fileaio-posix.cpp revision 3633fa76957c4740b8d4372e0dfc938d3c3ea569
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync/* $Id$ */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync/** @file
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * IPRT - File async I/O, native implementation for POSIX compliant host platforms.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync/*
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Copyright (C) 2006-2007 Sun Microsystems, Inc.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync *
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * This file is part of VirtualBox Open Source Edition (OSE), as
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * available from http://www.virtualbox.org. This file is free software;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * you can redistribute it and/or modify it under the terms of the GNU
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * General Public License (GPL) as published by the Free Software
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Foundation, in version 2 as it comes in the "COPYING" file of the
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync *
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * The contents of this file may alternatively be used under the terms
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * of the Common Development and Distribution License Version 1.0
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * VirtualBox OSE distribution, in which case the provisions of the
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * CDDL are applicable instead of those of the GPL.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync *
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * You may elect to license modified versions of this file under the
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * terms and conditions of either the GPL or the CDDL or both.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync *
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Clara, CA 95054 USA or visit http://www.sun.com if you need
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * additional information or have any questions.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync/*******************************************************************************
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync* Header Files *
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync*******************************************************************************/
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync#define LOG_GROUP RTLOGGROUP_DIR
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync#include <iprt/asm.h>
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync#include <iprt/file.h>
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync#include <iprt/mem.h>
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync#include <iprt/assert.h>
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync#include <iprt/string.h>
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync#include <iprt/err.h>
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync#include <iprt/log.h>
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync#include <iprt/thread.h>
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync#include <iprt/semaphore.h>
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync#include "internal/fileaio.h"
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync#include <aio.h>
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync#include <errno.h>
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync#include <time.h>
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync/*
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync * Linux does not define this value.
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync * Just define it with really big
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync * value.
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync */
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync#ifndef AIO_LISTIO_MAX
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync# define AIO_LISTIO_MAX UINT32_MAX
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync#endif
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync/*******************************************************************************
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync* Structures and Typedefs *
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync*******************************************************************************/
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync/**
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Async I/O request state.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsynctypedef struct RTFILEAIOREQINTERNAL
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** The aio control block. FIRST ELEMENT! */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync struct aiocb AioCB;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Next element in the chain. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync struct RTFILEAIOREQINTERNAL *pNext;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Flag whether this is a flush request. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync bool fFlush;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Flag indicating if the request was canceled. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync volatile bool fCanceled;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Opaque user data. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync void *pvUser;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Number of bytes actually transfered. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync size_t cbTransfered;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Status code. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync int Rc;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Completion context we are assigned to. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync struct RTFILEAIOCTXINTERNAL *pCtxInt;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Entry in the waiting list the request is in. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync unsigned iWaitingList;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Magic value (RTFILEAIOREQ_MAGIC). */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync uint32_t u32Magic;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync} RTFILEAIOREQINTERNAL, *PRTFILEAIOREQINTERNAL;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync/**
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Async I/O completion context state.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsynctypedef struct RTFILEAIOCTXINTERNAL
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Current number of requests active on this context. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync volatile int32_t cRequests;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Maximum number of requests this context can handle. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync uint32_t cMaxRequests;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** The ID of the thread which is currently waiting for requests. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync volatile RTTHREAD hThreadWait;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Flag whether the thread was woken up. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync volatile bool fWokenUp;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Flag whether the thread is currently waiting in the syscall. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync volatile bool fWaiting;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Magic value (RTFILEAIOCTX_MAGIC). */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync uint32_t u32Magic;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Flag whether the thread was woken up due to a internal event. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync volatile bool fWokenUpInternal;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** List of new requests which needs to be inserted into apReqs by the
