htl/tests/test-15.c

   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 }