htl/tests/test-14.c

   1 /* Test pthread_mutex_timedlock.
   2    Copyright (C) 2000-2018 Free Software Foundation, Inc.
   3    This file is part of the GNU C Library.
   4
   5    The GNU C Library is free software; you can redistribute it and/or
   6    modify it under the terms of the GNU Lesser General Public
   7    License as published by the Free Software Foundation; either
   8    version 2.1 of the License, or (at your option) any later version.
   9
  10    The GNU C Library is distributed in the hope that it will be useful,
  11    but WITHOUT ANY WARRANTY; without even the implied warranty of
  12    MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
  13    Lesser General Public License for more details.
  14
  15    You should have received a copy of the GNU Lesser General Public
  16    License along with the GNU C Library;  if not, see
  17    <http://www.gnu.org/licenses/>.  */
  18
  19 #define _GNU_SOURCE
  20
  21 #include <pthread.h>
  22 #include <stdio.h>
  23 #include <assert.h>
  24 #include <error.h>
  25 #include <errno.h>
  26 #include <sys/time.h>
  27
  28 int
  29 main (int argc, char **argv)
  30 {
  31   error_t err;
  32   struct timespec ts;
  33   pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
  34   struct timeval before, after;
  35   int diff;
  36
  37   gettimeofday (&before, 0);
  38   ts.tv_sec = before.tv_sec + 1;
  39   ts.tv_nsec = before.tv_usec * 1000;
  40
  41   printf ("Starting wait @ %d\n", (int) before.tv_sec);
  42
  43   pthread_mutex_lock (&m);
  44   /* A default mutex shall dead lock if locked twice.  As such we do
  45      not need spawn a second thread.  */
  46   err = pthread_mutex_timedlock (&m, &ts);
  47   assert (err == ETIMEDOUT);
  48
  49   gettimeofday (&after, 0);
  50
  51   printf ("End wait @ %d\n", (int) after.tv_sec);
  52
  53   diff = after.tv_sec * 1000000 + after.tv_usec
  54       - before.tv_sec * 1000000 - before.tv_usec;
  55
  56   if (diff < 900000 || diff > 1100000)
  57     error (1, EGRATUITOUS, "pthread_mutex_timedlock waited %d us", diff);
  58
  59   return 0;
  60 }