1 /* 2 * Copyright (C) 2008 The Android Open Source Project 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 * * Redistributions of source code must retain the above copyright 9 * notice, this list of conditions and the following disclaimer. 10 * * Redistributions in binary form must reproduce the above copyright 11 * notice, this list of conditions and the following disclaimer in 12 * the documentation and/or other materials provided with the 13 * distribution. 14 * 15 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS 16 * "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT 17 * LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS 18 * FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE 19 * COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, 20 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, 21 * BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS 22 * OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED 23 * AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, 24 * OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT 25 * OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF 26 * SUCH DAMAGE. 27 */ 28 #include <pthread.h> 29 #include <semaphore.h> 30 #include <errno.h> 31 #include <stdio.h> 32 #include <time.h> 33 #include <string.h> 34 #include <unistd.h> 35 36 static pthread_mutex_t lock = PTHREAD_RECURSIVE_MUTEX_INITIALIZER; 37 static pthread_cond_t wait = PTHREAD_COND_INITIALIZER; 38 39 static void* _thread1(void *__u __attribute__((unused))) 40 { 41 printf("1: obtaining mutex\n"); 42 pthread_mutex_lock(&lock); 43 printf("1: waiting on condition variable\n"); 44 pthread_cond_wait(&wait, &lock); 45 printf("1: releasing mutex\n"); 46 pthread_mutex_unlock(&lock); 47 printf("1: exiting\n"); 48 return NULL; 49 } 50 51 static void* _thread2(void *__u __attribute__((unused))) 52 { 53 int cnt = 2; 54 while(cnt--) { 55 printf("2: obtaining mutex\n"); 56 pthread_mutex_lock(&lock); 57 printf("2: signaling\n"); 58 pthread_cond_signal(&wait); 59 printf("2: releasing mutex\n"); 60 pthread_mutex_unlock(&lock); 61 } 62 63 printf("2: exiting\n"); 64 return NULL; 65 } 66 67 typedef void* (*thread_func)(void*); 68 static const thread_func thread_routines[] = 69 { 70 &_thread1, 71 &_thread2, 72 }; 73 74 int main(void) 75 { 76 pthread_t t[2]; 77 int nn; 78 int count = (int)(sizeof t/sizeof t[0]); 79 80 for (nn = 0; nn < count; nn++) { 81 printf("main: creating thread %d\n", nn+1); 82 if (pthread_create( &t[nn], NULL, thread_routines[nn], NULL) < 0) { 83 printf("main: could not create thread %d: %s\n", nn+1, strerror(errno)); 84 return -2; 85 } 86 } 87 88 for (nn = 0; nn < count; nn++) { 89 printf("main: joining thread %d\n", nn+1); 90 if (pthread_join(t[nn], NULL)) { 91 printf("main: could not join thread %d: %s\n", nn+1, strerror(errno)); 92 return -2; 93 } 94 } 95 96 return 0; 97 } 98
