/* $Id: semevent-win.cpp 82968 2020-02-04 10:35:17Z vboxsync $ */ /** @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 #include #include "internal/iprt.h" #include #include #include #include #include #include #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 }