semeventmulti-r0drv-linux.c revision 715e49c31b15c23c17a9ce3be42a75e7c48d4b78
/* $Id$ */
/** @file
* IPRT - Multiple Release Event Semaphores, Ring-0 Driver, Linux.
*/
/*
* Copyright (C) 2006-2010 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-linux-kernel.h"
#include <iprt/semaphore.h>
#include <iprt/lockvalidator.h>
#include "waitqueue-r0drv-linux.h"
/*******************************************************************************
* Defined Constants And Macros *
*******************************************************************************/
/** @name fStateAndGen values
* @{ */
/** The state bit number. */
#define RTSEMEVENTMULTILNX_STATE_BIT 0
/** The state mask. */
/** The generation mask. */
/** The generation shift. */
#define RTSEMEVENTMULTILNX_GEN_SHIFT 1
/** The initial variable value. */
/** @} */
/*******************************************************************************
* Structures and Typedefs *
*******************************************************************************/
/**
* Linux 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. */
/** The wait queue. */
{
}
RTDECL(int) RTSemEventMultiCreateEx(PRTSEMEVENTMULTI phEventMultiSem, uint32_t fFlags, RTLOCKVALCLASS hClass,
const char *pszNameFmt, ...)
{
if (pThis)
{
*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.
*/
{
{
}
}
{
/*
* Validate input.
*/
if (pThis == NIL_RTSEMEVENTMULTI)
return VINF_SUCCESS;
AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
/*
* Invalidate it and signal the object just in case.
*/
return VINF_SUCCESS;
}
{
/*
* Validate input.
*/
if (!pThis)
return VERR_INVALID_PARAMETER;
AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
/*
* Signal the event object. The cause of the paranoia here is racing to try
* deal with racing RTSemEventMultiSignal calls (should probably be
* forbidden, but it's relatively easy to handle).
*/
do
{
}
return VINF_SUCCESS;
}
{
/*
* Validate input.
*/
if (!pThis)
return VERR_INVALID_PARAMETER;
AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
/*
* Reset it.
*/
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 rtR0SemEventMultiLnxWait(PRTSEMEVENTMULTIINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
{
int rc;
/*
* Validate the input.
*/
AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
/*
* Is the event already signalled or do we have to wait?
*/
rc = VINF_SUCCESS;
else
{
/*
* We have to wait.
*/
if (RT_SUCCESS(rc))
{
for (;;)
{
/* The destruction test. */
else
{
/* Check the exit conditions. */
rc = VINF_SUCCESS;
else if (rtR0SemLnxWaitHasTimedOut(&Wait))
rc = VERR_TIMEOUT;
else if (rtR0SemLnxWaitWasInterrupted(&Wait))
else
{
/* Do the wait and then recheck the conditions. */
continue;
}
}
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,
{
}
{
return rtR0SemLnxWaitGetResolution();
}