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * waiting thread. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync volatile PRTFILEAIOREQINTERNAL apReqsNewHead[5];
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Special entry for requests which are canceled. Because only one
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * request can be canceled at a time and the thread canceling the request
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * has to wait we need only one entry. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync volatile PRTFILEAIOREQINTERNAL pReqToCancel;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Event semaphore the canceling thread is waiting for completion of
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * the operation. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTSEMEVENT SemEventCancel;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** Number of elements in the waiting list. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync unsigned cReqsWait;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** First free slot in the waiting list. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync unsigned iFirstFree;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** List of requests we are currently waiting on.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Size depends on cMaxRequests. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync volatile PRTFILEAIOREQINTERNAL apReqs[1];
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync} RTFILEAIOCTXINTERNAL, *PRTFILEAIOCTXINTERNAL;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync/**
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Internal worker for waking up the waiting thread.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncstatic void rtFileAioCtxWakeup(PRTFILEAIOCTXINTERNAL pCtxInt)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /*
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Read the thread handle before the status flag.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * If we read the handle after the flag we might
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * end up with an invalid handle because the thread
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * waiting in RTFileAioCtxWakeup() might get scheduled
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * before we read the flag and returns.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * We can ensure that the handle is valid if fWaiting is true
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * when reading the handle before the status flag.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTTHREAD hThread;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync ASMAtomicReadHandle(&pCtxInt->hThreadWait, &hThread);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync bool fWaiting = ASMAtomicReadBool(&pCtxInt->fWaiting);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (fWaiting)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /*
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * If a thread waits the handle must be valid.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * It is possible that the thread returns from
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * aio_suspend() before the signal is send.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * This is no problem because we already set fWokenUp
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * to true which will let the thread return VERR_INTERRUPTED
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * and the next call to RTFileAioCtxWait() will not
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * return VERR_INTERRUPTED because signals are not saved
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * and will simply vanish if the destination thread can't
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * receive it.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync Assert(hThread != NIL_RTTHREAD);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTThreadPoke(hThread);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync/**
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Internal worker processing events and inserting new requests into the waiting list.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncstatic int rtFileAioCtxProcessEvents(PRTFILEAIOCTXINTERNAL pCtxInt)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync int rc = VINF_SUCCESS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Process new requests first. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync bool fWokenUp = ASMAtomicXchgBool(&pCtxInt->fWokenUpInternal, false);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (fWokenUp)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync for (unsigned iSlot = 0; iSlot < RT_ELEMENTS(pCtxInt->apReqsNewHead); iSlot++)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOREQINTERNAL pReqHead = (PRTFILEAIOREQINTERNAL)ASMAtomicXchgPtr((void* volatile*)&pCtxInt->apReqsNewHead[iSlot],
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync NULL);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync while (pReqHead)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pCtxInt->apReqs[pCtxInt->iFirstFree] = pReqHead;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqHead->iWaitingList = pCtxInt->iFirstFree;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqHead = pReqHead->pNext;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Clear pointer to next element just for safety. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pCtxInt->apReqs[pCtxInt->iFirstFree]->pNext = NULL;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pCtxInt->iFirstFree++;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync Assert(pCtxInt->iFirstFree <= pCtxInt->cMaxRequests);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Check if a request needs to be canceled. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOREQINTERNAL pReqToCancel = (PRTFILEAIOREQINTERNAL)ASMAtomicReadPtr((void* volatile*)&pCtxInt->pReqToCancel);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (pReqToCancel)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Put it out of the waiting list. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pCtxInt->apReqs[pReqToCancel->iWaitingList] = pCtxInt->apReqs[--pCtxInt->iFirstFree];
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pCtxInt->apReqs[pReqToCancel->iWaitingList]->iWaitingList = pReqToCancel->iWaitingList;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync ASMAtomicDecS32(&pCtxInt->cRequests);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTSemEventSignal(pCtxInt->SemEventCancel);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync else
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (ASMAtomicXchgBool(&pCtxInt->fWokenUp, false))
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync rc = VERR_INTERRUPTED;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return rc;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncRTR3DECL(int) RTFileAioReqCreate(PRTFILEAIOREQ phReq)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync AssertPtrReturn(phReq, VERR_INVALID_POINTER);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOREQINTERNAL pReqInt = (PRTFILEAIOREQINTERNAL)RTMemAllocZ(sizeof(RTFILEAIOREQINTERNAL));
