semmutex-r0drv-linux.c revision 30c84c361575629a712f338b514d9db7a8c681f4
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync/* $Id$ */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync/** @file
5b281ba489ca18f0380d7efc7a5108b606cce449vboxsync * IPRT - Mutex Semaphores, Ring-0 Driver, Linux.
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync/*
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * Copyright (C) 2006-2007 Sun Microsystems, Inc.
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync *
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * available from http://www.virtualbox.org. This file is free software;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * you can redistribute it and/or modify it under the terms of the GNU
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * General Public License (GPL) as published by the Free Software
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync *
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * The contents of this file may alternatively be used under the terms
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * of the Common Development and Distribution License Version 1.0
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * VirtualBox OSE distribution, in which case the provisions of the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * CDDL are applicable instead of those of the GPL.
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync *
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * You may elect to license modified versions of this file under the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * terms and conditions of either the GPL or the CDDL or both.
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync *
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * Clara, CA 95054 USA or visit http://www.sun.com if you need
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * additional information or have any questions.
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync/*******************************************************************************
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync* Header Files *
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync*******************************************************************************/
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync#include "the-linux-kernel.h"
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsync#include "internal/iprt.h"
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync#include <iprt/semaphore.h>
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync#include <iprt/alloc.h>
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync#include <iprt/assert.h>
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync#include <iprt/asm.h>
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync#include <iprt/err.h>
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync#include "internal/magics.h"
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync/*******************************************************************************
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync* Structures and Typedefs *
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync*******************************************************************************/
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync/**
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Linux mutex semaphore.
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsynctypedef struct RTSEMMUTEXINTERNAL
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync{
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /** Magic value (RTSEMMUTEX_MAGIC). */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync uint32_t volatile u32Magic;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /** Number of recursive locks - 0 if not owned by anyone, > 0 if owned. */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync uint32_t volatile cRecursion;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /** The wait queue. */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync wait_queue_head_t Head;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /** The current owner. */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync void * volatile pOwner;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync} RTSEMMUTEXINTERNAL, *PRTSEMMUTEXINTERNAL;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsyncRTDECL(int) RTSemMutexCreate(PRTSEMMUTEX pMutexSem)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync{
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync PRTSEMMUTEXINTERNAL pMutexInt = (PRTSEMMUTEXINTERNAL)RTMemAlloc(sizeof(*pMutexInt));
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if (pMutexInt)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync {
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync pMutexInt->u32Magic = RTSEMMUTEX_MAGIC;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync init_waitqueue_head(&pMutexInt->Head);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync *pMutexSem = pMutexInt;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsyncAssertReleaseMsgFailed(("This mutex implementation is buggy, fix it!\n"));
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return VINF_SUCCESS;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync }
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return VERR_NO_MEMORY;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync}
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsyncRT_EXPORT_SYMBOL(RTSemMutexCreate);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsyncRTDECL(int) RTSemMutexDestroy(RTSEMMUTEX MutexSem)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync{
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /*
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Validate input.
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync PRTSEMMUTEXINTERNAL pMutexInt = (PRTSEMMUTEXINTERNAL)MutexSem;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if (!pMutexInt)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return VERR_INVALID_PARAMETER;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if (pMutexInt->u32Magic != RTSEMMUTEX_MAGIC)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync {
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync AssertMsgFailed(("pMutexInt->u32Magic=%RX32 pMutexInt=%p\n", pMutexInt->u32Magic, pMutexInt));
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return VERR_INVALID_PARAMETER;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync }
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /*
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Invalidate it and signal the object just in case.
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync ASMAtomicIncU32(&pMutexInt->u32Magic);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync ASMAtomicXchgU32(&pMutexInt->cRecursion, 0);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync Assert(!waitqueue_active(&pMutexInt->Head));
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync wake_up_all(&pMutexInt->Head);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync RTMemFree(pMutexInt);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return VINF_SUCCESS;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync}
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsyncRT_EXPORT_SYMBOL(RTSemMutexDestroy);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsyncRTDECL(int) RTSemMutexRequest(RTSEMMUTEX MutexSem, unsigned cMillies)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync{
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /*
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Validate input.
