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/* $Id: semevent-win.cpp $ */
/** @file
* IPRT - Event Semaphore, Windows.
*/
/*
* Copyright (C) 2006-2020 Oracle Corporation
*
* 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.
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP RTLOGGROUP_SEMAPHORE
#include <iprt/win/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/mem.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
/** The creation flags. */
uint32_t fFlags;
};
RTDECL(int) RTSemEventCreate(PRTSEMEVENT phEventSem)
{
return RTSemEventCreateEx(phEventSem, 0 /*fFlags*/, NIL_RTLOCKVALCLASS, NULL);
}
RTDECL(int) RTSemEventCreateEx(PRTSEMEVENT phEventSem, uint32_t fFlags, RTLOCKVALCLASS hClass, const char *pszNameFmt, ...)
{
AssertReturn(!(fFlags & ~(RTSEMEVENT_FLAGS_NO_LOCK_VAL | RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)), VERR_INVALID_PARAMETER);
Assert(!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK) || (fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL));
struct RTSEMEVENTINTERNAL *pThis;
if (!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK))
pThis = (struct RTSEMEVENTINTERNAL *)RTMemAlloc(sizeof(*pThis));
else
pThis = (struct RTSEMEVENTINTERNAL *)rtMemBaseAlloc(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;
pThis->fFlags = fFlags;
#ifdef RTSEMEVENT_STRICT
if (!pszNameFmt)
{
static uint32_t volatile s_iSemEventAnon = 0;
RTLockValidatorRecSharedInit(&pThis->Signallers, hClass, RTLOCKVAL_SUB_CLASS_ANY, pThis,
true /*fSignaller*/, !(fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL),
"RTSemEvent-%u", ASMAtomicIncU32(&s_iSemEventAnon) - 1);
}
else
{
va_list va;
va_start(va, pszNameFmt);
RTLockValidatorRecSharedInitV(&pThis->Signallers, hClass, RTLOCKVAL_SUB_CLASS_ANY, pThis,
true /*fSignaller*/, !(fFlags & RTSEMEVENT_FLAGS_NO_LOCK_VAL),
pszNameFmt, va);
va_end(va);
}
pThis->fEverHadSignallers = false;
#else
RT_NOREF_PV(hClass); RT_NOREF_PV(pszNameFmt);
#endif
*phEventSem = pThis;
return VINF_SUCCESS;
}
DWORD dwErr = GetLastError();
if (!(fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK))
RTMemFree(pThis);
else
rtMemBaseFree(pThis);
return RTErrConvertFromWin32(dwErr);
}
RTDECL(int) RTSemEventDestroy(RTSEMEVENT hEventSem)
{
struct RTSEMEVENTINTERNAL *pThis = hEventSem;
if (pThis == NIL_RTSEMEVENT)
return VINF_SUCCESS;
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
if (!(pThis->fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK))
RTMemFree(pThis);
else
rtMemBaseFree(pThis);
}
else
{
DWORD dwErr = GetLastError();
rc = RTErrConvertFromWin32(dwErr);
AssertMsgFailed(("Destroy hEventSem %p failed, lasterr=%u (%Rrc)\n", pThis, dwErr, rc));
/* Leak it. */
}
return rc;
}
RTDECL(int) RTSemEventSignal(RTSEMEVENT hEventSem)
{
/*
* Validate input.
*/
struct RTSEMEVENTINTERNAL *pThis = hEventSem;
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 hEventSem %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 hEventSem %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));
RT_NOREF_PV(pThis);
return VERR_INTERNAL_ERROR;
}
}
}
#undef RTSemEventWaitNoResume
RTDECL(int) RTSemEventWaitNoResume(RTSEMEVENT hEventSem, RTMSINTERVAL cMillies)
{
/*
* Validate input.
*/
struct RTSEMEVENTINTERNAL *pThis = hEventSem;
AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
AssertReturn(pThis->u32Magic == RTSEMEVENT_MAGIC, VERR_INVALID_HANDLE);
/*
* Wait for condition.
*/
#ifdef RTSEMEVENT_STRICT
RTTHREAD hThreadSelf = !(pThis->fFlags & RTSEMEVENT_FLAGS_BOOTSTRAP_HACK)
? RTThreadSelfAutoAdopt()
: RTThreadSelf();
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, NULL /*pSrcPos*/, false,
cMillies, 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);
#else
RT_NOREF_PV(hEventSem); RT_NOREF_PV(hThread);
#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);
#else
RT_NOREF_PV(hEventSem); RT_NOREF_PV(hThread);
#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);
#else
RT_NOREF_PV(hEventSem); RT_NOREF_PV(hThread);
#endif
}
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