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