mirror of https://github.com/PCSX2/pcsx2.git
270 lines
9.2 KiB
C
270 lines
9.2 KiB
C
|
/*
|
||
|
|
* pthread_mutex_lock.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
|
||
|
|
*/
|
||
|
|
|
||
|
|
#if !defined(_UWIN)
|
||
|
|
/*# include <process.h> */
|
||
|
|
#endif
|
||
|
|
#include "pthread.h"
|
||
|
|
#include "implement.h"
|
||
|
|
|
||
|
|
int
|
||
|
|
pthread_mutex_lock (pthread_mutex_t * mutex)
|
||
|
|
{
|
||
|
|
int kind;
|
||
|
|
pthread_mutex_t mx;
|
||
|
|
int result = 0;
|
||
|
|
|
||
|
|
/*
|
||
|
|
* Let the system deal with invalid pointers.
|
||
|
|
*/
|
||
|
|
if (*mutex == NULL)
|
||
|
|
{
|
||
|
|
return EINVAL;
|
||
|
|
}
|
||
|
|
|
||
|
|
/*
|
||
|
|
* We do a quick check to see if we need to do more work
|
||
|
|
* to initialise a static mutex. We check
|
||
|
|
* again inside the guarded section of ptw32_mutex_check_need_init()
|
||
|
|
* to avoid race conditions.
|
||
|
|
*/
|
||
|
|
if (*mutex >= PTHREAD_ERRORCHECK_MUTEX_INITIALIZER)
|
||
|
|
{
|
||
|
|
if ((result = ptw32_mutex_check_need_init (mutex)) != 0)
|
||
|
|
{
|
||
|
|
return (result);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
mx = *mutex;
|
||
|
|
kind = mx->kind;
|
||
|
|
|
||
|
|
if (kind >= 0)
|
||
|
|
{
|
||
|
|
/* Non-robust */
|
||
|
|
if (PTHREAD_MUTEX_NORMAL == kind)
|
||
|
|
{
|
||
|
|
if ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_EXCHANGE_LONG(
|
||
|
|
(PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
|
||
|
|
(PTW32_INTERLOCKED_LONG) 1) != 0)
|
||
|
|
{
|
||
|
|
while ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_EXCHANGE_LONG(
|
||
|
|
(PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
|
||
|
|
(PTW32_INTERLOCKED_LONG) -1) != 0)
|
||
|
|
{
|
||
|
|
if (WAIT_OBJECT_0 != WaitForSingleObject (mx->event, INFINITE))
|
||
|
|
{
|
||
|
|
result = EINVAL;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
pthread_t self = pthread_self();
|
||
|
|
|
||
|
|
if ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_COMPARE_EXCHANGE_LONG(
|
||
|
|
(PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
|
||
|
|
(PTW32_INTERLOCKED_LONG) 1,
|
||
|
|
(PTW32_INTERLOCKED_LONG) 0) == 0)
|
||
|
|
{
|
||
|
|
mx->recursive_count = 1;
|
||
|
|
mx->ownerThread = self;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (pthread_equal (mx->ownerThread, self))
|
||
|
|
{
|
||
|
|
if (kind == PTHREAD_MUTEX_RECURSIVE)
|
||
|
|
{
|
||
|
|
mx->recursive_count++;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
result = EDEADLK;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
while ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_EXCHANGE_LONG(
|
||
|
|
(PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
|
||
|
|
(PTW32_INTERLOCKED_LONG) -1) != 0)
|
||
|
|
{
|
||
|
|
if (WAIT_OBJECT_0 != WaitForSingleObject (mx->event, INFINITE))
|
||
|
|
{
|
||
|
|
result = EINVAL;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (0 == result)
|
||
|
|
{
|
||
|
|
mx->recursive_count = 1;
|
||
|
|
mx->ownerThread = self;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* Robust types
|
||
|
|
* All types record the current owner thread.
|
||
|
|
* The mutex is added to a per thread list when ownership is acquired.
