Adding upstream version 7.0.14-dfsg.upstream/7.0.14-dfsg

Signed-off-by: Daniel Baumann <daniel.baumann@progress-linux.org>

1 files changed, 238 insertions, 0 deletions

diff --git a/src/VBox/Runtime/r3/nocrt-per-thread-2.cpp b/src/VBox/Runtime/r3/nocrt-per-thread-2.cpp
new file mode 100644
index 00000000..9179d33a
--- /dev/null
+++ b/src/VBox/Runtime/r3/nocrt-per-thread-2.cpp
@@ -0,0 +1,238 @@
+/* $Id: nocrt-per-thread-2.cpp $ */
+/** @file
+ * IPRT - No-Crt - Per Thread Data, Managment code
+ */
+
+/*
+ * Copyright (C) 2006-2023 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
+ */
+
+
+/*********************************************************************************************************************************
+*   Defined Constants And Macros                                                                                                 *
+*********************************************************************************************************************************/
+#include "internal/nocrt.h"
+#include <iprt/asm.h>
+#include <iprt/critsect.h>
+#include <iprt/errcore.h>
+#include <iprt/mem.h>
+#include <iprt/once.h>
+#include <iprt/thread.h>
+
+
+/*********************************************************************************************************************************
+*   Global Variables                                                                                                             *
+*********************************************************************************************************************************/
+/** Init/term once state. */
+static RTONCE               g_NoCrtPerThreadOnce = RTONCE_INITIALIZER;
+
+/** List of heap allocations (PRTNOCRTTHREADDATA).   */
+static RTLISTANCHOR         g_NoCrtPerThreadHeapList;
+/** Critical section protecting g_NoCrtPerThreadHeapList. */
+static RTCRITSECT           g_NoCrtPerThreadCritSect;
+
+/** Allocation bitmap for g_aNoCrtPerThreadStatic.
+ *
+ * In debug builds we only have one slot here, so we have a better chance of
+ * testing the heap code path. */
+#ifdef DEBUG
+static uint32_t volatile    g_fNoCrtPerThreadStaticAlloc = UINT32_C(0xffffefff);
+#else
+static uint32_t volatile    g_fNoCrtPerThreadStaticAlloc = 0;
+#endif
+/* Static allocations to avoid the heap and associate slowness. */
+static RTNOCRTTHREADDATA    g_aNoCrtPerThreadStatic[32];
+
+
+/**
+ * @callback_method_impl{FNRTTLSDTOR}
+ */
+static DECLCALLBACK(void) rtNoCrtPerThreadDtor(void *pvValue)
+{
+    PRTNOCRTTHREADDATA pNoCrtData = (PRTNOCRTTHREADDATA)pvValue;
+    if (pNoCrtData->enmAllocType == RTNOCRTTHREADDATA::kAllocType_Heap)
+    {
+        AssertReturnVoid(RTOnceWasInitialized(&g_NoCrtPerThreadOnce));
+
+        RTCritSectEnter(&g_NoCrtPerThreadCritSect); /* timeout? */
+
+        RTListNodeRemove(&pNoCrtData->ListEntry);
+        pNoCrtData->enmAllocType = RTNOCRTTHREADDATA::kAllocType_End;
+
+        RTCritSectLeave(&g_NoCrtPerThreadCritSect);
+
+        RTMemFree(pNoCrtData);
+    }
+    else if (pNoCrtData->enmAllocType == RTNOCRTTHREADDATA::kAllocType_Static)
+    {
+        size_t iSlot = (size_t)(pNoCrtData - &g_aNoCrtPerThreadStatic[0]);
+        AssertReturnVoid(iSlot < RT_ELEMENTS(g_aNoCrtPerThreadStatic));
+
+        pNoCrtData->enmAllocType = RTNOCRTTHREADDATA::kAllocType_Invalid;
+        ASMAtomicAndU32(&g_fNoCrtPerThreadStaticAlloc, ~(uint32_t)iSlot);
+    }
+}
+
+
+/**
+ * @callback_method_impl{FNRTONCE}
+ */
+static DECLCALLBACK(int32_t) rtNoCrtPerThreadInit(void *pvUser)
+{
+    RTListInit(&g_NoCrtPerThreadHeapList);
+
+    RTTLS iTls = NIL_RTTLS;
+    int rc = RTTlsAllocEx(&iTls, rtNoCrtPerThreadDtor);
+    if (iTls != NIL_RTTLS)
+    {
+        rc = RTCritSectInit(&g_NoCrtPerThreadCritSect);
+        if (RT_SUCCESS(rc))
+        {
+            g_iTlsRtNoCrtPerThread = iTls;
+            return VINF_SUCCESS;
+        }
+        RTTlsFree(iTls);
+    }
