| /* |
| * pthread_mutex_unlock.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_unlock (pthread_mutex_t * mutex) |
| { |
| int result = 0; |
| int kind; |
| pthread_mutex_t mx; |
| |
| /* |
| * Let the system deal with invalid pointers. |
| */ |
| |
| mx = *mutex; |
| |
| /* |
| * If the thread calling us holds the mutex then there is no |
| * race condition. If another thread holds the |
| * lock then we shouldn't be in here. |
| */ |
| if (mx < PTHREAD_ERRORCHECK_MUTEX_INITIALIZER) |
| { |
| kind = mx->kind; |
| |
| if (kind >= 0) |
| { |
| if (kind == PTHREAD_MUTEX_NORMAL) |
| { |
| LONG idx; |
| |
| idx = (LONG) PTW32_INTERLOCKED_EXCHANGE_LONG ((PTW32_INTERLOCKED_LONGPTR)&mx->lock_idx, |
| (PTW32_INTERLOCKED_LONG)0); |
| if (idx != 0) |
| { |
| if (idx < 0) |
| { |
| /* |
| * Someone may be waiting on that mutex. |
| */ |
| if (SetEvent (mx->event) == 0) |
| { |
| result = EINVAL; |
| } |
| } |
| } |
| } |
| else |
| { |
| if (pthread_equal (mx->ownerThread, pthread_self())) |
| { |
| if (kind != PTHREAD_MUTEX_RECURSIVE |
| || 0 == --mx->recursive_count) |
| { |
| mx->ownerThread.p = NULL; |
| |
| if ((LONG) PTW32_INTERLOCKED_EXCHANGE_LONG ((PTW32_INTERLOCKED_LONGPTR)&mx->lock_idx, |
| (PTW32_INTERLOCKED_LONG)0) < 0L) |
| { |
| /* Someone may be waiting on that mutex */ |
| if (SetEvent (mx->event) == 0) |
| { |
| result = EINVAL; |
| } |
| } |
| } |
| } |
| else |
| { |
| result = EPERM; |
| } |
| } |
| } |
| else |
| { |
| /* Robust types */ |
| pthread_t self = pthread_self(); |
| kind = -kind - 1; /* Convert to non-robust range */ |
| |
| /* |
| * The thread must own the lock regardless of type if the mutex |
| * is robust. |
| */ |
| if (pthread_equal (mx->ownerThread, self)) |
| { |
| PTW32_INTERLOCKED_COMPARE_EXCHANGE_LONG((PTW32_INTERLOCKED_LONGPTR) &mx->robustNode->stateInconsistent, |
| (PTW32_INTERLOCKED_LONG)PTW32_ROBUST_NOTRECOVERABLE, |
| (PTW32_INTERLOCKED_LONG)PTW32_ROBUST_INCONSISTENT); |
| if (PTHREAD_MUTEX_NORMAL == kind) |
| { |
| ptw32_robust_mutex_remove(mutex, NULL); |
| |
| if ((LONG) PTW32_INTERLOCKED_EXCHANGE_LONG((PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx, |
| (PTW32_INTERLOCKED_LONG) 0) < 0) |
| { |
| /* |
| * Someone may be waiting on that mutex. |
| */ |
| if (SetEvent (mx->event) == 0) |
| { |
| result = EINVAL; |
| } |
| } |
| } |
| else |
| { |
| if (kind != PTHREAD_MUTEX_RECURSIVE |
| || 0 == --mx->recursive_count) |
| { |
| ptw32_robust_mutex_remove(mutex, NULL); |
| |
| if ((LONG) PTW32_INTERLOCKED_EXCHANGE_LONG((PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx, |
| (PTW32_INTERLOCKED_LONG) 0) < 0) |
| { |
| /* |
| * Someone may be waiting on that mutex. |
| */ |
| if (SetEvent (mx->event) == 0) |
| { |
| result = EINVAL; |
| } |
| } |
| } |
| } |
| } |
| else |
| { |
| result = EPERM; |
| } |
| } |
| } |
| else if (mx != PTHREAD_MUTEX_INITIALIZER) |
| { |
| result = EINVAL; |
| } |
| |
| return (result); |
| } |