r0drv/linux/semeventmulti-r0drv-linux.c

d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/* $Id$ */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/** @file
5b281ba489ca18f0380d7efc7a5108b606cce449vboxsync * IPRT - Multiple Release Event Semaphores, Ring-0 Driver, Linux.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/*
c58f1213e628a545081c70e26c6b67a841cff880vboxsync * Copyright (C) 2006-2011 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.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/*******************************************************************************
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync*   Header Files                                                               *
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync*******************************************************************************/
715e49c31b15c23c17a9ce3be42a75e7c48d4b78vboxsync#define RTSEMEVENTMULTI_WITHOUT_REMAPPING
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include "the-linux-kernel.h"
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsync#include "internal/iprt.h"
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include <iprt/semaphore.h>
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include <iprt/assert.h>
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include <iprt/asm.h>
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include <iprt/err.h>
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync#include <iprt/mem.h>
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync#include <iprt/lockvalidator.h>
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync#include "waitqueue-r0drv-linux.h"
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include "internal/magics.h"
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync/*******************************************************************************
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync*   Defined Constants And Macros                                               *
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync*******************************************************************************/
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync/** @name fStateAndGen values
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync * @{ */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync/** The state bit number. */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync#define RTSEMEVENTMULTILNX_STATE_BIT        0
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync/** The state mask. */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync#define RTSEMEVENTMULTILNX_STATE_MASK       RT_BIT_32(RTSEMEVENTMULTILNX_STATE_BIT)
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync/** The generation mask. */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync#define RTSEMEVENTMULTILNX_GEN_MASK         ~RTSEMEVENTMULTILNX_STATE_MASK
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync/** The generation shift. */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync#define RTSEMEVENTMULTILNX_GEN_SHIFT        1
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync/** The initial variable value. */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync#define RTSEMEVENTMULTILNX_STATE_GEN_INIT   UINT32_C(0xfffffffc)
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync/** @}  */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
81a2bceb78e8b2f05efef55789b1689b31b3acacvboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/*******************************************************************************
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync*   Structures and Typedefs                                                    *
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync*******************************************************************************/
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/**
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * Linux event semaphore.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsynctypedef struct RTSEMEVENTMULTIINTERNAL
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
9197680d465154232353e065bfc7e7b0fe026b97vboxsync    /** Magic value (RTSEMEVENTMULTI_MAGIC). */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    uint32_t volatile   u32Magic;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    /** The object state bit and generation counter.
81a2bceb78e8b2f05efef55789b1689b31b3acacvboxsync     * The generation counter is incremented every time the object is
81a2bceb78e8b2f05efef55789b1689b31b3acacvboxsync     * signalled. */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    uint32_t volatile   fStateAndGen;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    /** Reference counter. */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    uint32_t volatile   cRefs;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /** The wait queue. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    wait_queue_head_t   Head;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync} RTSEMEVENTMULTIINTERNAL, *PRTSEMEVENTMULTIINTERNAL;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
ab93606043a9881487aa83be04191d2f4ea24071vboxsyncRTDECL(int)  RTSemEventMultiCreate(PRTSEMEVENTMULTI phEventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    return RTSemEventMultiCreateEx(phEventMultiSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
ab93606043a9881487aa83be04191d2f4ea24071vboxsync}
ab93606043a9881487aa83be04191d2f4ea24071vboxsync
ab93606043a9881487aa83be04191d2f4ea24071vboxsync
ab93606043a9881487aa83be04191d2f4ea24071vboxsyncRTDECL(int)  RTSemEventMultiCreateEx(PRTSEMEVENTMULTI phEventMultiSem, uint32_t fFlags, RTLOCKVALCLASS hClass,
ab93606043a9881487aa83be04191d2f4ea24071vboxsync                                     const char *pszNameFmt, ...)
ab93606043a9881487aa83be04191d2f4ea24071vboxsync{
29c2b5255de6d54cace83d114cc1ada61afd1047vboxsync    PRTSEMEVENTMULTIINTERNAL pThis;
ab93606043a9881487aa83be04191d2f4ea24071vboxsync
29c2b5255de6d54cace83d114cc1ada61afd1047vboxsync    AssertReturn(!(fFlags & ~RTSEMEVENTMULTI_FLAGS_NO_LOCK_VAL), VERR_INVALID_PARAMETER);
29c2b5255de6d54cace83d114cc1ada61afd1047vboxsync    pThis = (PRTSEMEVENTMULTIINTERNAL)RTMemAlloc(sizeof(*pThis));
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    if (pThis)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    {
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync        pThis->u32Magic     = RTSEMEVENTMULTI_MAGIC;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync        pThis->fStateAndGen = RTSEMEVENTMULTILNX_STATE_GEN_INIT;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync        pThis->cRefs        = 1;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        init_waitqueue_head(&pThis->Head);
ab93606043a9881487aa83be04191d2f4ea24071vboxsync
ab93606043a9881487aa83be04191d2f4ea24071vboxsync        *phEventMultiSem = pThis;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        return VINF_SUCCESS;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    }
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    return VERR_NO_MEMORY;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsyncRT_EXPORT_SYMBOL(RTSemEventMultiCreate);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync/**
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync * Retain a reference to the semaphore.