+    RT_NOREF(pvUser);
+    return rc;
+}
+
+
+/**
+ * @callback_method_impl{FNRTONCECLEANUP}
+ */
+static DECLCALLBACK(void) rtNoCrtPerThreadCleanup(void *pvUser, bool fLazyCleanUpOk)
+{
+    RT_NOREF(pvUser);
+    if (fLazyCleanUpOk)
+        return;
+
+    /*
+     * First destroy the TLS entry.
+     */
+    RTTLS iTls = g_iTlsRtNoCrtPerThread;
+    g_iTlsRtNoCrtPerThread = NIL_RTTLS;
+    int rc = RTTlsFree(iTls);
+    AssertRC(rc);
+
+    /*
+     * Then destroy the critical section and free all entries in the list.
+     */
+    RTCritSectDelete(&g_NoCrtPerThreadCritSect);
+
+    PRTNOCRTTHREADDATA pNoCrtData;
+    while ((pNoCrtData = RTListRemoveFirst(&g_NoCrtPerThreadHeapList, RTNOCRTTHREADDATA, ListEntry)) != NULL)
+    {
+        AssertContinue(pNoCrtData->enmAllocType == RTNOCRTTHREADDATA::kAllocType_Heap);
+        pNoCrtData->enmAllocType = RTNOCRTTHREADDATA::kAllocType_End;
+        RTMemFree(pNoCrtData);
+    }
+}
+
+PRTNOCRTTHREADDATA rtNoCrtThreadDataGet(void)
+{
+    int rc = RTOnceEx(&g_NoCrtPerThreadOnce, rtNoCrtPerThreadInit, rtNoCrtPerThreadCleanup, NULL);
+    if (RT_SUCCESS(rc))
+    {
+        /*
+         * We typically have an entry already.
+         */
+        PRTNOCRTTHREADDATA pNoCrtData = (PRTNOCRTTHREADDATA)RTTlsGet(g_iTlsRtNoCrtPerThread);
+        if (pNoCrtData)
+        {
+            AssertReturn(   pNoCrtData->enmAllocType > RTNOCRTTHREADDATA::kAllocType_Invalid
+                         && pNoCrtData->enmAllocType < RTNOCRTTHREADDATA::kAllocType_End,
+                         NULL);
+            return pNoCrtData;
+        }
+
+        /*
+         * Okay, allocate a new entry first using some of the statically allocated
+         * ones then falling back on heap allocations.
+         */
+        for (;;)
+        {
+            uint32_t const  fAlloc = ASMAtomicUoReadU32(&g_fNoCrtPerThreadStaticAlloc);
+            uint32_t        iSlot  = ASMBitFirstSetU32(~fAlloc);
+            if (iSlot != 0)
+                iSlot--;
+            else
+                break;
+            if (ASMAtomicCmpXchgU32(&g_fNoCrtPerThreadStaticAlloc, fAlloc | RT_BIT_32(iSlot), fAlloc))
+            {
+                pNoCrtData = &g_aNoCrtPerThreadStatic[iSlot];
+
+                /* Init the entry in case it's being re-used: */
+                Assert(pNoCrtData->enmAllocType == RTNOCRTTHREADDATA::kAllocType_Invalid);
+                rc = RTTlsSet(g_iTlsRtNoCrtPerThread, pNoCrtData);
+                AssertRC(rc);
+                if (RT_SUCCESS(rc))
+                {
+                    pNoCrtData->enmAllocType = RTNOCRTTHREADDATA::kAllocType_Static;
+                    RTListInit(&pNoCrtData->ListEntry);
+                    pNoCrtData->iErrno      = 0;
+                    pNoCrtData->pszStrToken = NULL;
+                    return pNoCrtData;
+                }
+
+                ASMAtomicOrU32(&g_fNoCrtPerThreadStaticAlloc, RT_BIT_32(iSlot));
+                return NULL;
+            }
+            ASMNopPause();
+        }
+
+        /*
+         * Heap.
+         */
+        pNoCrtData = (PRTNOCRTTHREADDATA)RTMemAllocZ(sizeof(*pNoCrtData));
+        if (pNoCrtData)
+        {
+            pNoCrtData->enmAllocType = RTNOCRTTHREADDATA::kAllocType_Heap;
+
+            RTCritSectEnter(&g_NoCrtPerThreadCritSect);
+            RTListAppend(&g_NoCrtPerThreadHeapList, &pNoCrtData->ListEntry);
+            RTCritSectLeave(&g_NoCrtPerThreadCritSect);
+
+            rc = RTTlsSet(g_iTlsRtNoCrtPerThread, pNoCrtData);
+            AssertRC(rc);
+            if (RT_SUCCESS(rc))
+                return pNoCrtData;
+
+            RTCritSectEnter(&g_NoCrtPerThreadCritSect);
+            RTListNodeRemove(&pNoCrtData->ListEntry);
+            RTCritSectLeave(&g_NoCrtPerThreadCritSect);
+
+            pNoCrtData->enmAllocType = RTNOCRTTHREADDATA::kAllocType_End;
+            RTMemFree(pNoCrtData);
+        }
+    }
+    return NULL;
+}
+