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 static pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER; 36 static pthread_cond_t cv = PTHREAD_COND_INITIALIZER; 37 38 static int wake; 39 static int stop; 40 41 static void * 42 thr_routine(void *arg __unused) 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 55 main(void) 56 { 57 pthread_t td; 58 int i; 59 void *result; 60 61 pthread_setconcurrency(1); 62 for (i = 0; i < NLOOPS; ++i) { 63 stop = 0; 64 wake = 0; 65 66 pthread_create(&td, NULL, thr_routine, NULL); 67 sleep(1); 68 printf("trying: %d\n", i); 69 pthread_mutex_lock(&m); 70 wake = 1; 71 pthread_cond_signal(&cv); 72 pthread_cancel(td); 73 pthread_mutex_unlock(&m); 74 stop = 1; 75 result = NULL; 76 pthread_join(td, &result); 77 if (result == PTHREAD_CANCELED) { 78 printf("the condition variable implementation does not\n" 79 "conform to SUSv3, a thread unblocked from\n" 80 "condition variable still can be canceled.\n"); 81 return (1); 82 } 83 } 84 85 printf("OK\n"); 86 return (0); 87 } 88