1 /*	$OpenBSD: blocked_join.c,v 1.1 2012/02/27 23:40:37 fgsch Exp $	*/
2 /*
3  * Federico G. Schwindt <fgsch@openbsd.org>, 2012. Public Domain.
4  */
5 
6 #include <sys/types.h>
7 #include <sys/wait.h>
8 #include <pthread.h>
9 #include <stdlib.h>
10 #include <stdio.h>
11 #include <unistd.h>
12 #include "test.h"
13 
14 void *
15 deadlock_detector(void *arg)
16 {
17 	sleep(10);
18 	PANIC("deadlock detected");
19 }
20 
21 void *
22 joiner(void *arg)
23 {
24 	pthread_t mainthread = *(pthread_t *)arg;
25 	ASSERT(pthread_join(mainthread, NULL) == EDEADLK);
26 	return (NULL);
27 }
28 
29 int
30 main(int argc, char **argv)
31 {
32 	pthread_t d, t, self = pthread_self();
33 	pid_t pid;
34 
35 	switch ((pid = fork())) {
36 	case -1:
37 		PANIC("cannot fork");
38 		/* NOTREACHED */
39 
40 	case 0:
41 		/* child */
42 		break;
43 
44 	default:
45 		CHECKr(waitpid(pid, NULL, 0));
46 		_exit(0);
47 		/* NOTREACHED */
48 	}
49 
50         CHECKr(pthread_create(&d, NULL, deadlock_detector, NULL));
51 	CHECKr(pthread_create(&t, NULL, joiner, &self));
52 	CHECKr(pthread_join(t, NULL));
53 	SUCCEED;
54 }
55