131 lines
3.8 KiB
C
131 lines
3.8 KiB
C
/*
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* pthread_mutex_init.c
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*
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* Description:
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* This translation unit implements mutual exclusion (mutex) primitives.
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*
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* --------------------------------------------------------------------------
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*
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* Pthreads-win32 - POSIX Threads Library for Win32
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* Copyright(C) 1998 John E. Bossom
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* Copyright(C) 1999,2005 Pthreads-win32 contributors
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*
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* Contact Email: rpj@callisto.canberra.edu.au
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*
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* The current list of contributors is contained
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* in the file CONTRIBUTORS included with the source
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* code distribution. The list can also be seen at the
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* following World Wide Web location:
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* http://sources.redhat.com/pthreads-win32/contributors.html
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*
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* This library is free software; you can redistribute it and/or
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* modify it under the terms of the GNU Lesser General Public
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* License as published by the Free Software Foundation; either
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* version 2 of the License, or (at your option) any later version.
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*
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* This library is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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* Lesser General Public License for more details.
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*
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* You should have received a copy of the GNU Lesser General Public
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* License along with this library in the file COPYING.LIB;
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* if not, write to the Free Software Foundation, Inc.,
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* 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA
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*/
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#include "pthread.h"
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#include "implement.h"
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int
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pthread_mutex_init (pthread_mutex_t * mutex, const pthread_mutexattr_t * attr)
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{
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int result = 0;
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pthread_mutex_t mx;
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if (mutex == NULL)
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{
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return EINVAL;
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}
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if (attr != NULL && *attr != NULL)
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{
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if ((*attr)->pshared == PTHREAD_PROCESS_SHARED)
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{
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/*
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* Creating mutex that can be shared between
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* processes.
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*/
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#if _POSIX_THREAD_PROCESS_SHARED >= 0
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/*
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* Not implemented yet.
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*/
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#error ERROR [__FILE__, line __LINE__]: Process shared mutexes are not supported yet.
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#else
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return ENOSYS;
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#endif /* _POSIX_THREAD_PROCESS_SHARED */
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}
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}
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mx = (pthread_mutex_t) calloc (1, sizeof (*mx));
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if (mx == NULL)
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{
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result = ENOMEM;
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}
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else
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{
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mx->lock_idx = 0;
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mx->recursive_count = 0;
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mx->robustNode = NULL;
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if (attr == NULL || *attr == NULL)
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{
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mx->kind = PTHREAD_MUTEX_DEFAULT;
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}
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else
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{
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mx->kind = (*attr)->kind;
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if ((*attr)->robustness == PTHREAD_MUTEX_ROBUST)
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{
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/*
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* Use the negative range to represent robust types.
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* Replaces a memory fetch with a register negate and incr
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* in pthread_mutex_lock etc.
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*
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* Map 0,1,..,n to -1,-2,..,(-n)-1
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*/
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mx->kind = -mx->kind - 1;
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mx->robustNode = (ptw32_robust_node_t*) malloc(sizeof(ptw32_robust_node_t));
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mx->robustNode->stateInconsistent = PTW32_ROBUST_CONSISTENT;
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mx->robustNode->mx = mx;
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mx->robustNode->next = NULL;
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mx->robustNode->prev = NULL;
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}
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}
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mx->ownerThread.p = NULL;
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mx->event = CreateEvent (NULL, PTW32_FALSE, /* manual reset = No */
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PTW32_FALSE, /* initial state = not signaled */
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NULL); /* event name */
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if (0 == mx->event)
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{
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result = ENOSPC;
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free (mx);
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mx = NULL;
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}
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}
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*mutex = mx;
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return (result);
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}
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