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (RT_UNLIKELY(!pReqInt))
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VERR_NO_MEMORY;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqInt->pCtxInt = NULL;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqInt->u32Magic = RTFILEAIOREQ_MAGIC;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync *phReq = (RTFILEAIOREQ)pReqInt;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VINF_SUCCESS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncRTDECL(void) RTFileAioReqDestroy(RTFILEAIOREQ hReq)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /*
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Validate the handle and ignore nil.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (hReq == NIL_RTFILEAIOREQ)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOREQINTERNAL pReqInt = hReq;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTFILEAIOREQ_VALID_RETURN_VOID(pReqInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /*
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Trash the magic and free it.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync ASMAtomicUoWriteU32(&pReqInt->u32Magic, ~RTFILEAIOREQ_MAGIC);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTMemFree(pReqInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync/**
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Worker setting up the request.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncDECLINLINE(int) rtFileAioReqPrepareTransfer(RTFILEAIOREQ hReq, RTFILE hFile,
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync unsigned uTransferDirection,
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTFOFF off, void *pvBuf, size_t cbTransfer,
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync void *pvUser)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /*
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Validate the input.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOREQINTERNAL pReqInt = hReq;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTFILEAIOREQ_VALID_RETURN(pReqInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync Assert(hFile != NIL_RTFILE);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync AssertPtr(pvBuf);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync Assert(off >= 0);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync Assert(cbTransfer > 0);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync memset(&pReqInt->AioCB, 0, sizeof(struct aiocb));
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqInt->AioCB.aio_lio_opcode = uTransferDirection;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqInt->AioCB.aio_fildes = (int)hFile;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqInt->AioCB.aio_offset = off;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqInt->AioCB.aio_nbytes = cbTransfer;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqInt->AioCB.aio_buf = pvBuf;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqInt->pvUser = pvUser;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqInt->pCtxInt = NULL;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqInt->Rc = VERR_FILE_AIO_IN_PROGRESS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VINF_SUCCESS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncRTDECL(int) RTFileAioReqPrepareRead(RTFILEAIOREQ hReq, RTFILE hFile, RTFOFF off,
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync void *pvBuf, size_t cbRead, void *pvUser)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return rtFileAioReqPrepareTransfer(hReq, hFile, LIO_READ,
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync off, pvBuf, cbRead, pvUser);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncRTDECL(int) RTFileAioReqPrepareWrite(RTFILEAIOREQ hReq, RTFILE hFile, RTFOFF off,
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync void *pvBuf, size_t cbWrite, void *pvUser)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return rtFileAioReqPrepareTransfer(hReq, hFile, LIO_WRITE,
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync off, pvBuf, cbWrite, pvUser);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncRTDECL(int) RTFileAioReqPrepareFlush(RTFILEAIOREQ hReq, RTFILE hFile, void *pvUser)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOREQINTERNAL pReqInt = (PRTFILEAIOREQINTERNAL)hReq;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTFILEAIOREQ_VALID_RETURN(pReqInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync Assert(hFile != NIL_RTFILE);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqInt->fFlush = true;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqInt->AioCB.aio_fildes = (int)hFile;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReqInt->pvUser = pvUser;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VINF_SUCCESS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncRTDECL(void *) RTFileAioReqGetUser(RTFILEAIOREQ hReq)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOREQINTERNAL pReqInt = hReq;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTFILEAIOREQ_VALID_RETURN_RC(pReqInt, NULL);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return pReqInt->pvUser;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncRTDECL(int) RTFileAioReqCancel(RTFILEAIOREQ hReq)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOREQINTERNAL pReqInt = hReq;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTFILEAIOREQ_VALID_RETURN(pReqInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync ASMAtomicXchgBool(&pReqInt->fCanceled, true);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync int rcPosix = aio_cancel(pReqInt->AioCB.aio_fildes, &pReqInt->AioCB);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (rcPosix == AIO_CANCELED)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOCTXINTERNAL pCtxInt = pReqInt->pCtxInt;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /*
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Notify the waiting thread that the request was canceled.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync AssertMsg(VALID_PTR(pCtxInt),
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync ("Invalid state. Request was canceled but wasn't submitted\n"));
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync Assert(!pCtxInt->pReqToCancel);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync ASMAtomicWritePtr((void* volatile*)&pCtxInt->pReqToCancel, pReqInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync rtFileAioCtxWakeup(pCtxInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Wait for acknowledge. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync int rc = RTSemEventWait(pCtxInt->SemEventCancel, RT_INDEFINITE_WAIT);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync AssertRC(rc);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync ASMAtomicWritePtr((void* volatile*)&pCtxInt->pReqToCancel, NULL);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VINF_SUCCESS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync else if (rcPosix == AIO_ALLDONE)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VERR_FILE_AIO_COMPLETED;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync else if (rcPosix == AIO_NOTCANCELED)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VERR_FILE_AIO_IN_PROGRESS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync else
