1  /* Test condition attributes and pthread_cond_timedwait.
       2     Copyright (C) 2000-2023 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     <https://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    int i;
      33    pthread_condattr_t attr;
      34    pthread_cond_t cond;
      35    struct timespec ts;
      36    pthread_mutex_t m = PTHREAD_MUTEX_INITIALIZER;
      37    struct timeval before, after;
      38    int diff;
      39  
      40    err = pthread_condattr_init (&attr);
      41    if (err)
      42      error (1, err, "pthread_condattr_init");
      43  
      44    err = pthread_condattr_getpshared (&attr, &i);
      45    if (err)
      46      error (1, err, "pthread_condattr_getpshared");
      47    assert (i == PTHREAD_PROCESS_PRIVATE);
      48  
      49    err = pthread_condattr_setpshared (&attr, PTHREAD_PROCESS_PRIVATE);
      50    assert (err == 0);
      51  
      52    err = pthread_cond_init (&cond, &attr);
      53    if (err)
      54      error (1, err, "pthread_cond_init");
      55  
      56    err = pthread_condattr_destroy (&attr);
      57    if (err)
      58      error (1, err, "pthread_condattr_destroy");
      59  
      60    gettimeofday (&before, 0);
      61    ts.tv_sec = before.tv_sec + 1;
      62    ts.tv_nsec = before.tv_usec * 1000;
      63  
      64    printf ("Starting wait @ %d\n", (int) before.tv_sec);
      65  
      66    pthread_mutex_lock (&m);
      67    err = pthread_cond_timedwait (&cond, &m, &ts);
      68  
      69    gettimeofday (&after, 0);
      70  
      71    printf ("End wait @ %d (err = %d)\n", (int) after.tv_sec, err);
      72  
      73    assert (err == ETIMEDOUT);
      74  
      75    diff = after.tv_sec * 1000000 + after.tv_usec
      76        - before.tv_sec * 1000000 - before.tv_usec;
      77  
      78    if (diff < 900000 || diff > 1100000)
      79      error (1, EGRATUITOUS, "pthread_cond_timedwait waited %d us", diff);
      80  
      81    return 0;
      82  }