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Diffstat (limited to 'src/VBox/Runtime/generic/tls-generic.cpp')
| -rw-r--r-- | src/VBox/Runtime/generic/tls-generic.cpp | 169 |
1 files changed, 169 insertions, 0 deletions
diff --git a/src/VBox/Runtime/generic/tls-generic.cpp b/src/VBox/Runtime/generic/tls-generic.cpp new file mode 100644 index 00000000..52898a1b --- /dev/null +++ b/src/VBox/Runtime/generic/tls-generic.cpp @@ -0,0 +1,169 @@ +/* $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); + } + } + } +} + |