semfastmutex-r0drv-haiku.c revision 9fc464631dc4a68fbb5eb6419d61fbe91b6b16bd
/* $Id$ */
/** @file
* IPRT - Fast Mutex Semaphores, Ring-0 Driver, Haiku.
*/
/*
* Copyright (C) 2012 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#include "the-haiku-kernel.h"
#include <iprt/semaphore.h>
#include <iprt/err.h>
#include <iprt/alloc.h>
#include <iprt/assert.h>
#include <iprt/asm.h>
#include "internal/magics.h"
/*******************************************************************************
* Structures and Typedefs *
*******************************************************************************/
/**
* Wrapper for the Haiku (sleep) mutex.
*/
typedef struct RTSEMFASTMUTEXINTERNAL
{
/** Magic value (RTSEMFASTMUTEX_MAGIC). */
uint32_t u32Magic;
/** A good old Benaphore. */
vint32 BenId;
sem_id SemId;
} RTSEMFASTMUTEXINTERNAL, *PRTSEMFASTMUTEXINTERNAL;
RTDECL(int) RTSemFastMutexCreate(PRTSEMFASTMUTEX phFastMtx)
{
AssertCompile(sizeof(RTSEMFASTMUTEXINTERNAL) > sizeof(void *));
AssertPtrReturn(phFastMtx, VERR_INVALID_POINTER);
PRTSEMFASTMUTEXINTERNAL pThis = (PRTSEMFASTMUTEXINTERNAL)RTMemAllocZ(sizeof(*pThis));
if (RT_UNLIKELY(!pThis))
return VERR_NO_MEMORY;
pThis->u32Magic = RTSEMFASTMUTEX_MAGIC;
pThis->BenId = 0;
pThis->SemId = create_sem(0, "IPRT Fast Mutex Semaphore");
if (pThis->SemId >= B_OK)
{
*phFastMtx = pThis;
return VINF_SUCCESS;
}
RTMemFree(pThis);
return VERR_TOO_MANY_SEMAPHORES; /** @todo r=ramshankar: use RTErrConvertFromHaikuKernReturn */
}
RTDECL(int) RTSemFastMutexDestroy(RTSEMFASTMUTEX hFastMtx)
{
PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx;
if (pThis == NIL_RTSEMFASTMUTEX)
return VINF_SUCCESS;
AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
ASMAtomicWriteU32(&pThis->u32Magic, RTSEMFASTMUTEX_MAGIC_DEAD);
delete_sem(pThis->SemId);
RTMemFree(pThis);
return VINF_SUCCESS;
}
RTDECL(int) RTSemFastMutexRequest(RTSEMFASTMUTEX hFastMtx)
{
PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx;
AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
if (atomic_add(&pThis->BenId, 1) > 0)
acquire_sem(pThis->SemId);
return VINF_SUCCESS;
}
RTDECL(int) RTSemFastMutexRelease(RTSEMFASTMUTEX hFastMtx)
{
PRTSEMFASTMUTEXINTERNAL pThis = hFastMtx;
AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
AssertMsgReturn(pThis->u32Magic == RTSEMFASTMUTEX_MAGIC, ("%p: u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
if (atomic_add(&pThis->BenId, -1) > 1)
release_sem(pThis->SemId);
return VINF_SUCCESS;
}