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/* $Id: tls-win.cpp $ */
/** @file
* IPRT - Thread Local Storage (TLS), Win32.
*/
/*
* Copyright (C) 2008-2022 Oracle and/or its affiliates.
*
* This file is part of VirtualBox base platform packages, as
* available from https://www.virtualbox.org.
*
* This program is free software; you can redistribute it and/or
* modify it under the terms of the GNU General Public License
* as published by the Free Software Foundation, in version 3 of the
* License.
*
* This program is distributed in the hope that it will be useful, but
* WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
* General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, see <https://www.gnu.org/licenses>.
*
* The contents of this file may alternatively be used under the terms
* of the Common Development and Distribution License Version 1.0
* (CDDL), a copy of it is provided in the "COPYING.CDDL" file included
* in the VirtualBox 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.
*
* SPDX-License-Identifier: GPL-3.0-only OR CDDL-1.0
*/
/*********************************************************************************************************************************
* Header Files *
*********************************************************************************************************************************/
#define LOG_GROUP RTLOGGROUP_THREAD
#include <iprt/win/windows.h>
#include <iprt/thread.h>
#include <iprt/assert.h>
#include <iprt/critsect.h>
#include <iprt/errcore.h>
#include <iprt/log.h>
#include <iprt/mem.h>
#include <iprt/once.h>
#include "internal/thread.h"
/*********************************************************************************************************************************
* Structures and Typedefs *
*********************************************************************************************************************************/
typedef struct RTTLSWINDTOR
{
RTLISTNODE ListEntry;
DWORD iTls;
PFNRTTLSDTOR pfnDestructor;
} RTTLSWINDTOR;
typedef RTTLSWINDTOR *PRTTLSWINDTOR;
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/** Init once for the list and critical section. */
static RTONCE g_Once = RTONCE_INITIALIZER;
/** Critical section protecting the TLS destructor list. */
static RTCRITSECTRW g_CritSect;
/** List of TLS destrictors (RTTLSWINDTOR). */
static RTLISTANCHOR g_TlsDtorHead;
/** Number of desturctors in the list (helps putting of initialization). */
static uint32_t volatile g_cTlsDtors = 0;
/**
* @callback_method_impl{FNRTONCE}
*/
static DECLCALLBACK(int32_t) rtTlsWinInitLock(void *pvUser)
{
RT_NOREF(pvUser);
RTListInit(&g_TlsDtorHead);
return RTCritSectRwInit(&g_CritSect);
}
RTR3DECL(RTTLS) RTTlsAlloc(void)
{
AssertCompile(sizeof(RTTLS) >= sizeof(DWORD));
DWORD iTls = TlsAlloc();
return iTls != TLS_OUT_OF_INDEXES ? (RTTLS)iTls : NIL_RTTLS;
}
RTR3DECL(int) RTTlsAllocEx(PRTTLS piTls, PFNRTTLSDTOR pfnDestructor)
{
int rc;
if (!pfnDestructor)
{
DWORD iTls = TlsAlloc();
if (iTls != TLS_OUT_OF_INDEXES)
{
Assert((RTTLS)iTls != NIL_RTTLS);
*piTls = (RTTLS)iTls;
Assert((DWORD)*piTls == iTls);
rc = VINF_SUCCESS;
}
else
rc = VERR_NO_MEMORY;
}
else
{
rc = RTOnce(&g_Once, rtTlsWinInitLock, NULL);
if (RT_SUCCESS(rc))
{
PRTTLSWINDTOR pDtor = (PRTTLSWINDTOR)RTMemAlloc(sizeof(*pDtor));
if (pDtor)
{
DWORD iTls = TlsAlloc();
if (iTls != TLS_OUT_OF_INDEXES)
{
Assert((RTTLS)iTls != NIL_RTTLS);
*piTls = (RTTLS)iTls;
Assert((DWORD)*piTls == iTls);
/*
* Add the destructor to the list. We keep it sorted.
*/
pDtor->iTls = iTls;
pDtor->pfnDestructor = pfnDestructor;
RTCritSectRwEnterExcl(&g_CritSect);
RTListAppend(&g_TlsDtorHead, &pDtor->ListEntry);
ASMAtomicIncU32(&g_cTlsDtors);
RTCritSectRwLeaveExcl(&g_CritSect);
rc = VINF_SUCCESS;
}
else
rc = VERR_NO_MEMORY;
}
else
rc = VERR_NO_MEMORY;
}
}
return rc;
}
RTR3DECL(int) RTTlsFree(RTTLS iTls)
{
if (iTls == NIL_RTTLS)
return VINF_SUCCESS;
if (TlsFree((DWORD)iTls))
{
if (ASMAtomicReadU32(&g_cTlsDtors) > 0)
{
RTCritSectRwEnterExcl(&g_CritSect);
PRTTLSWINDTOR pDtor;
RTListForEach(&g_TlsDtorHead, pDtor, RTTLSWINDTOR, ListEntry)
{
if (pDtor->iTls == (DWORD)iTls)
{
RTListNodeRemove(&pDtor->ListEntry);
ASMAtomicDecU32(&g_cTlsDtors);
RTMemFree(pDtor);
break;
}
}
RTCritSectRwLeaveExcl(&g_CritSect);
}
return VINF_SUCCESS;
}
return RTErrConvertFromWin32(GetLastError());
}
RTR3DECL(void *) RTTlsGet(RTTLS iTls)
{
return TlsGetValue((DWORD)iTls);
}
RTR3DECL(int) RTTlsGetEx(RTTLS iTls, void **ppvValue)
{
void *pv = TlsGetValue((DWORD)iTls);
if (pv)
{
*ppvValue = pv;
return VINF_SUCCESS;
}
/* TlsGetValue always updates last error */
*ppvValue = NULL;
return RTErrConvertFromWin32(GetLastError());
}
RTR3DECL(int) RTTlsSet(RTTLS iTls, void *pvValue)
{
if (TlsSetValue((DWORD)iTls, pvValue))
return VINF_SUCCESS;
return RTErrConvertFromWin32(GetLastError());
}
/**
* Called by dllmain-win.cpp when a thread detaches.
*/
DECLHIDDEN(void) rtThreadWinTlsDestruction(void)
{
if (ASMAtomicReadU32(&g_cTlsDtors) > 0)
{
RTCritSectRwEnterShared(&g_CritSect);
PRTTLSWINDTOR pDtor;
RTListForEach(&g_TlsDtorHead, pDtor, RTTLSWINDTOR, ListEntry)
{
void *pvValue = TlsGetValue(pDtor->iTls);
if (pvValue != NULL)
{
pDtor->pfnDestructor(pvValue);
TlsSetValue(pDtor->iTls, NULL);
}
}
RTCritSectRwLeaveShared(&g_CritSect);
}
}
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