|
||
|
|
*/
|
||
|
|
ptw32_robust_state_t* statePtr = &mx->robustNode->stateInconsistent;
|
||
|
|
|
||
|
|
if ((PTW32_INTERLOCKED_LONG)PTW32_ROBUST_NOTRECOVERABLE == PTW32_INTERLOCKED_EXCHANGE_ADD_LONG(
|
||
|
|
(PTW32_INTERLOCKED_LONGPTR)statePtr,
|
||
|
|
(PTW32_INTERLOCKED_LONG)0))
|
||
|
|
{
|
||
|
|
result = ENOTRECOVERABLE;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
pthread_t self = pthread_self();
|
||
|
|
|
||
|
|
kind = -kind - 1; /* Convert to non-robust range */
|
||
|
|
|
||
|
|
if (PTHREAD_MUTEX_NORMAL == kind)
|
||
|
|
{
|
||
|
|
if ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_EXCHANGE_LONG(
|
||
|
|
(PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
|
||
|
|
(PTW32_INTERLOCKED_LONG) 1) != 0)
|
||
|
|
{
|
||
|
|
while (0 == (result = ptw32_robust_mutex_inherit(mutex))
|
||
|
|
&& (PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_EXCHANGE_LONG(
|
||
|
|
(PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
|
||
|
|
(PTW32_INTERLOCKED_LONG) -1) != 0)
|
||
|
|
{
|
||
|
|
if (WAIT_OBJECT_0 != WaitForSingleObject (mx->event, INFINITE))
|
||
|
|
{
|
||
|
|
result = EINVAL;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if ((PTW32_INTERLOCKED_LONG)PTW32_ROBUST_NOTRECOVERABLE ==
|
||
|
|
PTW32_INTERLOCKED_EXCHANGE_ADD_LONG(
|
||
|
|
(PTW32_INTERLOCKED_LONGPTR)statePtr,
|
||
|
|
(PTW32_INTERLOCKED_LONG)0))
|
||
|
|
{
|
||
|
|
/* Unblock the next thread */
|
||
|
|
SetEvent(mx->event);
|
||
|
|
result = ENOTRECOVERABLE;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
if (0 == result || EOWNERDEAD == result)
|
||
|
|
{
|
||
|
|
/*
|
||
|
|
* Add mutex to the per-thread robust mutex currently-held list.
|
||
|
|
* If the thread terminates, all mutexes in this list will be unlocked.
|
||
|
|
*/
|
||
|
|
ptw32_robust_mutex_add(mutex, self);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if ((PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_COMPARE_EXCHANGE_LONG(
|
||
|
|
(PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
|
||
|
|
(PTW32_INTERLOCKED_LONG) 1,
|
||
|
|
(PTW32_INTERLOCKED_LONG) 0) == 0)
|
||
|
|
{
|
||
|
|
mx->recursive_count = 1;
|
||
|
|
/*
|
||
|
|
* Add mutex to the per-thread robust mutex currently-held list.
|
||
|
|
* If the thread terminates, all mutexes in this list will be unlocked.
|
||
|
|
*/
|
||
|
|
ptw32_robust_mutex_add(mutex, self);
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
if (pthread_equal (mx->ownerThread, self))
|
||
|
|
{
|
||
|
|
if (PTHREAD_MUTEX_RECURSIVE == kind)
|
||
|
|
{
|
||
|
|
mx->recursive_count++;
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
result = EDEADLK;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
else
|
||
|
|
{
|
||
|
|
while (0 == (result = ptw32_robust_mutex_inherit(mutex))
|
||
|
|
&& (PTW32_INTERLOCKED_LONG) PTW32_INTERLOCKED_EXCHANGE_LONG(
|
||
|
|
(PTW32_INTERLOCKED_LONGPTR) &mx->lock_idx,
|
||
|
|
(PTW32_INTERLOCKED_LONG) -1) != 0)
|
||
|
|
{
|
||
|
|
if (WAIT_OBJECT_0 != WaitForSingleObject (mx->event, INFINITE))
|
||
|
|
{
|
||
|
|
result = EINVAL;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
if ((PTW32_INTERLOCKED_LONG)PTW32_ROBUST_NOTRECOVERABLE ==
|
||
|
|
PTW32_INTERLOCKED_EXCHANGE_ADD_LONG(
|
||
|
|
(PTW32_INTERLOCKED_LONGPTR)statePtr,
|
||
|
|
(PTW32_INTERLOCKED_LONG)0))
|
||
|
|
{
|
||
|
|
/* Unblock the next thread */
|
||
|
|
SetEvent(mx->event);
|
||
|
|
result = ENOTRECOVERABLE;
|
||
|
|
break;
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
if (0 == result || EOWNERDEAD == result)
|
||
|
|
{
|
||
|
|
mx->recursive_count = 1;
|
||
|
|
/*
|
||
|
|
* Add mutex to the per-thread robust mutex currently-held list.
|
||
|
|
* If the thread terminates, all mutexes in this list will be unlocked.
|
||
|
|
*/
|
||
|
|
ptw32_robust_mutex_add(mutex, self);
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
}
|
||
|
|
|
||
|
|
return (result);
|
||
|
|
}
|
||
|
|
|