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/*
* pthread_mutex_init.c
*
* Description:
* This translation unit implements mutual exclusion (mutex) primitives.
*
* --------------------------------------------------------------------------
*
* Pthreads4w - POSIX Threads Library for Win32
* Copyright(C) 1998 John E. Bossom
* Copyright(C) 1999-2018, Pthreads4w contributors
*
* Homepage: https://sourceforge.net/projects/pthreads4w/
*
* The current list of contributors is contained
* in the file CONTRIBUTORS included with the source
* code distribution. The list can also be seen at the
* following World Wide Web location:
* https://sourceforge.net/p/pthreads4w/wiki/Contributors/
*
* This file is part of Pthreads4w.
*
* Pthreads4w is free software: you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation, either version 3 of the License, or
* (at your option) any later version.
*
* Pthreads4w is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with Pthreads4w. If not, see <http://www.gnu.org/licenses/>. *
*/
#ifdef HAVE_CONFIG_H
# include <config.h>
#endif
#include "pthread.h"
#include "implement.h"
int
pthread_mutex_init (pthread_mutex_t * mutex, const pthread_mutexattr_t * attr)
{
int result = 0;
pthread_mutex_t mx;
if (mutex == NULL)
{
return EINVAL;
}
if (attr != NULL && *attr != NULL)
{
if ((*attr)->pshared == PTHREAD_PROCESS_SHARED)
{
/*
* Creating mutex that can be shared between
* processes.
*/
#if _POSIX_THREAD_PROCESS_SHARED >= 0
/*
* Not implemented yet.
*/
#error ERROR [__FILE__, line __LINE__]: Process shared mutexes are not supported yet.
#else
return ENOSYS;
#endif /* _POSIX_THREAD_PROCESS_SHARED */
}
}
mx = (pthread_mutex_t) calloc (1, sizeof (*mx));
if (mx == NULL)
{
result = ENOMEM;
}
else
{
mx->lock_idx = 0;
mx->recursive_count = 0;
mx->robustNode = NULL;
if (attr == NULL || *attr == NULL)
{
mx->kind = PTHREAD_MUTEX_DEFAULT;
}
else
{
mx->kind = (*attr)->kind;
if ((*attr)->robustness == PTHREAD_MUTEX_ROBUST)
{
/*
* Use the negative range to represent robust types.
* Replaces a memory fetch with a register negate and incr
* in pthread_mutex_lock etc.
*
* Map 0,1,..,n to -1,-2,..,(-n)-1
*/
mx->kind = -mx->kind - 1;
mx->robustNode = (ptw32_robust_node_t*) malloc(sizeof(ptw32_robust_node_t));
if (NULL == mx->robustNode)
{
result = ENOMEM;
}
else
{
mx->robustNode->stateInconsistent = PTW32_ROBUST_CONSISTENT;
mx->robustNode->mx = mx;
mx->robustNode->next = NULL;
mx->robustNode->prev = NULL;
}
}
}
if (0 == result)
{
mx->ownerThread.p = NULL;
mx->event = CreateEvent (NULL, PTW32_FALSE, /* manual reset = No */
PTW32_FALSE, /* initial state = not signalled */
NULL); /* event name */
if (0 == mx->event)
{
result = ENOSPC;
}
}
}
if (0 != result)
{
if (NULL != mx->robustNode)
{
free (mx->robustNode);
}
free (mx);
mx = NULL;
}
*mutex = mx;
return (result);
}
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