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      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 
     36 static pthread_mutex_t  lock = PTHREAD_MUTEX_INITIALIZER;
     37 
     38 static void*
     39 thread_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 
     69 int  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