semevent-win.cpp revision f2af1be3e27a2fefe95332260d360f4b26cffbcf
/* $Id$ */
/** @file
* IPRT - Event Sempahore, Windows.
*/
/*
* Copyright (C) 2006-2010 Sun Microsystems, Inc.
*
* This file is part of VirtualBox Open Source Edition (OSE), as
* available from http://www.virtualbox.org. This file is free software;
* you can redistribute it and/or modify it under the terms of the GNU
* General Public License (GPL) as published by the Free Software
* Foundation, in version 2 as it comes in the "COPYING" file of the
* VirtualBox OSE distribution. VirtualBox OSE is distributed in the
* hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL) only, as it comes in the "COPYING.CDDL" file of the
* VirtualBox OSE distribution, in which case the provisions of the
* CDDL are applicable instead of those of the GPL.
*
* You may elect to license modified versions of this file under the
* terms and conditions of either the GPL or the CDDL or both.
*
* Please contact Sun Microsystems, Inc., 4150 Network Circle, Santa
* Clara, CA 95054 USA or visit http://www.sun.com if you need
* additional information or have any questions.
*/
/*******************************************************************************
* Header Files *
*******************************************************************************/
#define LOG_GROUP RTLOGGROUP_SEMAPHORE
#include <Windows.h>
#include <iprt/semaphore.h>
#include "internal/iprt.h"
#include <iprt/asm.h>
#include <iprt/assert.h>
#include <iprt/err.h>
#include <iprt/lockvalidator.h>
#include <iprt/mem.h>
#include <iprt/thread.h>
#include "internal/magics.h"
#include "internal/strict.h"
/*******************************************************************************
* Defined Constants And Macros *
*******************************************************************************/
struct RTSEMEVENTINTERNAL
{
/** Magic value (RTSEMEVENT_MAGIC). */
uint32_t u32Magic;
/** The event handle. */
HANDLE hev;
#ifdef RTSEMEVENT_STRICT
/** Signallers. */
RTLOCKVALRECSHRD Signallers;
/** Indicates that lock validation should be performed. */
bool volatile fEverHadSignallers;
#endif
};
/* Undefine debug mappings. */
#undef RTSemEventWait
#undef RTSemEventWaitNoResume
RTDECL(int) RTSemEventCreate(PRTSEMEVENT pEventSem)
{
struct RTSEMEVENTINTERNAL *pThis = (struct RTSEMEVENTINTERNAL *)RTMemAlloc(sizeof(*pThis));
if (!pThis)
return VERR_NO_MEMORY;
/*
* Create the semaphore.
* (Auto reset, not signaled, private event object.)
*/
pThis->hev = CreateEvent(NULL, FALSE, FALSE, NULL);
if (pThis->hev != NULL) /* not INVALID_HANDLE_VALUE */
{
pThis->u32Magic = RTSEMEVENT_MAGIC;
#ifdef RTSEMEVENT_STRICT
RTLockValidatorRecSharedInit(&pThis->Signallers,
NIL_RTLOCKVALCLASS, RTLOCKVAL_SUB_CLASS_ANY,
"RTSemEvent", pThis, true /*fSignaller*/);
pThis->fEverHadSignallers = false;
#endif
*pEventSem = pThis;
return VINF_SUCCESS;
}
DWORD dwErr = GetLastError();
RTMemFree(pThis);
return RTErrConvertFromWin32(dwErr);
}
RTDECL(int) RTSemEventDestroy(RTSEMEVENT EventSem)
{
struct RTSEMEVENTINTERNAL *pThis = EventSem;
if (pThis == NIL_RTSEMEVENT) /* don't bitch */
return VERR_INVALID_HANDLE;
AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
AssertReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, VERR_INVALID_HANDLE);
/*
* Invalidate the handle and close the semaphore.
*/
int rc = VINF_SUCCESS;
AssertReturn(ASMAtomicCmpXchgU32(&pThis->u32Magic, ~RTSEMEVENT_MAGIC, RTSEMEVENT_MAGIC), VERR_INVALID_HANDLE);
if (CloseHandle(pThis->hev))
{
#ifdef RTSEMEVENT_STRICT
RTLockValidatorRecSharedDelete(&pThis->Signallers);
#endif
RTMemFree(pThis);
}
else
{
DWORD dwErr = GetLastError();
rc = RTErrConvertFromWin32(dwErr);
AssertMsgFailed(("Destroy EventSem %p failed, lasterr=%u (%Rrc)\n", pThis, dwErr, rc));
/* Leak it. */
}
return rc;
}
RTDECL(int) RTSemEventSignal(RTSEMEVENT EventSem)
{
/*
* Validate input.