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync PRTSEMMUTEXINTERNAL pMutexInt = (PRTSEMMUTEXINTERNAL)MutexSem;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if (!pMutexInt)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return VERR_INVALID_PARAMETER;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if ( !pMutexInt
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync || pMutexInt->u32Magic != RTSEMMUTEX_MAGIC)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync {
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync AssertMsgFailed(("pMutexInt->u32Magic=%RX32 pMutexInt=%p\n", pMutexInt ? pMutexInt->u32Magic : 0, pMutexInt));
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return VERR_INVALID_PARAMETER;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync }
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /*
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Check for recursive request.
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if (pMutexInt->pOwner == current)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync {
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync Assert(pMutexInt->cRecursion < 1000);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync ASMAtomicIncU32(&pMutexInt->cRecursion);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return VINF_SUCCESS;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync }
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /*
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Try aquire it.
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if (ASMAtomicCmpXchgU32(&pMutexInt->cRecursion, 1, 0))
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync {
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync ASMAtomicXchgPtr(&pMutexInt->pOwner, current);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return VINF_SUCCESS;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync }
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync else
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync {
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /*
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Ok wait for it.
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync DEFINE_WAIT(Wait);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync int rc = VINF_SUCCESS;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync long lTimeout = cMillies == RT_INDEFINITE_WAIT ? MAX_SCHEDULE_TIMEOUT : msecs_to_jiffies(cMillies);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync for (;;)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync {
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /* make everything thru schedule() atomic scheduling wise. */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync prepare_to_wait(&pMutexInt->Head, &Wait, TASK_INTERRUPTIBLE);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /* check the condition. */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if (ASMAtomicCmpXchgU32(&pMutexInt->cRecursion, 1, 0))
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync {
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync ASMAtomicXchgPtr(&pMutexInt->pOwner, current);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync break;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync }
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /* check for pending signals. */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if (signal_pending(current))
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync {
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync rc = VERR_INTERRUPTED; /** @todo VERR_INTERRUPTED isn't correct anylonger. please fix r0drv stuff! */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync break;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync }
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /* wait */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync lTimeout = schedule_timeout(lTimeout);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
30c84c361575629a712f338b514d9db7a8c681f4vboxsync after_wait(&Wait);
30c84c361575629a712f338b514d9db7a8c681f4vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /* Check if someone destroyed the semaphore while we was waiting. */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if (pMutexInt->u32Magic != RTSEMMUTEX_MAGIC)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync {
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync rc = VERR_SEM_DESTROYED;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync break;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync }
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /* check for timeout. */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if (!lTimeout)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync {
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync rc = VERR_TIMEOUT;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync break;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync }
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync }
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync finish_wait(&pMutexInt->Head, &Wait);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return rc;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync }
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return VINF_SUCCESS;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync}
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsyncRT_EXPORT_SYMBOL(RTSemMutexRequest);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsyncRTDECL(int) RTSemMutexRelease(RTSEMMUTEX MutexSem)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync{
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /*
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Validate input.
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync PRTSEMMUTEXINTERNAL pMutexInt = (PRTSEMMUTEXINTERNAL)MutexSem;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if (!pMutexInt)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return VERR_INVALID_PARAMETER;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if ( !pMutexInt
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync || pMutexInt->u32Magic != RTSEMMUTEX_MAGIC)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync {
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync AssertMsgFailed(("pMutexInt->u32Magic=%RX32 pMutexInt=%p\n", pMutexInt ? pMutexInt->u32Magic : 0, pMutexInt));
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return VERR_INVALID_PARAMETER;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync }
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if (pMutexInt->pOwner != current)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync {
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync AssertMsgFailed(("Not owner, pOwner=%p current=%p\n", (void *)pMutexInt->pOwner, (void *)current));
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return VERR_NOT_OWNER;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync }
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync /*
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync * Release the mutex.
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync */
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync if (pMutexInt->cRecursion == 1)
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync {
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync ASMAtomicXchgPtr(&pMutexInt->pOwner, NULL);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync ASMAtomicXchgU32(&pMutexInt->cRecursion, 0);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync }
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync else
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync ASMAtomicDecU32(&pMutexInt->cRecursion);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync return VINF_SUCCESS;
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync}
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsyncRT_EXPORT_SYMBOL(RTSemMutexRelease);
a8e0cb7ddfd05bcabf5e18959cf09e723f254663vboxsync