r0drv/linux/semeventmulti-r0drv-linux.c

	semeventmulti-r0drv-linux.c revision d1c36fd86d36726777e3d6f9d040573e0aaf30de
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/* $Id$ */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/** @file
5b281ba489ca18f0380d7efc7a5108b606cce449vboxsync * IPRT - Multiple Release Event Semaphores, Ring-0 Driver, Linux.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/*
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * Copyright (C) 2006-2010 Oracle Corporation
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync *
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * available from http://www.virtualbox.org. This file is free software;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * you can redistribute it and/or modify it under the terms of the GNU
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * General Public License (GPL) as published by the Free Software
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync *
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * The contents of this file may alternatively be used under the terms
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * of the Common Development and Distribution License Version 1.0
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * VirtualBox OSE distribution, in which case the provisions of the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * CDDL are applicable instead of those of the GPL.
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync *
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * You may elect to license modified versions of this file under the
a16eb14ad7a4b5ef91ddc22d3e8e92d930f736fcvboxsync * terms and conditions of either the GPL or the CDDL or both.
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync */
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync/*******************************************************************************
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync*   Header Files                                                               *
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync*******************************************************************************/
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include "the-linux-kernel.h"
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include "internal/iprt.h"
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include <iprt/semaphore.h>
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include <iprt/assert.h>
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsync#include <iprt/asm.h>
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include <iprt/err.h>
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include <iprt/mem.h>
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include <iprt/lockvalidator.h>
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include "waitqueue-r0drv-linux.h"
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include "internal/magics.h"
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/*******************************************************************************
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync*   Defined Constants And Macros                                               *
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync*******************************************************************************/
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/** @name fStateAndGen values
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @{ */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/** The state bit number. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#define RTSEMEVENTMULTILNX_STATE_BIT        0
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/** The state mask. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#define RTSEMEVENTMULTILNX_STATE_MASK       RT_BIT_32(RTSEMEVENTMULTILNX_STATE_BIT)
9197680d465154232353e065bfc7e7b0fe026b97vboxsync/** The generation mask. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#define RTSEMEVENTMULTILNX_GEN_MASK         ~RTSEMEVENTMULTILNX_STATE_MASK
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/** The generation shift. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#define RTSEMEVENTMULTILNX_GEN_SHIFT        1
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/** The initial variable value. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#define RTSEMEVENTMULTILNX_STATE_GEN_INIT   UINT32_C(0xfffffffc)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/** @}  */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/*******************************************************************************
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync*   Structures and Typedefs                                                    *
ab93606043a9881487aa83be04191d2f4ea24071vboxsync*******************************************************************************/
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/**
ab93606043a9881487aa83be04191d2f4ea24071vboxsync * Linux event semaphore.
ab93606043a9881487aa83be04191d2f4ea24071vboxsync */
ab93606043a9881487aa83be04191d2f4ea24071vboxsynctypedef struct RTSEMEVENTMULTIINTERNAL
ab93606043a9881487aa83be04191d2f4ea24071vboxsync{
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    /** Magic value (RTSEMEVENTMULTI_MAGIC). */
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    uint32_t volatile   u32Magic;
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    /** The object state bit and generation counter.
29c2b5255de6d54cace83d114cc1ada61afd1047vboxsync     * The generation counter is incremented every time the object is   */
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    uint32_t volatile   fStateAndGen;
29c2b5255de6d54cace83d114cc1ada61afd1047vboxsync    /** Reference counter. */
29c2b5255de6d54cace83d114cc1ada61afd1047vboxsync    uint32_t volatile   cRefs;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /** The wait queue. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    wait_queue_head_t   Head;
9197680d465154232353e065bfc7e7b0fe026b97vboxsync} RTSEMEVENTMULTIINTERNAL, *PRTSEMEVENTMULTIINTERNAL;
9affb448a727f72781223de5f4c9b09bd3a0ad6fvboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
ab93606043a9881487aa83be04191d2f4ea24071vboxsync
ab93606043a9881487aa83be04191d2f4ea24071vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int)  RTSemEventMultiCreate(PRTSEMEVENTMULTI phEventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    return RTSemEventMultiCreateEx(phEventMultiSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsync}
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
ab93606043a9881487aa83be04191d2f4ea24071vboxsyncRTDECL(int)  RTSemEventMultiCreateEx(PRTSEMEVENTMULTI phEventMultiSem, uint32_t fFlags, RTLOCKVALCLASS hClass,
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync                                     const char *pszNameFmt, ...)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    PRTSEMEVENTMULTIINTERNAL pThis;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    AssertReturn(!(fFlags & ~RTSEMEVENTMULTI_FLAGS_NO_LOCK_VAL), VERR_INVALID_PARAMETER);
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    pThis = (PRTSEMEVENTMULTIINTERNAL)RTMemAlloc(sizeof(*pThis));
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    if (pThis)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    {
9197680d465154232353e065bfc7e7b0fe026b97vboxsync        pThis->u32Magic     = RTSEMEVENTMULTI_MAGIC;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        pThis->fStateAndGen = RTSEMEVENTMULTILNX_STATE_GEN_INIT;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        pThis->cRefs        = 1;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        init_waitqueue_head(&pThis->Head);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
ab93606043a9881487aa83be04191d2f4ea24071vboxsync        *phEventMultiSem = pThis;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        return VINF_SUCCESS;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    }
