1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
|
/*
* Copyright (C) 2008 The Android Open Source Project
* All rights reserved.
*
* Redistribution and use in source and binary forms, with or without
* modification, are permitted provided that the following conditions
* are met:
* * Redistributions of source code must retain the above copyright
* notice, this list of conditions and the following disclaimer.
* * Redistributions in binary form must reproduce the above copyright
* notice, this list of conditions and the following disclaimer in
* the documentation and/or other materials provided with the
* distribution.
*
* THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
* "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
* LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS
* FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE
* COPYRIGHT OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT,
* INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING,
* BUT NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS
* OF USE, DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED
* AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY,
* OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT
* OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF
* SUCH DAMAGE.
*/
/* this is a small test for pthread_getcpuclockid() and clock_gettime() */
#include <time.h>
#include <pthread.h>
#include <stdio.h>
#include <errno.h>
#include <string.h>
static pthread_mutex_t lock = PTHREAD_MUTEX_INITIALIZER;
static void*
thread_func( void* arg )
{
pthread_t self = pthread_self();
struct timespec ts;
clockid_t clock;
int e;
pthread_mutex_lock( &lock );
e = pthread_getcpuclockid( self, &clock );
if (e != 0) {
fprintf(stderr, "pthread_getcpuclockid(%08lx,) returned error %d: %s\n", self, e, strerror(e));
pthread_mutex_unlock( &lock );
return NULL;
}
ts.tv_sec = 0;
ts.tv_nsec = 300000000 + ((int)arg)*50000000;
nanosleep( &ts, &ts );
clock_gettime( clock, &ts );
fprintf(stderr, "thread %08lx: clock_gettime() returned %g nsecs\n", self, ts.tv_sec*1e9 + ts.tv_nsec);
pthread_mutex_unlock( &lock );
return NULL;
}
#define MAX_THREADS 16
int main( void )
{
int nn;
pthread_attr_t attr;
pthread_t threads[MAX_THREADS];
pthread_attr_init(&attr);
pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_JOINABLE);
for (nn = 0; nn < MAX_THREADS; nn++) {
pthread_create( &threads[nn], &attr, thread_func, (void*)nn );
}
for (nn = 0; nn < MAX_THREADS; nn++) {
void* dummy;
pthread_join( threads[nn], &dummy );
}
return 0;
}
|
