glibc/htl/tests/test-14.c

/* Test pthread_mutex_timedlock.
   Copyright (C) 2000-2023 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/>.  */

#define _GNU_SOURCE

#include <pthread.h>
#include <stdio.h>
#include <assert.h>
#include <error.h>
#include <errno.h>
#include <sys/time.h>

int
main (int argc, char **argv)
{
  error_t err;
  struct timespec ts;
  pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
  struct timeval before, after;
  int diff;

  gettimeofday (&before, 0);
  ts.tv_sec = before.tv_sec + 1;
  ts.tv_nsec = before.tv_usec * 1000;

  printf ("Starting wait @ %d\n", (int) before.tv_sec);

  pthread_mutex_lock (&m);
  /* A default mutex shall dead lock if locked twice.  As such we do
     not need spawn a second thread.  */
  err = pthread_mutex_timedlock (&m, &ts);
  assert (err == ETIMEDOUT);

  gettimeofday (&after, 0);

  printf ("End wait @ %d\n", (int) after.tv_sec);

  diff = after.tv_sec * 1000000 + after.tv_usec
      - before.tv_sec * 1000000 - before.tv_usec;

  if (diff < 900000 || diff > 1100000)
    error (1, EGRATUITOUS, "pthread_mutex_timedlock waited %d us", diff);

  return 0;
}