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/* $Id: semfastmutex-r0drv-freebsd.c $ */
/** @file
* IPRT - Fast Mutex Semaphores, Ring-0 Driver, FreeBSD.
*/
/*
* Contributed by knut st. osmundsen.
*
* Copyright (C) 2007-2023 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program 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
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
* --------------------------------------------------------------------
*
* This code is based on:
*
* Copyright (c) 2007 knut st. osmundsen <bird-src-spam@anduin.net>
*
* Permission is hereby granted, free of charge, to any person
* obtaining a copy of this software and associated documentation
* files (the "Software"), to deal in the Software without
* restriction, including without limitation the rights to use,
* copy, modify, merge, publish, distribute, sublicense, and/or sell
* copies of the Software, and to permit persons to whom the
* Software is furnished to do so, subject to the following
* conditions:
*
* The above copyright notice and this permission notice shall be
* included in all copies or substantial portions of the Software.
*
* THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
* EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES
* OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND
* NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT
* HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
* WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING
* FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
* OTHER DEALINGS IN THE SOFTWARE.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#include "the-freebsd-kernel.h"
#include <iprt/semaphore.h>
#include <iprt/errcore.h>
#include <iprt/alloc.h>
#include <iprt/assert.h>
#include <iprt/asm.h>
#include "internal/magics.h"
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
/**
* Wrapper for the FreeBSD (sleep) mutex.
*/
typedef struct RTSEMFASTMUTEXINTERNAL
{
/** Magic value (RTSEMFASTMUTEX_MAGIC). */
uint32_t u32Magic;
/** The FreeBSD shared/exclusive lock mutex. */
struct sx SxLock;
} RTSEMFASTMUTEXINTERNAL, *PRTSEMFASTMUTEXINTERNAL;
RTDECL(int) RTSemFastMutexCreate(PRTSEMFASTMUTEX phFastMtx)
{
AssertCompile(sizeof(RTSEMFASTMUTEXINTERNAL) > sizeof(void *));
AssertPtrReturn(phFastMtx, VERR_INVALID_POINTER);
PRTSEMFASTMUTEXINTERNAL pThis = (PRTSEMFASTMUTEXINTERNAL)RTMemAllocZ(sizeof(*pThis));
if (pThis)
{
pThis->u32Magic = RTSEMFASTMUTEX_MAGIC;
sx_init_flags(&pThis->SxLock, "IPRT Fast Mutex Semaphore", SX_DUPOK);
*phFastMtx = pThis;
return VINF_SUCCESS;
}
return VERR_NO_MEMORY;
}
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);
sx_destroy(&pThis->SxLock);
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);
sx_xlock(&pThis->SxLock);
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);
sx_xunlock(&pThis->SxLock);
return VINF_SUCCESS;
}
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