1 /*-
2  * Copyright (c) 2006, David Xu <davidxu@freebsd.org>
3  * All rights reserved.
4  *
5  * Redistribution and use in source and binary forms, with or without
6  * modification, are permitted provided that the following conditions
7  * are met:
8  * 1. Redistributions of source code must retain the above copyright
9  *    notice unmodified, this list of conditions, and the following
10  *    disclaimer.
11  * 2. Redistributions in binary form must reproduce the above copyright
12  *    notice, this list of conditions and the following disclaimer in the
13  *    documentation and/or other materials provided with the distribution.
14  *
15  * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16  * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17  * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18  * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19  * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20  * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21  * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22  * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23  * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24  * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25  *
26  * $FreeBSD$
27  *
28  */
29 #include <pthread.h>
30 #include <stdio.h>
31 #include <unistd.h>
32 
33 #define NLOOPS	10
34 
35 pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
36 pthread_cond_t cv = PTHREAD_COND_INITIALIZER;
37 
38 int wake;
39 int stop;
40 
41 void *
42 thr_routine(void *arg)
43 {
44 	pthread_mutex_lock(&m);
45 	while (wake == 0)
46 		pthread_cond_wait(&cv, &m);
47 	pthread_mutex_unlock(&m);
48 
49 	while (stop == 0)
50 		pthread_yield();
51 	return (NULL);
52 }
53 
54 int main(int argc, char **argv)
55 {
56 	pthread_t td;
57 	int i;
58 	void *result;
59 
60 	pthread_setconcurrency(1);
61 	for (i = 0; i < NLOOPS; ++i) {
62 		stop = 0;
63 		wake = 0;
64 
65 		pthread_create(&td, NULL, thr_routine, NULL);
66 		sleep(1);
67 		printf("trying: %d\n", i);
68 		pthread_mutex_lock(&m);
69 		wake = 1;
70 		pthread_cond_signal(&cv);
71 		pthread_cancel(td);
72 		pthread_mutex_unlock(&m);
73 		stop = 1;
74 		result = NULL;
75 		pthread_join(td, &result);
76 		if (result == PTHREAD_CANCELED) {
77 			printf("the condition variable implementation does not\n"
78 			       "conform to SUSv3, a thread unblocked from\n"
79 			       "condition variable still can be canceled.\n");
80 			return (1);
81 		}
82 	}
83 
84 	printf("OK\n");
85 	return (0);
86 }
87