xref: /openbsd-src/regress/lib/libpthread/signals/pthread_mutex_lock/pthread_mutex_lock.c (revision 6355590a4bbf151f3e0689e56ce0b7de5d3ae6f2)
1 /*	$OpenBSD: pthread_mutex_lock.c,v 1.1 2011/10/01 10:26:59 fgsch Exp $	*/
2 /*
3  * Federico G. Schwindt <fgsch@openbsd.org>, 2011. Public Domain.
4  */
5 #include <pthread.h>
6 #include <signal.h>
7 #include <unistd.h>
8 #include "test.h"
9 
10 pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
11 volatile sig_atomic_t hits = 0;
12 
13 void
handler(int sig)14 handler(int sig)
15 {
16 	hits++;
17 }
18 
19 void *
thr_lock(void * arg)20 thr_lock(void *arg)
21 {
22 	CHECKr(pthread_mutex_lock(&lock));
23 	return (NULL);
24 }
25 
26 int
main(int argc,char ** argv)27 main(int argc, char **argv)
28 {
29 	struct sigaction sa;
30 	pthread_t tid;
31 
32 	bzero(&sa, sizeof(sa));
33 	sa.sa_handler = handler;
34 	CHECKe(sigaction(SIGUSR1, &sa, NULL));
35 
36 	CHECKr(pthread_mutex_lock(&lock));
37 	CHECKr(pthread_create(&tid, NULL, thr_lock, NULL));
38 	sleep(2);
39 
40 	CHECKr(pthread_kill(tid, SIGUSR1));
41 	sleep(1);
42 
43 	CHECKr(pthread_mutex_unlock(&lock));
44 	ASSERT(hits == 1);
45 	SUCCEED;
46 }
47