nptl/tst-cond27.c

   1 /* Test pthread_cond_clockwait timeout.
   2
   3    Copyright (C) 2019 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    <http://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>