r0drv/linux/semeventmulti-r0drv-linux.c

	semeventmulti-r0drv-linux.c revision 5b281ba489ca18f0380d7efc7a5108b606cce449
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/* $Id$ */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/** @file
5b281ba489ca18f0380d7efc7a5108b606cce449vboxsync * IPRT - Multiple Release Event Semaphores, Ring-0 Driver, Linux.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/*
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * Copyright (C) 2006-2007 Sun Microsystems, Inc.
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 * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * Clara, CA 95054 USA or visit http://www.sun.com if you need
1c94c0a63ba68be1a7b2c640e70d7a06464e4fcavboxsync * additional information or have any questions.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/*******************************************************************************
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync*   Header Files                                                               *
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync*******************************************************************************/
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include "the-linux-kernel.h"
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include <iprt/semaphore.h>
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include <iprt/alloc.h>
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include <iprt/assert.h>
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include <iprt/asm.h>
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include <iprt/err.h>
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync#include "internal/magics.h"
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
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;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /** The object status - !0 when signaled and 0 when reset. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    uint32_t volatile   fState;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /** The wait queue. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    wait_queue_head_t   Head;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync} RTSEMEVENTMULTIINTERNAL, *PRTSEMEVENTMULTIINTERNAL;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int) RTSemEventMultiCreate(PRTSEMEVENTMULTI pEventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)RTMemAlloc(sizeof(*pThis));
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    if (pThis)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    {
9197680d465154232353e065bfc7e7b0fe026b97vboxsync        pThis->u32Magic = RTSEMEVENTMULTI_MAGIC;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        init_waitqueue_head(&pThis->Head);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        *pEventMultiSem = pThis;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        return VINF_SUCCESS;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    }
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    return VERR_NO_MEMORY;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int) RTSemEventMultiDestroy(RTSEMEVENTMULTI EventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Validate input.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
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);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Invalidate it and signal the object just in case.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    ASMAtomicIncU32(&pThis->u32Magic);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    ASMAtomicXchgU32(&pThis->fState, 0);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    Assert(!waitqueue_active(&pThis->Head));
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    wake_up_all(&pThis->Head);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    RTMemFree(pThis);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    return VINF_SUCCESS;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int) RTSemEventMultiSignal(RTSEMEVENTMULTI EventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Validate input.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
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);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Signal the event object.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    ASMAtomicXchgU32(&pThis->fState, 1);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    wake_up_all(&pThis->Head);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    return VINF_SUCCESS;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int) RTSemEventMultiReset(RTSEMEVENTMULTI EventMultiSem)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Validate input.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
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);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Reset it.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    ASMAtomicXchgU32(&pThis->fState, 0);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    return VINF_SUCCESS;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync/**
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * Worker for RTSemEventMulti and RTSemEventMultiNoResume.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync *
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @returns VBox status code.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @param   pThis           The event semaphore.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @param   cMillies            The number of milliseconds to wait.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync * @param   fInterruptible      Whether it's an interruptible wait or not.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync */
98ead928220b4ddc6626c581287987ae2416ba35vboxsyncstatic int rtSemEventMultiWait(PRTSEMEVENTMULTIINTERNAL pThis, unsigned cMillies, bool fInterruptible)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    /*
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     * Ok wait for it.
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync     */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    DEFINE_WAIT(Wait);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    int     rc       = VINF_SUCCESS;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    long    lTimeout = cMillies == RT_INDEFINITE_WAIT ? MAX_SCHEDULE_TIMEOUT : msecs_to_jiffies(cMillies);
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync#ifdef IPRT_DEBUG_SEMS
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync    snprintf(current->comm, TASK_COMM_LEN, "E%lx", IPRT_DEBUG_SEMS_ADDRESS(pThis));
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync#endif
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    for (;;)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    {
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        /* make everything thru schedule() atomic scheduling wise. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        prepare_to_wait(&pThis->Head, &Wait, fInterruptible ? TASK_INTERRUPTIBLE : TASK_UNINTERRUPTIBLE);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        /* check the condition. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        if (pThis->fState)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync            break;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        /* check for pending signals. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        if (fInterruptible && signal_pending(current))
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        {
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync            rc = VERR_INTERRUPTED;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync            break;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        }
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        /* wait */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        lTimeout = schedule_timeout(lTimeout);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        /* Check if someone destroyed the semaphore while we were waiting. */
9197680d465154232353e065bfc7e7b0fe026b97vboxsync        if (pThis->u32Magic != RTSEMEVENTMULTI_MAGIC)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        {
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync            rc = VERR_SEM_DESTROYED;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync            break;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        }
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        /* check for timeout. */
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        if (!lTimeout)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        {
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync            rc = VERR_TIMEOUT;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync            break;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        }
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    }
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    finish_wait(&pThis->Head, &Wait);
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync#ifdef IPRT_DEBUG_SEMS
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync    snprintf(current->comm, TASK_COMM_LEN, "E%lx:%d", IPRT_DEBUG_SEMS_ADDRESS(pThis), rc);
fe4be2b043180249b7f7d5b22aced0bfe75764c4vboxsync#endif
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    return rc;
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int) RTSemEventMultiWait(RTSEMEVENTMULTI EventMultiSem, unsigned cMillies)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
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);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    if (pThis->fState)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        return VINF_SUCCESS;
98ead928220b4ddc6626c581287987ae2416ba35vboxsync    return rtSemEventMultiWait(pThis, cMillies, false /* fInterruptible */);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsyncRTDECL(int) RTSemEventMultiWaitNoResume(RTSEMEVENTMULTI EventMultiSem, unsigned cMillies)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync{
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    PRTSEMEVENTMULTIINTERNAL pThis = (PRTSEMEVENTMULTIINTERNAL)EventMultiSem;
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);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync    if (pThis->fState)
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync        return VINF_SUCCESS;
98ead928220b4ddc6626c581287987ae2416ba35vboxsync    return rtSemEventMultiWait(pThis, cMillies, true /* fInterruptible */);
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync}
d25cdc250684c6ef5a0884806d778f96126501b3vboxsync