1  /* Test pthread_rwlock_timedrdlock and pthread_rwlock_timedwrlock.
       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  #define THREADS 10
      29  
      30  pthread_rwlock_t rwlock;
      31  
      32  void *
      33  test (void *arg)
      34  {
      35    error_t err;
      36    int foo = (int) arg;
      37    struct timespec ts;
      38    struct timeval before, after;
      39    int diff;
      40  
      41    gettimeofday (&before, 0);
      42    ts.tv_sec = before.tv_sec + 1;
      43    ts.tv_nsec = before.tv_usec * 1000;
      44  
      45    printf ("Thread %d starting wait @ %d\n", pthread_self (),
      46  	  (int) before.tv_sec);
      47  
      48    if (foo % 2 == 0)
      49      err = pthread_rwlock_timedrdlock (&rwlock, &ts);
      50    else
      51      err = pthread_rwlock_timedwrlock (&rwlock, &ts);
      52  
      53    assert (err == ETIMEDOUT);
      54  
      55    gettimeofday (&after, 0);
      56  
      57    printf ("Thread %d ending wait @ %d\n", pthread_self (), (int) after.tv_sec);
      58  
      59    diff = after.tv_sec * 1000000 + after.tv_usec
      60        - before.tv_sec * 1000000 - before.tv_usec;
      61  
      62    if (diff < 900000 || diff > 1100000)
      63      error (1, EGRATUITOUS, "pthread_mutex_timedlock waited %d us", diff);
      64  
      65    return 0;
      66  }
      67  
      68  int
      69  main (int argc, char **argv)
      70  {
      71    error_t err;
      72    int i;
      73    pthread_t tid[THREADS];
      74  
      75    err = pthread_rwlock_init (&rwlock, 0);
      76    if (err)
      77      error (1, err, "pthread_rwlock_init");
      78  
      79    /* Lock it so all the threads will block.  */
      80    err = pthread_rwlock_wrlock (&rwlock);
      81    assert (err == 0);
      82  
      83    for (i = 0; i < THREADS; i++)
      84      {
      85        err = pthread_create (&tid[i], 0, test, (void *) i);
      86        if (err)
      87  	error (1, err, "pthread_create");
      88      }
      89  
      90    for (i = 0; i < THREADS; i++)
      91      {
      92        void *ret;
      93  
      94        err = pthread_join (tid[i], &ret);
      95        if (err)
      96  	error (1, err, "pthread_join");
      97  
      98        assert (ret == 0);
      99      }
     100  
     101    return 0;
     102  }