| /* |
| * pthread_mutex_init.c |
| * |
| * Description: |
| * This translation unit implements mutual exclusion (mutex) primitives. |
| * |
| * -------------------------------------------------------------------------- |
| * |
| * Pthreads-win32 - POSIX Threads Library for Win32 |
| * Copyright(C) 1998 John E. Bossom |
| * Copyright(C) 1999,2005 Pthreads-win32 contributors |
| * |
| * Contact Email: rpj@callisto.canberra.edu.au |
| * |
| * 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: |
| * http://sources.redhat.com/pthreads-win32/contributors.html |
| * |
| * This library is free software; you can redistribute it and/or |
| * modify it under the terms of the GNU Lesser General Public |
| * License as published by the Free Software Foundation; either |
| * version 2 of the License, or (at your option) any later version. |
| * |
| * This library 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 |
| * Lesser General Public License for more details. |
| * |
| * You should have received a copy of the GNU Lesser General Public |
| * License along with this library in the file COPYING.LIB; |
| * if not, write to the Free Software Foundation, Inc., |
| * 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA |
| */ |
| |
| #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)); |
| mx->robustNode->stateInconsistent = PTW32_ROBUST_CONSISTENT; |
| mx->robustNode->mx = mx; |
| mx->robustNode->next = NULL; |
| mx->robustNode->prev = NULL; |
| } |
| } |
| |
| mx->ownerThread.p = NULL; |
| |
| mx->event = CreateEvent (NULL, PTW32_FALSE, /* manual reset = No */ |
| PTW32_FALSE, /* initial state = not signaled */ |
| NULL); /* event name */ |
| |
| if (0 == mx->event) |
| { |
| result = ENOSPC; |
| free (mx); |
| mx = NULL; |
| } |
| } |
| |
| *mutex = mx; |
| |
| return (result); |
| } |