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/* this is a small test for pthread_getcpuclockid() and clock_gettime() */ 29 30#include <time.h> 31#include <pthread.h> 32#include <stdio.h> 33#include <errno.h> 34#include <string.h> 35 36static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER; 37 38static void* 39thread_func( void* arg ) 40{ 41 pthread_t self = pthread_self(); 42 struct timespec ts; 43 clockid_t clock; 44 int e; 45 46 pthread_mutex_lock( &lock ); 47 48 e = pthread_getcpuclockid( self, &clock ); 49 if (e != 0) { 50 fprintf(stderr, "pthread_getcpuclockid(%08lx,) returned error %d: %s\n", self, e, strerror(e)); 51 pthread_mutex_unlock( &lock ); 52 return NULL; 53 } 54 55 ts.tv_sec = 0; 56 ts.tv_nsec = 300000000 + ((int)arg)*50000000; 57 nanosleep( &ts, &ts ); 58 59 clock_gettime( clock, &ts ); 60 fprintf(stderr, "thread %08lx: clock_gettime() returned %g nsecs\n", self, ts.tv_sec*1e9 + ts.tv_nsec); 61 62 pthread_mutex_unlock( &lock ); 63 64 return NULL; 65} 66 67#define MAX_THREADS 16 68 69int main( void ) 70{ 71 int nn; 72 pthread_attr_t attr; 73 pthread_t threads[MAX_THREADS]; 74 75 pthread_attr_init(&attr); 76 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE); 77 78 for (nn = 0; nn < MAX_THREADS; nn++) { 79 pthread_create( &threads[nn], &attr, thread_func, (void*)nn ); 80 } 81 for (nn = 0; nn < MAX_THREADS; nn++) { 82 void* dummy; 83 pthread_join( threads[nn], &dummy ); 84 } 85 return 0; 86} 87