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    return VERR_NO_MEMORY;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRT_EXPORT_SYMBOL(RTSemEventMultiCreate);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/**
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * Retain a reference to the semaphore.
ab93606043a9881487aa83be04191d2f4ea24071vboxsync *
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @param   pThis       The semaphore.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncDECLINLINE(void) rtR0SemEventMultiLnxRetain(PRTSEMEVENTMULTIINTERNAL pThis)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    Assert(cRefs && cRefs < 100000);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
9197680d465154232353e065bfc7e7b0fe026b97vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/**
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * Release a reference, destroy the thing if necessary.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync *
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @param   pThis       The semaphore.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncDECLINLINE(void) rtR0SemEventMultiLnxRelease(PRTSEMEVENTMULTIINTERNAL pThis)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    if (RT_UNLIKELY(ASMAtomicDecU32(&pThis->cRefs) == 0))
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsync    {
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        Assert(pThis->u32Magic != RTSEMEVENTMULTI_MAGIC);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        RTMemFree(pThis);
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    }
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int) RTSemEventMultiDestroy(RTSEMEVENTMULTI hEventMultiSem)
ab93606043a9881487aa83be04191d2f4ea24071vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Validate input.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
9197680d465154232353e065bfc7e7b0fe026b97vboxsync    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)hEventMultiSem;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    if (pThis == NIL_RTSEMEVENTMULTI)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        return VINF_SUCCESS;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    Assert(pThis->cRefs > 0);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsync     * Invalidate it and signal the object just in case.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMEVENTMULTI_MAGIC);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    ASMAtomicAndU32(&pThis->fStateAndGen, RTSEMEVENTMULTILNX_GEN_MASK);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    Assert(!waitqueue_active(&pThis->Head));
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    wake_up_all(&pThis->Head);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    return VINF_SUCCESS;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRT_EXPORT_SYMBOL(RTSemEventMultiDestroy);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
b79e4344bf4eb8033fd06d560cd864192728bd0bvboxsyncRTDECL(int) RTSemEventMultiSignal(RTSEMEVENTMULTI hEventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    uint32_t fNew;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    uint32_t fOld;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Validate input.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)hEventMultiSem;
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync    if (!pThis)
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync        return VERR_INVALID_PARAMETER;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    rtR0SemEventMultiLnxRetain(pThis);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Signal the event object.  The cause of the parnoia here is racing to try
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * deal with racing RTSemEventMultiSignal calls (should probably be
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * forbidden, but it's relatively easy to handle).
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    do
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    {
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        fNew = fOld = ASMAtomicUoReadU32(&pThis->fStateAndGen);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        fNew += 1 << RTSEMEVENTMULTILNX_GEN_SHIFT;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        fNew |= RTSEMEVENTMULTILNX_STATE_MASK;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    }
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    while (!ASMAtomicCmpXchgU32(&pThis->fStateAndGen, fNew, fOld));
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    wake_up_all(&pThis->Head);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
30c84c361575629a712f338b514d9db7a8c681f4vboxsync    rtR0SemEventMultiLnxRelease(pThis);
30c84c361575629a712f338b514d9db7a8c681f4vboxsync    return VINF_SUCCESS;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
9197680d465154232353e065bfc7e7b0fe026b97vboxsyncRT_EXPORT_SYMBOL(RTSemEventMultiSignal);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int) RTSemEventMultiReset(RTSEMEVENTMULTI hEventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Validate input.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)hEventMultiSem;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    if (!pThis)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        return VERR_INVALID_PARAMETER;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    rtR0SemEventMultiLnxRetain(pThis);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync    /*
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync     * Reset it.
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync     */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    ASMAtomicAndU32(&pThis->fStateAndGen, ~RTSEMEVENTMULTILNX_STATE_MASK);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    rtR0SemEventMultiLnxRelease(pThis);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    return VINF_SUCCESS;
b79e4344bf4eb8033fd06d560cd864192728bd0bvboxsync}
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRT_EXPORT_SYMBOL(RTSemEventMultiReset);
ab93606043a9881487aa83be04191d2f4ea24071vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/**
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * Worker for RTSemEventMultiWaitEx and RTSemEventMultiWaitExDebug.
9197680d465154232353e065bfc7e7b0fe026b97vboxsync *
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @returns VBox status code.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @param   pThis           The event semaphore.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync */
98ead928220b4ddc6626c581287987ae2416ba35vboxsyncstatic int rtR0SemEventMultiLnxWait(PRTSEMEVENTMULTIINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync                                    PCRTLOCKVALSRCPOS pSrcPos)
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    uint32_t    fOrgStateAndGen;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    int         rc;
b79e4344bf4eb8033fd06d560cd864192728bd0bvboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
ab93606043a9881487aa83be04191d2f4ea24071vboxsync     * Validate the input.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
9197680d465154232353e065bfc7e7b0fe026b97vboxsync    rtR0SemEventMultiLnxRetain(pThis);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Is the event already signalled or do we have to wait?
98ead928220b4ddc6626c581287987ae2416ba35vboxsync     */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    fOrgStateAndGen = ASMAtomicUoReadU32(&pThis->fStateAndGen);
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsync    if (fOrgStateAndGen & RTSEMEVENTMULTILNX_STATE_MASK)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        rc = VINF_SUCCESS;
    else
    {
        /*
         * We have to wait.
         */
        RTR0SEMLNXWAIT Wait;
        rc = rtR0SemLnxWaitInit(&Wait, fFlags, uTimeout, &pThis->Head);
        if (RT_SUCCESS(rc))
        {
            IPRT_DEBUG_SEMS_STATE(pThis, 'E');
            for (;;)
            {
                /* The destruction test. */
                if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENTMULTI_MAGIC))
                    rc = VERR_SEM_DESTROYED;
                else
                {
                    rtR0SemLnxWaitPrepare(&Wait);

