | alive[id] = os.getpid() |
| 34 | try: |
| 35 | time.sleep(SHORTSLEEP) |
| 36 | except IOError: |
| 37 | pass |
| 38 | |
| 39 | def main(): |
| 40 | for i in range(NUM_THREADS): |
| 41 | thread.start_new(f, (i,)) |
| 42 | |
| 43 | time.sleep(LONGSLEEP) |
| 44 | |
| 45 | a = alive.keys() |
| 46 | a.sort() |
| 47 | verify(a == range(NUM_THREADS)) |
| 48 | |
| 49 | prefork_lives = alive.copy() |
| 50 | |
| 51 | if sys.platform in ['unixware7']: |
| 52 | cpid = os.fork1() |
| 53 | else: |
| 54 | cpid = os.fork() |
| 55 | |
| 56 | if cpid == 0: |
| 57 | # Child |
| 58 | time.sleep(LONGSLEEP) |
| 59 | n = 0 |
| 60 | for key in alive.keys(): |
| 61 | if alive[key] != prefork_lives[key]: |
| 62 | n = n+1 |
| 63 | os._exit(n) |
| 64 | else: |
| 65 | # Parent |
| 66 | spid, status = os.waitpid(cpid, 0) |
| 67 | verify(spid == cpid) |
| 68 | verify(status == 0, |
| 69 | "cause = %d, exit = %d" % (status&0xff, status>>8) ) |
| 70 | global stop |
| 71 | # Tell threads to die |
| 72 | stop = 1 |
| 73 | time.sleep(2*SHORTSLEEP) # Wait for threads to die |
| 74 | |
| 75 | main() |