htl/tests/test-1.c

   1 /* Test mutexes.
   2    Copyright (C) 2000-2021 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 <assert.h>
  23 #include <unistd.h>
  24 #include <error.h>
  25 #include <errno.h>
  26 #include <stdio.h>
  27
  28 #define THREADS 500
  29
  30 void *
  31 foo (void *arg)
  32 {
  33   pthread_mutex_t *mutex = arg;
  34   pthread_mutex_lock (mutex);
  35   pthread_mutex_unlock (mutex);
  36   return mutex;
  37 }
  38
  39 int
  40 main (int argc, char **argv)
  41 {
  42   int i;
  43   error_t err;
  44   pthread_t tid[THREADS];
  45   pthread_mutex_t mutex[THREADS];
  46
  47   for (i = 0; i < THREADS; i++)
  48     {
  49       pthread_mutex_init (&mutex[i], 0);
  50       pthread_mutex_lock (&mutex[i]);
  51       err = pthread_create (&tid[i], 0, foo, &mutex[i]);
  52       if (err)
  53         error (1, err, "pthread_create");
  54       sched_yield ();
  55     }
  56
  57   for (i = THREADS - 1; i >= 0; i--)
  58     {
  59       void *ret;
  60       pthread_mutex_unlock (&mutex[i]);
  61       err = pthread_join (tid[i], &ret);
  62       if (err)
  63         error (1, err, "pthread_join");
  64       assert (ret == &mutex[i]);
  65     }
  66
  67   return 0;
  68 }