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync *
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync * @param   pThis       The semaphore.
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsyncDECLINLINE(void) rtR0SemEventMultiLnxRetain(PRTSEMEVENTMULTIINTERNAL pThis)
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync{
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    uint32_t cRefs = ASMAtomicIncU32(&pThis->cRefs);
b7735e45dcdf787218f5607c72dccf10ec357471vboxsync    NOREF(cRefs);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    Assert(cRefs && cRefs < 100000);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync}
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync/**
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync * Release a reference, destroy the thing if necessary.
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync *
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync * @param   pThis       The semaphore.
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsyncDECLINLINE(void) rtR0SemEventMultiLnxRelease(PRTSEMEVENTMULTIINTERNAL pThis)
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync{
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    if (RT_UNLIKELY(ASMAtomicDecU32(&pThis->cRefs) == 0))
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    {
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync        Assert(pThis->u32Magic != RTSEMEVENTMULTI_MAGIC);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync        RTMemFree(pThis);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    }
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync}
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
ab93606043a9881487aa83be04191d2f4ea24071vboxsyncRTDECL(int) RTSemEventMultiDestroy(RTSEMEVENTMULTI hEventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Validate input.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)hEventMultiSem;
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    if (pThis == NIL_RTSEMEVENTMULTI)
ab93606043a9881487aa83be04191d2f4ea24071vboxsync        return VINF_SUCCESS;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
9197680d465154232353e065bfc7e7b0fe026b97vboxsync    AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    Assert(pThis->cRefs > 0);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Invalidate it and signal the object just in case.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    ASMAtomicWriteU32(&pThis->u32Magic, ~RTSEMEVENTMULTI_MAGIC);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    ASMAtomicAndU32(&pThis->fStateAndGen, RTSEMEVENTMULTILNX_GEN_MASK);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    Assert(!waitqueue_active(&pThis->Head));
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    wake_up_all(&pThis->Head);
c50bfc216d56b8d3d2d9325ac60e63ce6df32ed8vboxsync    rtR0SemEventMultiLnxRelease(pThis);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    return VINF_SUCCESS;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsyncRT_EXPORT_SYMBOL(RTSemEventMultiDestroy);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
ab93606043a9881487aa83be04191d2f4ea24071vboxsyncRTDECL(int) RTSemEventMultiSignal(RTSEMEVENTMULTI hEventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    uint32_t fNew;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    uint32_t fOld;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Validate input.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)hEventMultiSem;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    if (!pThis)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        return VERR_INVALID_PARAMETER;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
9197680d465154232353e065bfc7e7b0fe026b97vboxsync    AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    rtR0SemEventMultiLnxRetain(pThis);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
ad27e1d5e48ca41245120c331cc88b50464813cevboxsync     * Signal the event object.  The cause of the paranoia here is racing to try
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync     * deal with racing RTSemEventMultiSignal calls (should probably be
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync     * forbidden, but it's relatively easy to handle).
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    do
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    {
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync        fNew = fOld = ASMAtomicUoReadU32(&pThis->fStateAndGen);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync        fNew += 1 << RTSEMEVENTMULTILNX_GEN_SHIFT;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync        fNew |= RTSEMEVENTMULTILNX_STATE_MASK;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    }
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    while (!ASMAtomicCmpXchgU32(&pThis->fStateAndGen, fNew, fOld));
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    wake_up_all(&pThis->Head);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    rtR0SemEventMultiLnxRelease(pThis);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    return VINF_SUCCESS;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsyncRT_EXPORT_SYMBOL(RTSemEventMultiSignal);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
ab93606043a9881487aa83be04191d2f4ea24071vboxsyncRTDECL(int) RTSemEventMultiReset(RTSEMEVENTMULTI hEventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Validate input.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
ab93606043a9881487aa83be04191d2f4ea24071vboxsync    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)hEventMultiSem;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    if (!pThis)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        return VERR_INVALID_PARAMETER;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
9197680d465154232353e065bfc7e7b0fe026b97vboxsync    AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    rtR0SemEventMultiLnxRetain(pThis);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Reset it.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    ASMAtomicAndU32(&pThis->fStateAndGen, ~RTSEMEVENTMULTILNX_STATE_MASK);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    rtR0SemEventMultiLnxRelease(pThis);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    return VINF_SUCCESS;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
aa4bcf0a4b2db3ac352b56a291d49cb8d4b66d32vboxsyncRT_EXPORT_SYMBOL(RTSemEventMultiReset);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/**
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync * Worker for RTSemEventMultiWaitEx and RTSemEventMultiWaitExDebug.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync *
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @returns VBox status code.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @param   pThis           The event semaphore.
683eff3070b1b86fe71b71af7fda82766ea19d17vboxsync * @param   fFlags          See RTSemEventMultiWaitEx.
683eff3070b1b86fe71b71af7fda82766ea19d17vboxsync * @param   uTimeout        See RTSemEventMultiWaitEx.
