1  /* Test pthread_cond_clockwait timeout.
       2  
       3     Copyright (C) 2019-2023 Free Software Foundation, Inc.
       4     This file is part of the GNU C Library.
       5  
       6     The GNU C Library is free software; you can redistribute it and/or
       7     modify it under the terms of the GNU Lesser General Public
       8     License as published by the Free Software Foundation; either
       9     version 2.1 of the License, or (at your option) any later version.
      10  
      11     The GNU C Library is distributed in the hope that it will be useful,
      12     but WITHOUT ANY WARRANTY; without even the implied warranty of
      13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
      14     Lesser General Public License for more details.
      15  
      16     You should have received a copy of the GNU Lesser General Public
      17     License along with the GNU C Library; if not, see
      18     <https://www.gnu.org/licenses/>.  */
      19  
      20  #include <errno.h>
      21  #include <pthread.h>
      22  #include <stdio.h>
      23  #include <stdlib.h>
      24  #include <string.h>
      25  #include <time.h>
      26  #include <sys/time.h>
      27  #include <support/check.h>
      28  #include <support/timespec.h>
      29  #include <support/xthread.h>
      30  
      31  
      32  static pthread_mutex_t mut = PTHREAD_ERRORCHECK_MUTEX_INITIALIZER_NP;
      33  static pthread_cond_t cond = PTHREAD_COND_INITIALIZER;
      34  
      35  
      36  static int
      37  do_test_clock (clockid_t clockid)
      38  {
      39    /* Get the mutex.  */
      40    xpthread_mutex_lock (&mut);
      41  
      42    /* Waiting for the condition will fail.  But we want the timeout here.  */
      43    const struct timespec ts_now = xclock_now (clockid);
      44    const struct timespec ts_timeout =
      45      timespec_add (ts_now, make_timespec (0, 500000000));
      46  
      47    /* In theory pthread_cond_clockwait could return zero here due to
      48       spurious wakeup. However that can't happen without a signal or an
      49       additional waiter.  */
      50    TEST_COMPARE (pthread_cond_clockwait (&cond, &mut, clockid, &ts_timeout),
      51                  ETIMEDOUT);
      52  
      53    xpthread_mutex_unlock (&mut);
      54  
      55    return 0;
      56  }
      57  
      58  static int
      59  do_test (void)
      60  {
      61    do_test_clock (CLOCK_MONOTONIC);
      62    do_test_clock (CLOCK_REALTIME);
      63    return 0;
      64  }
      65  
      66  #include <support/test-driver.c>