275 lines
7.4 KiB
C
275 lines
7.4 KiB
C
/* Test program for process and thread CPU clocks.
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Copyright (C) 2005-2022 Free Software Foundation, Inc.
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This file is part of the GNU C Library.
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The GNU C Library is free software; you can redistribute it and/or
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modify it under the terms of the GNU Lesser General Public
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License as published by the Free Software Foundation; either
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version 2.1 of the License, or (at your option) any later version.
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The GNU C Library is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public
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License along with the GNU C Library; if not, see
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<https://www.gnu.org/licenses/>. */
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#include <unistd.h>
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#include <stdint.h>
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#if (_POSIX_THREADS - 0) <= 0
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static int
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do_test ()
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{
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return 0;
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}
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#else
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#include <stdio.h>
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#include <stdlib.h>
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#include <time.h>
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#include <fcntl.h>
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#include <string.h>
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#include <errno.h>
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#include <pthread.h>
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static pthread_barrier_t barrier;
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/* This function is intended to rack up both user and system time. */
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static void *
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chew_cpu (void *arg)
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{
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pthread_barrier_wait (&barrier);
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while (1)
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{
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static volatile char buf[4096];
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for (int i = 0; i < 100; ++i)
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for (size_t j = 0; j < sizeof buf; ++j)
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buf[j] = 0xaa;
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int nullfd = open ("/dev/null", O_WRONLY);
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for (int i = 0; i < 100; ++i)
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for (size_t j = 0; j < sizeof buf; ++j)
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buf[j] = 0xbb;
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write (nullfd, (char *) buf, sizeof buf);
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close (nullfd);
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}
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return NULL;
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}
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static void
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test_nanosleep (clockid_t clock, const char *which,
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int *bad)
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{
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const struct timespec sleeptime = { .tv_nsec = 100000000 };
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int e = clock_nanosleep (clock, 0, &sleeptime, NULL);
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if (e == EINVAL || e == ENOTSUP || e == ENOSYS)
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{
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printf ("clock_nanosleep not supported for %s CPU clock: %s\n",
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which, strerror (e));
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return;
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}
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if (e != 0)
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{
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printf ("clock_nanosleep on %s CPU clock: %s\n", which, strerror (e));
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*bad = 1;
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return;
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}
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struct timespec after;
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if (clock_gettime (clock, &after) < 0)
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{
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printf ("clock_gettime on %s CPU clock %lx => %s\n",
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which, (unsigned long int) clock, strerror (errno));
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*bad = 1;
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return;
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}
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struct timespec sleeptimeabs = sleeptime;
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sleeptimeabs.tv_sec += after.tv_sec;
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sleeptimeabs.tv_nsec += after.tv_nsec;
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while (sleeptimeabs.tv_nsec >= 1000000000)
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{
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++sleeptimeabs.tv_sec;
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sleeptimeabs.tv_nsec -= 1000000000;
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}
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e = clock_nanosleep (clock, TIMER_ABSTIME, &sleeptimeabs, NULL);
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if (e != 0)
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{
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printf ("absolute clock_nanosleep on %s CPU clock: %s\n",
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which, strerror (e));
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*bad = 1;
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return;
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}
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struct timespec afterabs;
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if (clock_gettime (clock, &afterabs) < 0)
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{
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printf ("clock_gettime on %s CPU clock %lx => %s\n",
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which, (unsigned long int) clock, strerror (errno));
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*bad = 1;
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return;
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}
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return;
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}
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static int
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do_test (void)
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{
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int result = 0;
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clockid_t process_clock, th_clock, my_thread_clock;
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int e;
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pthread_t th;
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e = clock_getcpuclockid (0, &process_clock);
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if (e != 0)
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{
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printf ("clock_getcpuclockid on self => %s\n", strerror (e));
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return 1;
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}
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e = pthread_getcpuclockid (pthread_self (), &my_thread_clock);
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if (e != 0)
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{
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printf ("pthread_getcpuclockid on self => %s\n", strerror (e));
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return 1;
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}
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/* This is a kludge. This test fails if the semantics of thread and
