sysdeps/htl/pt-mutex-init.c

   1 /* Initialize a mutex.  Generic version.
   2    Copyright (C) 2000-2019 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 #include <pthread.h>
  20 #include <string.h>
  21 #include <stdlib.h>
  22 #include <assert.h>
  23
  24 #include <pt-internal.h>
  25
  26 int
  27 _pthread_mutex_init (pthread_mutex_t *mutex, const pthread_mutexattr_t *attr)
  28 {
  29   *mutex = (pthread_mutex_t) __PTHREAD_MUTEX_INITIALIZER;
  30
  31   if (attr == NULL
  32       || memcmp (attr, &__pthread_default_mutexattr, sizeof (*attr)) == 0)
  33     /* The default attributes.  */
  34     return 0;
  35
  36   if (mutex->__attr == NULL
  37       || mutex->__attr == __PTHREAD_ERRORCHECK_MUTEXATTR
  38       || mutex->__attr == __PTHREAD_RECURSIVE_MUTEXATTR)
  39     mutex->__attr = malloc (sizeof *attr);
  40
  41   if (mutex->__attr == NULL)
  42     return ENOMEM;
  43
  44   *mutex->__attr = *attr;
  45   return 0;
  46 }
  47
  48 strong_alias (_pthread_mutex_init, pthread_mutex_init);