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*
thread_func(void * arg)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
main(void)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