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process clocks are wrong. The old code using hp-timing without kernel
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support has bogus semantics if there are context switches. We don't
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fail to report failure when the proper functionality is not available
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in the kernel. It so happens that Linux kernels without correct CPU
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clock support also lack CPU timer support, so we use use that to guess
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that we are using the bogus code and not test it. */
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timer_t t;
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if (timer_create (my_thread_clock, NULL, &t) != 0)
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{
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printf ("timer_create: %m\n");
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puts ("No support for CPU clocks with good semantics, skipping test");
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return 0;
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}
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timer_delete (t);
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pthread_barrier_init (&barrier, NULL, 2);
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e = pthread_create (&th, NULL, chew_cpu, NULL);
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if (e != 0)
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{
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printf ("pthread_create: %s\n", strerror (e));
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return 1;
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}
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e = pthread_getcpuclockid (th, &th_clock);
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if (e == ENOENT || e == ENOSYS || e == ENOTSUP)
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{
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puts ("pthread_getcpuclockid does not support other threads");
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return 1;
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}
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pthread_barrier_wait (&barrier);
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struct timespec res;
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if (clock_getres (th_clock, &res) < 0)
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{
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printf ("clock_getres on live thread clock %lx => %s\n",
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(unsigned long int) th_clock, strerror (errno));
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result = 1;
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return 1;
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}
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printf ("live thread clock %lx resolution %ju.%.9ju\n",
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(unsigned long int) th_clock,
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(uintmax_t) res.tv_sec, (uintmax_t) res.tv_nsec);
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struct timespec process_before, process_after;
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if (clock_gettime (process_clock, &process_before) < 0)
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{
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printf ("clock_gettime on process clock %lx => %s\n",
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(unsigned long int) process_clock, strerror (errno));
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return 1;
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}
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struct timespec before, after;
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if (clock_gettime (th_clock, &before) < 0)
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{
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printf ("clock_gettime on live thread clock %lx => %s\n",
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(unsigned long int) th_clock, strerror (errno));
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return 1;
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}
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printf ("live thread before sleep => %ju.%.9ju\n",
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(uintmax_t) before.tv_sec, (uintmax_t) before.tv_nsec);
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struct timespec me_before, me_after;
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if (clock_gettime (my_thread_clock, &me_before) < 0)
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{
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printf ("clock_gettime on self thread clock %lx => %s\n",
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(unsigned long int) my_thread_clock, strerror (errno));
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return 1;
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}
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printf ("self thread before sleep => %ju.%.9ju\n",
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(uintmax_t) me_before.tv_sec, (uintmax_t) me_before.tv_nsec);
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struct timespec sleeptime = { .tv_nsec = 500000000 };
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if (nanosleep (&sleeptime, NULL) != 0)
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{
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perror ("nanosleep");
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return 1;
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}
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if (clock_gettime (th_clock, &after) < 0)
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{
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printf ("clock_gettime on live thread clock %lx => %s\n",
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(unsigned long int) th_clock, strerror (errno));
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return 1;
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}
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printf ("live thread after sleep => %ju.%.9ju\n",
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(uintmax_t) after.tv_sec, (uintmax_t) after.tv_nsec);
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if (clock_gettime (process_clock, &process_after) < 0)
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{
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printf ("clock_gettime on process clock %lx => %s\n",
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(unsigned long int) process_clock, strerror (errno));
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return 1;
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}
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if (clock_gettime (my_thread_clock, &me_after) < 0)
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{
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printf ("clock_gettime on self thread clock %lx => %s\n",
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(unsigned long int) my_thread_clock, strerror (errno));
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return 1;
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}
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printf ("self thread after sleep => %ju.%.9ju\n",
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(uintmax_t) me_after.tv_sec, (uintmax_t) me_after.tv_nsec);
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test_nanosleep (th_clock, "live thread",
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&result);
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test_nanosleep (process_clock, "process",
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&result);
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test_nanosleep (CLOCK_PROCESS_CPUTIME_ID,
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"PROCESS_CPUTIME_ID", &result);
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pthread_cancel (th);
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e = clock_nanosleep (CLOCK_THREAD_CPUTIME_ID, 0, &sleeptime, NULL);
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if (e != EINVAL)
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{
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printf ("clock_nanosleep CLOCK_THREAD_CPUTIME_ID: %s\n",
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strerror (e));
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result = 1;
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}
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return result;
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}
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#endif
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#include <support/test-driver.c>
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