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authorDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:17:27 +0000
committerDaniel Baumann <daniel.baumann@progress-linux.org>2024-04-11 08:17:27 +0000
commitf215e02bf85f68d3a6106c2a1f4f7f063f819064 (patch)
tree6bb5b92c046312c4e95ac2620b10ddf482d3fa8b /src/VBox/Runtime/generic/tls-generic.cpp
parentInitial commit. (diff)
downloadvirtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.tar.xz
virtualbox-f215e02bf85f68d3a6106c2a1f4f7f063f819064.zip
Adding upstream version 7.0.14-dfsg.upstream/7.0.14-dfsg
Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>
Diffstat (limited to 'src/VBox/Runtime/generic/tls-generic.cpp')
-rw-r--r--src/VBox/Runtime/generic/tls-generic.cpp169
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
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+++ b/src/VBox/Runtime/generic/tls-generic.cpp
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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);
+ }
+ }
+ }
+}
+