1*3d31bb10Sfgsch /* $OpenBSD: blocked_join.c,v 1.2 2012/08/22 22:51:27 fgsch Exp $ */
2173a9d76Sfgsch /*
3173a9d76Sfgsch * Federico G. Schwindt <fgsch@openbsd.org>, 2012. Public Domain.
4173a9d76Sfgsch */
5173a9d76Sfgsch
6173a9d76Sfgsch #include <sys/types.h>
7173a9d76Sfgsch #include <sys/wait.h>
8173a9d76Sfgsch #include <pthread.h>
9173a9d76Sfgsch #include <stdlib.h>
10173a9d76Sfgsch #include <stdio.h>
11173a9d76Sfgsch #include <unistd.h>
12173a9d76Sfgsch #include "test.h"
13173a9d76Sfgsch
14173a9d76Sfgsch void *
deadlock_detector(void * arg)15173a9d76Sfgsch deadlock_detector(void *arg)
16173a9d76Sfgsch {
17173a9d76Sfgsch sleep(10);
18173a9d76Sfgsch PANIC("deadlock detected");
19173a9d76Sfgsch }
20173a9d76Sfgsch
21173a9d76Sfgsch void *
joiner(void * arg)22173a9d76Sfgsch joiner(void *arg)
23173a9d76Sfgsch {
24173a9d76Sfgsch pthread_t mainthread = *(pthread_t *)arg;
25173a9d76Sfgsch ASSERT(pthread_join(mainthread, NULL) == EDEADLK);
26173a9d76Sfgsch return (NULL);
27173a9d76Sfgsch }
28173a9d76Sfgsch
29173a9d76Sfgsch int
main(int argc,char ** argv)30173a9d76Sfgsch main(int argc, char **argv)
31173a9d76Sfgsch {
32173a9d76Sfgsch pthread_t d, t, self = pthread_self();
33173a9d76Sfgsch pid_t pid;
34173a9d76Sfgsch
35173a9d76Sfgsch switch ((pid = fork())) {
36173a9d76Sfgsch case -1:
37173a9d76Sfgsch PANIC("cannot fork");
38173a9d76Sfgsch /* NOTREACHED */
39173a9d76Sfgsch
40173a9d76Sfgsch case 0:
41173a9d76Sfgsch /* child */
42173a9d76Sfgsch break;
43173a9d76Sfgsch
44173a9d76Sfgsch default:
45*3d31bb10Sfgsch CHECKe(waitpid(pid, NULL, 0));
46173a9d76Sfgsch _exit(0);
47173a9d76Sfgsch /* NOTREACHED */
48173a9d76Sfgsch }
49173a9d76Sfgsch
50173a9d76Sfgsch CHECKr(pthread_create(&d, NULL, deadlock_detector, NULL));
51173a9d76Sfgsch CHECKr(pthread_create(&t, NULL, joiner, &self));
52173a9d76Sfgsch CHECKr(pthread_join(t, NULL));
53173a9d76Sfgsch SUCCEED;
54173a9d76Sfgsch }
55