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/* Copyright (C) 2003-2022 Free Software Foundation, Inc.
This file is part of the GNU C Library.
The GNU C Library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 2.1 of the License, or (at your option) any later version.
The GNU C Library is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with the GNU C Library; if not, see
<https://www.gnu.org/licenses/>. */
#include <errno.h>
#include <pthread.h>
#include <stdio.h>
#include <stdlib.h>
#include <time.h>
#include <unistd.h>
#if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
static pthread_barrier_t b2;
static pthread_barrier_t bN;
static void *
tf (void *arg)
{
int e = pthread_barrier_wait (&b2);
if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
{
puts ("barrier_wait failed");
exit (1);
}
e = pthread_barrier_wait (&bN);
if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
{
puts ("barrier_wait failed");
exit (1);
}
return NULL;
}
#endif
int
do_test (void)
{
#if defined _POSIX_THREAD_CPUTIME && _POSIX_THREAD_CPUTIME >= 0
# define N 10
# if _POSIX_THREAD_CPUTIME == 0
if (sysconf (_SC_THREAD_CPUTIME) < 0)
{
puts ("_POSIX_THREAD_CPUTIME option not available");
return 0;
}
# endif
if (pthread_barrier_init (&b2, NULL, 2) != 0
|| pthread_barrier_init (&bN, NULL, N + 1) != 0)
{
puts ("barrier_init failed");
return 1;
}
struct timespec ts = { .tv_sec = 0, .tv_nsec = 100000000 };
TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
pthread_t th[N + 1];
clockid_t cl[N + 1];
# ifndef CLOCK_THREAD_CPUTIME_ID
if (pthread_getcpuclockid (pthread_self (), &cl[0]) != 0)
{
puts ("own pthread_getcpuclockid failed");
return 1;
}
# else
cl[0] = CLOCK_THREAD_CPUTIME_ID;
# endif
pthread_attr_t at;
if (pthread_attr_init (&at) != 0)
{
puts ("attr_init failed");
return 1;
}
if (pthread_attr_setstacksize (&at, 1 * 1024 * 1024) != 0)
{
puts ("attr_setstacksize failed");
return 1;
}
int i;
int e;
for (i = 0; i < N; ++i)
{
if (pthread_create (&th[i], &at, tf, NULL) != 0)
{
puts ("create failed");
return 1;
}
e = pthread_barrier_wait (&b2);
if (e != 0 && e != PTHREAD_BARRIER_SERIAL_THREAD)
{
puts ("barrier_wait failed");
return 1;
}
ts.tv_sec = 0;
ts.tv_nsec = 100000000;
TEMP_FAILURE_RETRY (nanosleep (&ts, &ts));
if (pthread_getcpuclockid (th[i], &cl[i + 1]) != 0)
{
puts ("pthread_getcpuclockid failed");
return 1;
}
}
if (pthread_attr_destroy (&at) != 0)
{
puts ("attr_destroy failed");
return 1;
}
struct timespec t[N + 1];
for (i = 0; i < N + 1; ++i)
if (clock_gettime (cl[i], &t[i]) != 0)
{
printf ("clock_gettime round %d failed\n", i);
return 1;
}
for (i = 0; i < N; ++i)
{
struct timespec diff;
diff.tv_sec = t[i].tv_sec - t[i + 1].tv_sec;
diff.tv_nsec = t[i].tv_nsec - t[i + 1].tv_nsec;
if (diff.tv_nsec < 0)
{
diff.tv_nsec += 1000000000;
--diff.tv_sec;
}
if (diff.tv_sec < 0 || (diff.tv_sec == 0 && diff.tv_nsec < 100000000))
{
printf ("\
difference between thread %d and %d too small (%ld.%09ld)\n",
i, i + 1, (long int) diff.tv_sec, (long int) diff.tv_nsec);
return 1;
}
printf ("diff %d->%d: %ld.%09ld\n",
i, i + 1, (long int) diff.tv_sec, (long int) diff.tv_nsec);
}
ts.tv_sec = 0;
ts.tv_nsec = 0;
for (i = 0; i < N + 1; ++i)
if (clock_settime (cl[i], &ts) != 0)
{
printf ("clock_settime(%d) round %d failed\n", cl[i], i);
return 1;
}
for (i = 0; i < N + 1; ++i)
{
if (clock_gettime (cl[i], &ts) != 0)
{
puts ("clock_gettime failed");
return 1;
}
if (ts.tv_sec > t[i].tv_sec
|| (ts.tv_sec == t[i].tv_sec && ts.tv_nsec > t[i].tv_nsec))
{
puts ("clock_settime didn't reset clock");
return 1;
}
}
#endif
return 0;
}
#define TEST_FUNCTION do_test ()
#include "../test-skeleton.c"
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