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/* $Id: tls-generic.cpp $ */
/** @file
* IPRT - Thread Local Storage (TSL), Generic Implementation.
*/
/*
* Copyright (C) 2008-2023 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/thread.h>
#include "internal/iprt.h"
#include <iprt/errcore.h>
#include <iprt/asm.h>
#include <iprt/log.h>
#include <iprt/assert.h>
#include "internal/thread.h"
/*********************************************************************************************************************************
* Global Variables *
*********************************************************************************************************************************/
/** Allocation bitmap. Set bits indicates allocated entries. */
static uint32_t volatile g_au32AllocatedBitmap[(RTTHREAD_TLS_ENTRIES + 31) / 32];
/** Destructors for each of the TLS entries. */
static PFNRTTLSDTOR g_apfnDestructors[RTTHREAD_TLS_ENTRIES];
RTR3DECL(RTTLS) RTTlsAlloc(void)
{
RTTLS iTls;
int rc = RTTlsAllocEx(&iTls, NULL);
return RT_SUCCESS(rc) ? iTls : NIL_RTTLS;
}
RTR3DECL(int) RTTlsAllocEx(PRTTLS piTls, PFNRTTLSDTOR pfnDestructor)
{
for (unsigned i = 0; i < 128; i++)
{
int iTls = ASMBitFirstClear(&g_au32AllocatedBitmap[0], RTTHREAD_TLS_ENTRIES);
if (iTls < 0)
{
*piTls = NIL_RTTLS;
return VERR_NO_MEMORY;
}
if (!ASMAtomicBitTestAndSet(&g_au32AllocatedBitmap[0], iTls))
{
g_apfnDestructors[iTls] = pfnDestructor;
*piTls = iTls;
return VINF_SUCCESS;
}
}
AssertFailed();
return VERR_NO_MEMORY;
}
RTR3DECL(int) RTTlsFree(RTTLS iTls)
{
if (iTls == NIL_RTTLS)
return VINF_SUCCESS;
if ( iTls < 0
|| iTls >= RTTHREAD_TLS_ENTRIES
|| !ASMBitTest(&g_au32AllocatedBitmap[0], iTls))
return VERR_INVALID_PARAMETER;
ASMAtomicWriteNullPtr(&g_apfnDestructors[iTls]);
rtThreadClearTlsEntry(iTls);
ASMAtomicBitClear(&g_au32AllocatedBitmap[0], iTls);
return VINF_SUCCESS;
}
RTR3DECL(void *) RTTlsGet(RTTLS iTls)
{
void *pv;
int rc = RTTlsGetEx(iTls, &pv);
return RT_SUCCESS(rc) ? pv : NULL;
}
RTR3DECL(int) RTTlsGetEx(RTTLS iTls, void **ppvValue)
{
if (RT_UNLIKELY( iTls < 0
|| iTls >= RTTHREAD_TLS_ENTRIES
|| !ASMBitTest(&g_au32AllocatedBitmap[0], iTls)))
return VERR_INVALID_PARAMETER;
PRTTHREADINT pThread = rtThreadGet(RTThreadSelf());
AssertReturn(pThread, VERR_NOT_SUPPORTED);
void *pv = pThread->apvTlsEntries[iTls];
rtThreadRelease(pThread);
*ppvValue = pv;
return VINF_SUCCESS;
}
RTR3DECL(int) RTTlsSet(RTTLS iTls, void *pvValue)
{
if (RT_UNLIKELY( iTls < 0
|| iTls >= RTTHREAD_TLS_ENTRIES
|| !ASMBitTest(&g_au32AllocatedBitmap[0], iTls)))
return VERR_INVALID_PARAMETER;
PRTTHREADINT pThread = rtThreadGet(RTThreadSelf());
AssertReturn(pThread, VERR_NOT_SUPPORTED);
pThread->apvTlsEntries[iTls] = pvValue;
rtThreadRelease(pThread);
return VINF_SUCCESS;
}
/**
* Called at thread termination to invoke TLS destructors.
*
* @param pThread The current thread.
*/
DECLHIDDEN(void) rtThreadTlsDestruction(PRTTHREADINT pThread)
{
for (RTTLS iTls = 0; iTls < RTTHREAD_TLS_ENTRIES; iTls++)
{
void *pv = pThread->apvTlsEntries[iTls];
if (pv)
{
PFNRTTLSDTOR pfnDestructor = (PFNRTTLSDTOR)(uintptr_t)ASMAtomicUoReadPtr((void * volatile *)(uintptr_t)&g_apfnDestructors[iTls]);
if (pfnDestructor)
{
pThread->apvTlsEntries[iTls] = NULL;
pfnDestructor(pv);
}
}
}
}
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