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Viewing changes to win32/3rdparty/pthreads/pthread_mutex_unlock.c

  • Committer: Bazaar Package Importer
  • Author(s): Scott Kitterman
  • Date: 2011-06-18 11:56:34 UTC
  • mfrom: (0.35.21 sid)
  • Revision ID: james.westby@ubuntu.com-20110618115634-u2lovivet0qx34d0
Tags: 0.97.1+dfsg-1ubuntu1
* Merge from debian unstable.  Remaining changes:
  - Drop build-dep on electric-fence (in Universe)
  - Add apparmor profiles for clamd and freshclam along with maintainer
    script changes

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win32/3rdparty/pthreads/pthread_mutex_unlock.c
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/*
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 * pthread_mutex_unlock.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_unlock (pthread_mutex_t * mutex)
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{
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  int result = 0;
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  pthread_mutex_t mx;
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  /*
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   * Let the system deal with invalid pointers.
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   */
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  mx = *mutex;
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  /*
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   * If the thread calling us holds the mutex then there is no
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   * race condition. If another thread holds the
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   * lock then we shouldn't be in here.
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   */
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  if (mx < PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
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    {
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      if (mx->kind == PTHREAD_MUTEX_NORMAL)
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        {
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          LONG idx;
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          idx = (LONG) PTW32_INTERLOCKED_EXCHANGE ((LPLONG) &mx->lock_idx,
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                                                   (LONG) 0);
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          if (idx != 0)
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            {
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              if (idx < 0)
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                {
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                  /*
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                   * Someone may be waiting on that mutex.
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                   */
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                  if (SetEvent (mx->event) == 0)
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                    {
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                      result = EINVAL;
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                    }
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                }
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            }
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          else
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            {
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              /*
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               * Was not locked (so can't be owned by us).
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               */
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              result = EPERM;
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            }
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        }
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      else
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        {
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          if (pthread_equal (mx->ownerThread, pthread_self ()))
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            {
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              if (mx->kind != PTHREAD_MUTEX_RECURSIVE
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                  || 0 == --mx->recursive_count)
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                {
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                  mx->ownerThread.p = NULL;
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                  if ((LONG) PTW32_INTERLOCKED_EXCHANGE ((LPLONG) &mx->lock_idx,
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                                                         (LONG) 0) < 0)
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                    {
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                      /* Someone may be waiting on that mutex */
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                      if (SetEvent (mx->event) == 0)
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                        {
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                          result = EINVAL;
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                        }
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                    }
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                }
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            }
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          else
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            {
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              result = EPERM;
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            }
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        }
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    }
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  else
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    {
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      result = EINVAL;
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    }
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  return (result);
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}