*/
struct RTSEMEVENTINTERNAL *pThis = EventSem;
AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
AssertReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, VERR_INVALID_HANDLE);
#ifdef RTSEMEVENT_STRICT
if (pThis->fEverHadSignallers)
{
int rc9 = RTLockValidatorRecSharedCheckSignaller(&pThis->Signallers, NIL_RTTHREAD);
if (RT_FAILURE(rc9))
return rc9;
}
#endif
/*
* Signal the object.
*/
if (SetEvent(pThis->hev))
return VINF_SUCCESS;
DWORD dwErr = GetLastError();
AssertMsgFailed(("Signaling EventSem %p failed, lasterr=%d\n", pThis, dwErr));
return RTErrConvertFromWin32(dwErr);
}
/** Goto avoidance. */
DECL_FORCE_INLINE(int) rtSemEventWaitHandleStatus(struct RTSEMEVENTINTERNAL *pThis, DWORD rc)
{
switch (rc)
{
case WAIT_OBJECT_0: return VINF_SUCCESS;
case WAIT_TIMEOUT: return VERR_TIMEOUT;
case WAIT_IO_COMPLETION: return VERR_INTERRUPTED;
case WAIT_ABANDONED: return VERR_SEM_OWNER_DIED;
default:
AssertMsgFailed(("%u\n", rc));
case WAIT_FAILED:
{
int rc2 = RTErrConvertFromWin32(GetLastError());
AssertMsgFailed(("Wait on EventSem %p failed, rc=%d lasterr=%d\n", pThis, rc, GetLastError()));
if (rc2)
return rc2;
AssertMsgFailed(("WaitForSingleObject(event) -> rc=%d while converted lasterr=%d\n", rc, rc2));
return VERR_INTERNAL_ERROR;
}
}
}
RTDECL(int) RTSemEventWaitNoResume(RTSEMEVENT EventSem, unsigned cMillies)
{
PCRTLOCKVALSRCPOS pSrcPos = NULL;
/*
* Validate input.
*/
struct RTSEMEVENTINTERNAL *pThis = EventSem;
AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
AssertReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, VERR_INVALID_HANDLE);
/*
* Wait for condition.
*/
#ifdef RTSEMEVENT_STRICT
RTTHREAD hThreadSelf = RTThreadSelfAutoAdopt();
if (pThis->fEverHadSignallers)
{
DWORD rc = WaitForSingleObjectEx(pThis->hev,
0 /*Timeout*/,
TRUE /*fAlertable*/);
if (rc != WAIT_TIMEOUT || cMillies == 0)
return rtSemEventWaitHandleStatus(pThis, rc);
int rc9 = RTLockValidatorRecSharedCheckBlocking(&pThis->Signallers, hThreadSelf, pSrcPos, false,
RTTHREADSTATE_EVENT, true);
if (RT_FAILURE(rc9))
return rc9;
}
#else
RTTHREAD hThreadSelf = RTThreadSelf();
#endif
RTThreadBlocking(hThreadSelf, RTTHREADSTATE_EVENT, true);
DWORD rc = WaitForSingleObjectEx(pThis->hev,
cMillies == RT_INDEFINITE_WAIT ? INFINITE : cMillies,
TRUE /*fAlertable*/);
RTThreadUnblocked(hThreadSelf, RTTHREADSTATE_EVENT);
return rtSemEventWaitHandleStatus(pThis, rc);
}
RTDECL(void) RTSemEventSetSignaller(RTSEMEVENT hEventSem, RTTHREAD hThread)
{
#ifdef RTSEMEVENT_STRICT
struct RTSEMEVENTINTERNAL *pThis = hEventSem;
AssertPtrReturnVoid(pThis);
AssertReturnVoid(pThis->u32Magic == RTSEMEVENT_MAGIC);
ASMAtomicWriteBool(&pThis->fEverHadSignallers, true);
RTLockValidatorRecSharedResetOwner(&pThis->Signallers, hThread, NULL);
#endif
}
RTDECL(void) RTSemEventAddSignaller(RTSEMEVENT hEventSem, RTTHREAD hThread)
{
#ifdef RTSEMEVENT_STRICT
struct RTSEMEVENTINTERNAL *pThis = hEventSem;
AssertPtrReturnVoid(pThis);
AssertReturnVoid(pThis->u32Magic == RTSEMEVENT_MAGIC);
ASMAtomicWriteBool(&pThis->fEverHadSignallers, true);
RTLockValidatorRecSharedAddOwner(&pThis->Signallers, hThread, NULL);
#endif
}
RTDECL(void) RTSemEventRemoveSignaller(RTSEMEVENT hEventSem, RTTHREAD hThread)
{
#ifdef RTSEMEVENT_STRICT
struct RTSEMEVENTINTERNAL *pThis = hEventSem;
AssertPtrReturnVoid(pThis);
AssertReturnVoid(pThis->u32Magic == RTSEMEVENT_MAGIC);
RTLockValidatorRecSharedRemoveOwner(&pThis->Signallers, hThread);
#endif
}