                    /* Check the exit conditions. */
                    if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENTMULTI_MAGIC))
                        rc = VERR_SEM_DESTROYED;
                    else if (ASMAtomicUoReadU32(&pThis->fStateAndGen) != fOrgStateAndGen)
                        rc = VINF_SUCCESS;
                    else if (rtR0SemLnxWaitHasTimedOut(&Wait))
                        rc = VERR_TIMEOUT;
                    else if (rtR0SemLnxWaitWasInterrupted(&Wait))
                        rc = VERR_INTERRUPTED;
                    else
                    {
                        /* Do the wait and then recheck the conditions. */
                        rtR0SemLnxWaitDoIt(&Wait);
                        continue;
                    }
                }
                break;
            }

            rtR0SemLnxWaitDelete(&Wait);
            IPRT_DEBUG_SEMS_STATE_RC(pThis, 'E', rc);
        }
    }

    rtR0SemEventMultiLnxRelease(pThis);
    return rc;
}


#undef RTSemEventMultiWaitEx
RTDECL(int)  RTSemEventMultiWaitEx(RTSEMEVENTMULTI hEventMultiSem, uint32_t fFlags, uint64_t uTimeout)
{
#ifndef RTSEMEVENT_STRICT
    return rtR0SemEventMultiLnxWait(hEventMultiSem, fFlags, uTimeout, NULL);
#else
    RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
    return rtR0SemEventMultiLnxWait(hEventMultiSem, fFlags, uTimeout, &SrcPos);
#endif
}
RT_EXPORT_SYMBOL(RTSemEventMultiWaitEx);


RTDECL(int)  RTSemEventMultiWaitExDebug(RTSEMEVENTMULTI hEventMultiSem, uint32_t fFlags, uint64_t uTimeout,
                                        RTHCUINTPTR uId, RT_SRC_POS_DECL)
{
    RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
    return rtR0SemEventMultiLnxWait(hEventMultiSem, fFlags, uTimeout, &SrcPos);
}
RT_EXPORT_SYMBOL(RTSemEventMultiWaitExDebug);