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return RTErrConvertFromErrno(errno);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncRTDECL(int) RTFileAioReqGetRC(RTFILEAIOREQ hReq, size_t *pcbTransfered)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOREQINTERNAL pReqInt = hReq;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTFILEAIOREQ_VALID_RETURN(pReqInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync AssertPtrNull(pcbTransfered);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if ( (pReqInt->Rc != VERR_FILE_AIO_IN_PROGRESS)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync && (pcbTransfered))
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync *pcbTransfered = pReqInt->cbTransfered;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return pReqInt->Rc;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncRTDECL(int) RTFileAioCtxCreate(PRTFILEAIOCTX phAioCtx, uint32_t cAioReqsMax)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOCTXINTERNAL pCtxInt;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync AssertPtrReturn(phAioCtx, VERR_INVALID_POINTER);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pCtxInt = (PRTFILEAIOCTXINTERNAL)RTMemAllocZ( sizeof(RTFILEAIOCTXINTERNAL)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync + cAioReqsMax * sizeof(PRTFILEAIOREQINTERNAL));
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (RT_UNLIKELY(!pCtxInt))
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VERR_NO_MEMORY;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Create event semaphore. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync int rc = RTSemEventCreate(&pCtxInt->SemEventCancel);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (RT_FAILURE(rc))
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTMemFree(pCtxInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return rc;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pCtxInt->u32Magic = RTFILEAIOCTX_MAGIC;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pCtxInt->cMaxRequests = cAioReqsMax;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync *phAioCtx = (RTFILEAIOCTX)pCtxInt;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VINF_SUCCESS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncRTDECL(int) RTFileAioCtxDestroy(RTFILEAIOCTX hAioCtx)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOCTXINTERNAL pCtxInt = hAioCtx;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync AssertPtrReturn(pCtxInt, VERR_INVALID_HANDLE);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (RT_UNLIKELY(pCtxInt->cRequests))
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VERR_FILE_AIO_BUSY;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTSemEventDestroy(pCtxInt->SemEventCancel);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTMemFree(pCtxInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VINF_SUCCESS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncRTDECL(uint32_t) RTFileAioCtxGetMaxReqCount(RTFILEAIOCTX hAioCtx)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOCTXINTERNAL pCtxInt = hAioCtx;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (hAioCtx == NIL_RTFILEAIOCTX)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return RTFILEAIO_UNLIMITED_REQS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync else
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return pCtxInt->cMaxRequests;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncRTDECL(int) RTFileAioCtxAssociateWithFile(RTFILEAIOCTX hAioCtx, RTFILE hFile)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VINF_SUCCESS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsyncRTDECL(int) RTFileAioCtxSubmit(RTFILEAIOCTX hAioCtx, PRTFILEAIOREQ pahReqs, size_t cReqs, size_t *pcReqs)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync int rc = VINF_SUCCESS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOCTXINTERNAL pCtxInt = hAioCtx;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Parameter checks */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync AssertPtrReturn(pCtxInt, VERR_INVALID_HANDLE);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync AssertReturn(cReqs != 0, VERR_INVALID_POINTER);
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync AssertPtrReturn(pahReqs, VERR_INVALID_PARAMETER);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Check that we don't exceed the limit */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (ASMAtomicUoReadS32(&pCtxInt->cRequests) + cReqs > pCtxInt->cMaxRequests)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VERR_FILE_AIO_LIMIT_EXCEEDED;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOREQINTERNAL pHead = NULL;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync do
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync int rcPosix = 0;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync size_t cReqsSubmit = 0;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync size_t i = 0;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync PRTFILEAIOREQINTERNAL pReqInt;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync while ( (i < cReqs)
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync && (i < AIO_LISTIO_MAX))
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync {
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync pReqInt = pahReqs[i];
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync RTFILEAIOREQ_VALID_RETURN(pReqInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync pReqInt->pCtxInt = pCtxInt;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync /* Link them together. */
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync pReqInt->pNext = pHead;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync pHead = pReqInt;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync if (pReqInt->fFlush)
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync break;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync cReqsSubmit++;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync i++;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync }
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync if (cReqsSubmit)
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync {
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync rcPosix = lio_listio(LIO_NOWAIT, (struct aiocb **)pahReqs, cReqsSubmit, NULL);
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync if (RT_UNLIKELY(rcPosix < 0))
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync {
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync rc = RTErrConvertFromErrno(errno);
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync break;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync }
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync ASMAtomicAddS32(&pCtxInt->cRequests, cReqsSubmit);
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync cReqs -= cReqsSubmit;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync pahReqs += cReqsSubmit;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync *pcReqs += cReqsSubmit;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync /* Check if we have a flush request now. */
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync if (cReqs)
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync {
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync pReqInt = pahReqs[0];
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync RTFILEAIOREQ_VALID_RETURN(pReqInt);
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync if (pReqInt->fFlush)
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync {
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync /*
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync * lio_listio does not work with flush requests so
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync * we have to use aio_fsync directly.
