htl/tests/test-9.c

   1 /* Test recursive mutexes.
   2    Copyright (C) 2000-2024 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 <error.h>
  24 #include <errno.h>
  25
  26 #define THREADS 10
  27
  28 int foo;
  29
  30 void *
  31 thr (void *arg)
  32 {
  33   int i;
  34
  35   pthread_mutex_lock (arg);
  36
  37   foo = pthread_self ();
  38
  39   for (i = 0; i < 500; i++)
  40     pthread_mutex_lock (arg);
  41   for (i = 0; i < 500; i++)
  42     pthread_mutex_unlock (arg);
  43
  44   assert (foo == pthread_self ());
  45
  46   pthread_mutex_unlock (arg);
  47
  48   return 0;
  49 }
  50
  51 int
  52 main (int argc, char **argv)
  53 {
  54   error_t err;
  55   int i;
  56   pthread_t tid[THREADS];
  57   pthread_mutexattr_t mattr;
  58   pthread_mutex_t mutex;
  59
  60   err = pthread_mutexattr_init (&mattr);
  61   if (err)
  62     error (1, err, "pthread_mutexattr_init");
  63
  64   err = pthread_mutexattr_settype (&mattr, PTHREAD_MUTEX_RECURSIVE);
  65   if (err)
  66     error (1, err, "pthread_mutexattr_settype");
  67
  68   err = pthread_mutex_init (&mutex, &mattr);
  69   if (err)
  70     error (1, err, "pthread_mutex_init");
  71
  72   err = pthread_mutexattr_destroy (&mattr);
  73   if (err)
  74     error (1, err, "pthread_mutexattr_destroy");
  75
  76   pthread_mutex_lock (&mutex);
  77   pthread_mutex_lock (&mutex);
  78   pthread_mutex_unlock (&mutex);
  79   pthread_mutex_unlock (&mutex);
  80
  81   for (i = 0; i < THREADS; i++)
  82     {
  83       err = pthread_create (&tid[i], 0, thr, &mutex);
  84       if (err)
  85         error (1, err, "pthread_create (%d)", i);
  86     }
  87
  88   for (i = 0; i < THREADS; i++)
  89     {
  90       void *ret;
  91
  92       err = pthread_join (tid[i], &ret);
  93       if (err)
  94         error (1, err, "pthread_join");
  95
  96       assert (ret == 0);
  97     }
  98
  99   err = pthread_mutex_destroy (&mutex);
 100   if (err)
 101     error (1, err, "pthread_mutex_destroy");
 102
 103   return 0;
 104 }