semeventmulti-r0drv-darwin.cpp revision c58f1213e628a545081c70e26c6b67a841cff880
/* $Id$ */
/** @file
* IPRT - Multiple Release Event Semaphores, Ring-0 Driver, Darwin.
*/
/*
* Copyright (C) 2006-2011 Oracle Corporation
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* 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 <iprt/semaphore.h>
#if defined(RT_ARCH_AMD64) || defined(RT_ARCH_X86)
# include <iprt/asm-amd64-x86.h>
#endif
#include <iprt/lockvalidator.h>
/*******************************************************************************
* Defined Constants And Macros *
*******************************************************************************/
/** @name fStateAndGen values
* @{ */
/** The state bit number. */
#define RTSEMEVENTMULTIDARWIN_STATE_BIT 0
/** The state mask. */
/** The generation mask. */
/** The generation shift. */
#define RTSEMEVENTMULTIDARWIN_GEN_SHIFT 1
/** The initial variable value. */
/** @} */
/*******************************************************************************
* Structures and Typedefs *
*******************************************************************************/
/**
* Darwin multiple release event semaphore.
*/
typedef struct RTSEMEVENTMULTIINTERNAL
{
/** Magic value (RTSEMEVENTMULTI_MAGIC). */
/** The object state bit and generation counter.
* The generation counter is incremented every time the object is
* signalled. */
uint32_t volatile fStateAndGen;
/** Reference counter. */
/** Set if there are blocked threads. */
bool volatile fHaveBlockedThreads;
/** The spinlock protecting us. */
{
}
RTDECL(int) RTSemEventMultiCreateEx(PRTSEMEVENTMULTI phEventMultiSem, uint32_t fFlags, RTLOCKVALCLASS hClass,
const char *pszNameFmt, ...)
{
AssertCompile(sizeof(RTSEMEVENTMULTIINTERNAL) > sizeof(void *));
if (pThis)
{
pThis->fHaveBlockedThreads = false;
{
*phEventMultiSem = pThis;
return VINF_SUCCESS;
}
}
return VERR_NO_MEMORY;
}
/**
* Retain a reference to the semaphore.
*
* @param pThis The semaphore.
*/
{
}
/**
* Release a reference, destroy the thing if necessary.
*
* @param pThis The semaphore.
*/
{
{
}
}
{
if (pThis == NIL_RTSEMEVENTMULTI)
return VINF_SUCCESS;
AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
if (pThis->fHaveBlockedThreads)
{
/* abort waiting threads. */
}
return VINF_SUCCESS;
}
{
AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
/*
* Set the signal and increment the generation counter.
*/
/*
* Wake up all sleeping threads.
*/
if (pThis->fHaveBlockedThreads)
{
}
return VINF_SUCCESS;
}
{
AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
return VINF_SUCCESS;
}
/**
* Worker for RTSemEventMultiWaitEx and RTSemEventMultiWaitExDebug.
*
* @returns VBox status code.
* @param pThis The event semaphore.
* @param fFlags See RTSemEventMultiWaitEx.
* @param uTimeout See RTSemEventMultiWaitEx.
* @param pSrcPos The source code position of the wait.
*/
static int rtR0SemEventMultiDarwinWait(PRTSEMEVENTMULTIINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
{
/*
* Validate input.
*/
AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("pThis=%p u32Magic=%#x\n", pThis, pThis->u32Magic), VERR_INVALID_HANDLE);
/*
* Is the event already signalled or do we have to wait?
*/
int rc;
rc = VINF_SUCCESS;
else
{
/*
* We have to wait. So, we'll need to convert the timeout and figure
* out if it's indefinite or not.
*/
if (!(fFlags & RTSEMWAIT_FLAGS_INDEFINITE))
{
if (fFlags & RTSEMWAIT_FLAGS_MILLISECS)
: UINT64_MAX;
if (uTimeout == UINT64_MAX)
else
{
if (fFlags & RTSEMWAIT_FLAGS_RELATIVE)
{
if (uTimeout != 0)
{
u64Now = RTTimeSystemNanoTS();
}
}
else
{
u64Now = RTTimeSystemNanoTS();
}
}
}
if ( !(fFlags & RTSEMWAIT_FLAGS_INDEFINITE)
&& uTimeout == 0)
{
/*
* Poll call, we already checked the condition above so no need to
* wait for anything.
*/
rc = VERR_TIMEOUT;
}
else
{
for (;;)
{
/*
* Do the actual waiting.
*/
wait_interrupt_t fInterruptible = fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE ? THREAD_ABORTSAFE : THREAD_UNINT;
if (fFlags & RTSEMWAIT_FLAGS_INDEFINITE)
else
{
}
/*
* Deal with the wait result.
*/
{
switch (rcWait)
{
case THREAD_AWAKENED:
rc = VINF_SUCCESS;
else if (fFlags & RTSEMWAIT_FLAGS_INTERRUPTIBLE)
else
break;
case THREAD_TIMED_OUT:
rc = VERR_TIMEOUT;
break;
case THREAD_INTERRUPTED:
break;
case THREAD_RESTART:
break;
default:
break;
}
}
else
break;
}
}
}
return rc;
}
RTDECL(int) RTSemEventMultiWaitEx(RTSEMEVENTMULTI hEventMultiSem, uint32_t fFlags, uint64_t uTimeout)
{
#ifndef RTSEMEVENT_STRICT
#else
#endif
}
RTDECL(int) RTSemEventMultiWaitExDebug(RTSEMEVENTMULTI hEventMultiSem, uint32_t fFlags, uint64_t uTimeout,
{
}
{
}