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync */
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync rcPosix = aio_fsync(O_SYNC, &pReqInt->AioCB);
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync if (RT_UNLIKELY(rcPosix < 0))
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync {
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync rc = RTErrConvertFromErrno(errno);
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync break;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync }
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync ASMAtomicIncS32(&pCtxInt->cRequests);
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync cReqs--;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync pahReqs++;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync *pcReqs++;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync }
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync }
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync } while (cReqs);
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync if (pHead)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync /*
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync * Forward successfully submitted requests to the thread waiting for requests.
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync * We search for a free slot first and if we don't find one
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync * we will grab the first one and append our list to the existing entries.
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync */
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync unsigned iSlot = 0;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync while ( (iSlot < RT_ELEMENTS(pCtxInt->apReqsNewHead))
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync && !ASMAtomicCmpXchgPtr((void * volatile *)&pCtxInt->apReqsNewHead[iSlot], pHead, NULL))
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync iSlot++;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync if (iSlot == RT_ELEMENTS(pCtxInt->apReqsNewHead))
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync {
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync /* Nothing found. */
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync PRTFILEAIOREQINTERNAL pOldHead = (PRTFILEAIOREQINTERNAL)ASMAtomicXchgPtr((void * volatile *)&pCtxInt->apReqsNewHead[0],
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync NULL);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync /* Find the end of the current head and link the old list to the current. */
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync PRTFILEAIOREQINTERNAL pTail = pHead;
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync while (pTail->pNext)
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync pTail = pTail->pNext;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync pTail->pNext = pOldHead;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync ASMAtomicXchgPtr((void * volatile *)&pCtxInt->apReqsNewHead[0], pHead);
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync /* Set the internal wakeup flag and wakeup the thread if possible. */
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync bool fWokenUp = ASMAtomicXchgBool(&pCtxInt->fWokenUpInternal, true);
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync if (!fWokenUp)
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync rtFileAioCtxWakeup(pCtxInt);
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync }
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync
3633fa76957c4740b8d4372e0dfc938d3c3ea569vboxsync return rc;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncRTDECL(int) RTFileAioCtxWait(RTFILEAIOCTX hAioCtx, size_t cMinReqs, unsigned cMillisTimeout,
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOREQ pahReqs, size_t cReqs, uint32_t *pcReqs)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync int rc = VINF_SUCCESS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync int cRequestsCompleted = 0;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOCTXINTERNAL pCtxInt = (PRTFILEAIOCTXINTERNAL)hAioCtx;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync struct timespec Timeout;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync struct timespec *pTimeout = NULL;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync uint64_t StartNanoTS = 0;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Check parameters. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync AssertPtrReturn(pCtxInt, VERR_INVALID_HANDLE);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync AssertPtrReturn(pcReqs, VERR_INVALID_POINTER);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync AssertPtrReturn(pahReqs, VERR_INVALID_POINTER);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync AssertReturn(cReqs != 0, VERR_INVALID_PARAMETER);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync AssertReturn(cReqs >= cMinReqs, VERR_OUT_OF_RANGE);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (RT_UNLIKELY(ASMAtomicReadS32(&pCtxInt->cRequests) == 0))
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VERR_FILE_AIO_NO_REQUEST;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (cMillisTimeout != RT_INDEFINITE_WAIT)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync Timeout.tv_sec = cMillisTimeout / 1000;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync Timeout.tv_nsec = (cMillisTimeout % 1000) * 1000000;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pTimeout = &Timeout;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync StartNanoTS = RTTimeNanoTS();
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Wait for at least one. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (!cMinReqs)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync cMinReqs = 1;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* For the wakeup call. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync Assert(pCtxInt->hThreadWait == NIL_RTTHREAD);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync ASMAtomicWriteHandle(&pCtxInt->hThreadWait, RTThreadSelf());