683eff3070b1b86fe71b71af7fda82766ea19d17vboxsync * @param   pSrcPos         The source code position of the wait.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsyncstatic int rtR0SemEventMultiLnxWait(PRTSEMEVENTMULTIINTERNAL pThis, uint32_t fFlags, uint64_t uTimeout,
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                                    PCRTLOCKVALSRCPOS pSrcPos)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    uint32_t    fOrgStateAndGen;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    int         rc;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync     * Validate the input.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    AssertPtrReturn(pThis, VERR_INVALID_PARAMETER);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    AssertMsgReturn(pThis->u32Magic == RTSEMEVENTMULTI_MAGIC, ("%p u32Magic=%RX32\n", pThis, pThis->u32Magic), VERR_INVALID_PARAMETER);
81a2bceb78e8b2f05efef55789b1689b31b3acacvboxsync    AssertReturn(RTSEMWAIT_FLAGS_ARE_VALID(fFlags), VERR_INVALID_PARAMETER);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    rtR0SemEventMultiLnxRetain(pThis);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    /*
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync     * Is the event already signalled or do we have to wait?
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync     */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    fOrgStateAndGen = ASMAtomicUoReadU32(&pThis->fStateAndGen);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    if (fOrgStateAndGen & RTSEMEVENTMULTILNX_STATE_MASK)
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync        rc = VINF_SUCCESS;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    else
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    {
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync        /*
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync         * We have to wait.
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync         */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync        RTR0SEMLNXWAIT Wait;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync        rc = rtR0SemLnxWaitInit(&Wait, fFlags, uTimeout, &pThis->Head);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync        if (RT_SUCCESS(rc))
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        {
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync            IPRT_DEBUG_SEMS_STATE(pThis, 'E');
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync            for (;;)
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync            {
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                /* The destruction test. */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENTMULTI_MAGIC))
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                    rc = VERR_SEM_DESTROYED;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                else
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                {
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                    rtR0SemLnxWaitPrepare(&Wait);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                    /* Check the exit conditions. */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                    if (RT_UNLIKELY(pThis->u32Magic != RTSEMEVENTMULTI_MAGIC))
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                        rc = VERR_SEM_DESTROYED;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                    else if (ASMAtomicUoReadU32(&pThis->fStateAndGen) != fOrgStateAndGen)
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                        rc = VINF_SUCCESS;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                    else if (rtR0SemLnxWaitHasTimedOut(&Wait))
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                        rc = VERR_TIMEOUT;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                    else if (rtR0SemLnxWaitWasInterrupted(&Wait))
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                        rc = VERR_INTERRUPTED;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                    else
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                    {
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                        /* Do the wait and then recheck the conditions. */
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                        rtR0SemLnxWaitDoIt(&Wait);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                        continue;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                    }
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                }
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                break;
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync            }
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync            rtR0SemLnxWaitDelete(&Wait);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync            IPRT_DEBUG_SEMS_STATE_RC(pThis, 'E', rc);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        }
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    }
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    rtR0SemEventMultiLnxRelease(pThis);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    return rc;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsyncRTDECL(int)  RTSemEventMultiWaitEx(RTSEMEVENTMULTI hEventMultiSem, uint32_t fFlags, uint64_t uTimeout)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync#ifndef RTSEMEVENT_STRICT
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    return rtR0SemEventMultiLnxWait(hEventMultiSem, fFlags, uTimeout, NULL);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync#else
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_NORMAL_API();
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    return rtR0SemEventMultiLnxWait(hEventMultiSem, fFlags, uTimeout, &SrcPos);
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync#endif
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsyncRT_EXPORT_SYMBOL(RTSemEventMultiWaitEx);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsyncRTDECL(int)  RTSemEventMultiWaitExDebug(RTSEMEVENTMULTI hEventMultiSem, uint32_t fFlags, uint64_t uTimeout,
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync                                        RTHCUINTPTR uId, RT_SRC_POS_DECL)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    RTLOCKVALSRCPOS SrcPos = RTLOCKVALSRCPOS_INIT_DEBUG_API();
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsync    return rtR0SemEventMultiLnxWait(hEventMultiSem, fFlags, uTimeout, &SrcPos);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
d1c36fd86d36726777e3d6f9d040573e0aaf30devboxsyncRT_EXPORT_SYMBOL(RTSemEventMultiWaitExDebug);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
e0e7da0420be1398d23ffa9953686d3a43619abdvboxsync
e0e7da0420be1398d23ffa9953686d3a43619abdvboxsyncRTDECL(uint32_t) RTSemEventMultiGetResolution(void)
e0e7da0420be1398d23ffa9953686d3a43619abdvboxsync{
e0e7da0420be1398d23ffa9953686d3a43619abdvboxsync    return rtR0SemLnxWaitGetResolution();
e0e7da0420be1398d23ffa9953686d3a43619abdvboxsync}
e0e7da0420be1398d23ffa9953686d3a43619abdvboxsyncRT_EXPORT_SYMBOL(RTSemEventMultiGetResolution);
e0e7da0420be1398d23ffa9953686d3a43619abdvboxsync