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