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Update the waiting list once before we enter the loop. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync rc = rtFileAioCtxProcessEvents(pCtxInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync while ( cMinReqs
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync && RT_SUCCESS_NP(rc))
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync ASMAtomicXchgBool(&pCtxInt->fWaiting, true);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync int rcPosix = aio_suspend((const struct aiocb * const *)pCtxInt->apReqs,
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pCtxInt->iFirstFree, pTimeout);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync ASMAtomicXchgBool(&pCtxInt->fWaiting, false);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (rcPosix < 0)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Check that this is an external wakeup event. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (errno == EINTR)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync rc = rtFileAioCtxProcessEvents(pCtxInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync else
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync rc = RTErrConvertFromErrno(errno);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync else
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Requests finished. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync unsigned iReqCurr = 0;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync int cDone = 0;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Remove completed requests from the waiting list. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync while (iReqCurr < pCtxInt->iFirstFree)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOREQINTERNAL pReq = pCtxInt->apReqs[iReqCurr];
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync int rcReq = aio_error(&pReq->AioCB);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (rcReq != EINPROGRESS)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Completed store the return code. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (rcReq == 0)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReq->Rc = VINF_SUCCESS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Call aio_return() to free ressources. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReq->cbTransfered = aio_return(&pReq->AioCB);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync else
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pReq->Rc = RTErrConvertFromErrno(rcReq);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync cDone++;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /*
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * Move the last entry into the current position to avoid holes
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * but only if it is not the last element already.
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (pReq->iWaitingList < pCtxInt->iFirstFree - 1)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pCtxInt->apReqs[pReq->iWaitingList] = pCtxInt->apReqs[--pCtxInt->iFirstFree];
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pCtxInt->apReqs[pReq->iWaitingList]->iWaitingList = pReq->iWaitingList;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pCtxInt->apReqs[pCtxInt->iFirstFree] = NULL;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync else
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pCtxInt->iFirstFree--;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Put the request into the completed list. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync pahReqs[cRequestsCompleted++] = pReq;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync else
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync iReqCurr++;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync cReqs -= cDone;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync cMinReqs -= cDone;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync ASMAtomicSubS32(&pCtxInt->cRequests, cDone);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if ((cMillisTimeout != RT_INDEFINITE_WAIT) && (cMinReqs > 0))
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync {
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync uint64_t TimeDiff;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Recalculate the timeout. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync TimeDiff = RTTimeSystemNanoTS() - StartNanoTS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync Timeout.tv_sec = Timeout.tv_sec - (TimeDiff / 1000000);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync Timeout.tv_nsec = Timeout.tv_nsec - (TimeDiff % 1000000);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /* Check for new elements. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync rc = rtFileAioCtxProcessEvents(pCtxInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync }
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync *pcReqs = cRequestsCompleted;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync Assert(pCtxInt->hThreadWait == RTThreadSelf());
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync ASMAtomicWriteHandle(&pCtxInt->hThreadWait, NIL_RTTHREAD);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return rc;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsyncRTDECL(int) RTFileAioCtxWakeup(RTFILEAIOCTX hAioCtx)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync{
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync PRTFILEAIOCTXINTERNAL pCtxInt = hAioCtx;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync RTFILEAIOCTX_VALID_RETURN(pCtxInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync /** @todo r=bird: Define the protocol for how to resume work after calling
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync * this function. */
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync bool fWokenUp = ASMAtomicXchgBool(&pCtxInt->fWokenUp, true);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync if (!fWokenUp)
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync rtFileAioCtxWakeup(pCtxInt);
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync return VINF_SUCCESS;
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync}
cba55d7782acd89472e03b4376591ff57fe7b80evboxsync