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  */
27 #include <pthread.h>
28 #include <stdio.h>
29 #include <unistd.h>
30 
31 #define NLOOPS	10
32 
33 static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
34 static pthread_cond_t cv = PTHREAD_COND_INITIALIZER;
35 
36 static int wake;
37 static int stop;
38 
39 static void *
40 thr_routine(void *arg __unused)
41 {
42 	pthread_mutex_lock(&m);
43 	while (wake == 0)
44 		pthread_cond_wait(&cv, &m);
45 	pthread_mutex_unlock(&m);
46 
47 	while (stop == 0)
48 		pthread_yield();
49 	return (NULL);
50 }
51 
52 int
53 main(void)
54 {
55 	pthread_t td;
56 	int i;
57 	void *result;
58 
59 	pthread_setconcurrency(1);
60 	for (i = 0; i < NLOOPS; ++i) {
61 		stop = 0;
62 		wake = 0;
63 
64 		pthread_create(&td, NULL, thr_routine, NULL);
65 		sleep(1);
66 		printf("trying: %d\n", i);
67 		pthread_mutex_lock(&m);
68 		wake = 1;
69 		pthread_cond_signal(&cv);
70 		pthread_cancel(td);
71 		pthread_mutex_unlock(&m);
72 		stop = 1;
73 		result = NULL;
74 		pthread_join(td, &result);
75 		if (result == PTHREAD_CANCELED) {
76 			printf("the condition variable implementation does not\n"
77 			       "conform to SUSv3, a thread unblocked from\n"
78 			       "condition variable still can be canceled.\n");
79 			return (1);
80 		}
81 	}
82 
83 	printf("OK\n");
84 	return (0);
85 }
86