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/* $Id: semfastmutex-r0drv-darwin.cpp $ */
/** @file
* IPRT - Fast Mutex Semaphores, Ring-0 Driver, Darwin.
*/
/*
* Copyright (C) 2006-2019 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-darwin-kernel.h"
#include "internal/iprt.h"
#include <iprt/semaphore.h>
#include <iprt/assert.h>
#include <iprt/asm.h>
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
# include <iprt/asm-amd64-x86.h>
#endif
#include <iprt/errcore.h>
#include <iprt/mem.h>
#include <iprt/mp.h>
#include <iprt/thread.h>
#include "internal/magics.h"
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
/**
* Wrapper for the darwin semaphore structure.
*/
typedef struct RTSEMFASTMUTEXINTERNAL
{
/** Magic value (RTSEMFASTMUTEX_MAGIC). */
uint32_t u32Magic;
/** The mutex. */
lck_mtx_t *pMtx;
} RTSEMFASTMUTEXINTERNAL, *PRTSEMFASTMUTEXINTERNAL;
RTDECL(int) RTSemFastMutexCreate(PRTSEMFASTMUTEX phFastMtx)
{
AssertCompile(sizeof(RTSEMFASTMUTEXINTERNAL) > sizeof(void *));
AssertPtrReturn(phFastMtx, VERR_INVALID_POINTER);
RT_ASSERT_PREEMPTIBLE();
IPRT_DARWIN_SAVE_EFL_AC();
PRTSEMFASTMUTEXINTERNAL pThis = (PRTSEMFASTMUTEXINTERNAL)RTMemAlloc(sizeof(*pThis));
if (pThis)
{
pThis->u32Magic = RTSEMFASTMUTEX_MAGIC;
Assert(g_pDarwinLockGroup);
pThis->pMtx = lck_mtx_alloc_init(g_pDarwinLockGroup, LCK_ATTR_NULL);
if (pThis->pMtx)
{
*phFastMtx = pThis;
IPRT_DARWIN_RESTORE_EFL_AC();
return VINF_SUCCESS;
}
RTMemFree(pThis);
}
IPRT_DARWIN_RESTORE_EFL_AC();
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);
RT_ASSERT_INTS_ON();
IPRT_DARWIN_SAVE_EFL_AC();
ASMAtomicWriteU32(&pThis->u32Magic, RTSEMFASTMUTEX_MAGIC_DEAD);
Assert(g_pDarwinLockGroup);
lck_mtx_free(pThis->pMtx, g_pDarwinLockGroup);
pThis->pMtx = NULL;
RTMemFree(pThis);
IPRT_DARWIN_RESTORE_EFL_AC();
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);
RT_ASSERT_PREEMPTIBLE();
IPRT_DARWIN_SAVE_EFL_AC();
lck_mtx_lock(pThis->pMtx);
IPRT_DARWIN_RESTORE_EFL_ONLY_AC();
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);
RT_ASSERT_PREEMPTIBLE();
IPRT_DARWIN_SAVE_EFL_AC();
lck_mtx_unlock(pThis->pMtx);
IPRT_DARWIN_RESTORE_EFL_ONLY_AC();
return VINF_SUCCESS;
}
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