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 <stdio.h> 30 #include <stdlib.h> 31 #include <time.h> 32 33 #define N_THREADS 100 34 35 static pthread_once_t once = PTHREAD_ONCE_INIT; 36 37 static int global_count = 0; 38 39 static void once_function(void)40 once_function( void ) 41 { 42 struct timespec ts; 43 44 global_count += 1; 45 46 ts.tv_sec = 2; 47 ts.tv_nsec = 0; 48 nanosleep (&ts, NULL); 49 } 50 51 static void* thread_function(void * arg)52 thread_function(void* arg) 53 { 54 pthread_once( &once, once_function ); 55 56 if (global_count != 1) { 57 printf ("thread %ld: global == %d\n", (long int) arg, global_count); 58 exit (1); 59 } 60 return NULL; 61 } 62 main(void)63 int main( void ) 64 { 65 pthread_t threads[N_THREADS]; 66 int nn; 67 68 for (nn = 0; nn < N_THREADS; nn++) { 69 if (pthread_create( &threads[nn], NULL, thread_function, (void*)(long int)nn) < 0) { 70 printf("creation of thread %d failed\n", nn); 71 return 1; 72 } 73 } 74 75 for (nn = 0; nn < N_THREADS; nn++) { 76 if (pthread_join(threads[nn], NULL)) { 77 printf("joining thread %d failed\n", nn); 78 return 1; 79 } 80 } 81 return 0; 82 } 83