Adding upstream version 6.1.22-dfsg.upstream/6.1.22-dfsgupstream

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

1 files changed, 304 insertions, 0 deletions

diff --git a/src/VBox/Runtime/common/misc/handletablesimple.cpp b/src/VBox/Runtime/common/misc/handletablesimple.cpp
new file mode 100644
index 00000000..3153194b
--- /dev/null
+++ b/src/VBox/Runtime/common/misc/handletablesimple.cpp
@@ -0,0 +1,304 @@
+/* $Id: handletablesimple.cpp $ */
+/** @file
+ * IPRT - Handle Tables.
+ */
+
+/*
+ * Copyright (C) 2008-2020 Oracle Corporation
+ *
+ * This file is part of VirtualBox Open Source Edition (OSE), as
+ * available from http://www.virtualbox.org. This file is free software;
+ * you can redistribute it and/or modify it under the terms of the GNU
+ * General Public License (GPL) as published by the Free Software
+ * Foundation, in version 2 as it comes in the "COPYING" file of the
+ * VirtualBox OSE distribution. VirtualBox OSE is distributed in the
+ * hope that it will be useful, but WITHOUT ANY WARRANTY of any kind.
+ *
+ * The contents of this file may alternatively be used under the terms
+ * of the Common Development and Distribution License Version 1.0
+ * (CDDL) only, as it comes in the "COPYING.CDDL" file of the
+ * VirtualBox OSE 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.
+ */
+
+
+/*********************************************************************************************************************************
+*   Header Files                                                                                                                 *
+*********************************************************************************************************************************/
+#include <iprt/handletable.h>
+#include "internal/iprt.h"
+
+#include <iprt/mem.h>
+#include <iprt/spinlock.h>
+#include <iprt/err.h>
+#include <iprt/assert.h>
+#include <iprt/param.h>
+#include <iprt/string.h>
+#include <iprt/asm.h>
+#include "internal/magics.h"
+#include "handletable.h"
+
+
+RTDECL(int)     RTHandleTableAlloc(RTHANDLETABLE hHandleTable, void *pvObj, uint32_t *ph)
+{
+    /* validate the input */
+    PRTHANDLETABLEINT pThis = (PRTHANDLETABLEINT)hHandleTable;
+    AssertPtrReturn(pThis, VERR_INVALID_HANDLE);
+    AssertReturn(pThis->u32Magic == RTHANDLETABLE_MAGIC, VERR_INVALID_HANDLE);
+    AssertReturn(!(pThis->fFlags & RTHANDLETABLE_FLAGS_CONTEXT), VERR_INVALID_FUNCTION);
+    AssertReturn(!RTHT_IS_FREE(pvObj), VERR_INVALID_PARAMETER);
+    AssertPtrReturn(ph, VERR_INVALID_POINTER);
+    *ph = pThis->uBase - 1;
+
+    /*
+     * Allocation loop.
+     */
+    rtHandleTableLock(pThis);
+
+    int rc;
+    do
+    {
+        /*
+         * Try grab a free entry from the head of the free list.
+         */
+        uint32_t i = pThis->iFreeHead;
+        if (i != NIL_RTHT_INDEX)
+        {
+            PRTHTENTRYFREE pFree = (PRTHTENTRYFREE)rtHandleTableLookupSimpleIdx(pThis, i);
+            Assert(pFree);
+            if (i == pThis->iFreeTail)
+                pThis->iFreeTail = pThis->iFreeHead = NIL_RTHT_INDEX;
+            else
+                pThis->iFreeHead = RTHT_GET_FREE_IDX(pFree);
+            pThis->cCurAllocated++;
+            Assert(pThis->cCurAllocated <= pThis->cCur);
+
+            /*
+             * Setup the entry and return.
+             */
+            PRTHTENTRY pEntry = (PRTHTENTRY)pFree;
+            pEntry->pvObj = pvObj;
+            *ph = i + pThis->uBase;
+            rc = VINF_SUCCESS;
+        }
+        /*
+         * Must expand the handle table, unless it's full.
+         */
+        else if (pThis->cCur >= pThis->cMax)
+        {
+            rc = VERR_NO_MORE_HANDLES;
+            Assert(pThis->cCur == pThis->cCurAllocated);
+        }
+        else
+        {
+            /*
+             * Do we have to expand the 1st level table too?
+             */
+            uint32_t const iLevel1 = pThis->cCur / RTHT_LEVEL2_ENTRIES;
+            uint32_t cLevel1 = iLevel1 >= pThis->cLevel1
+                             ? pThis->cLevel1 + PAGE_SIZE / sizeof(void *)
+                             : 0;
+            if (cLevel1 > pThis->cMax / RTHT_LEVEL2_ENTRIES)
+                cLevel1 = pThis->cMax / RTHT_LEVEL2_ENTRIES;
+            Assert(!cLevel1 || pThis->cMax / RTHT_LEVEL2_ENTRIES >= RTHT_LEVEL1_DYN_ALLOC_THRESHOLD);
+
+            /* leave the lock (never do fancy stuff from behind a spinlock). */
+            rtHandleTableUnlock(pThis);
+
+            /*
+             * Do the allocation(s).
+             */
+            rc = VERR_TRY_AGAIN;
+            void **papvLevel1 = NULL;
+            if (cLevel1)
+            {
+                papvLevel1 = (void **)RTMemAlloc(sizeof(void *) * cLevel1);
+                if (!papvLevel1)
+                    return VERR_NO_MEMORY;
+            }
+
+            PRTHTENTRY paTable = (PRTHTENTRY)RTMemAlloc(sizeof(*paTable) * RTHT_LEVEL2_ENTRIES);
+            if (!paTable)
+            {
+                RTMemFree(papvLevel1);
+                return VERR_NO_MEMORY;
+            }
+
+            /* re-enter the lock. */
+            rtHandleTableLock(pThis);
+
+            /*
+             * Insert the new bits, but be a bit careful as someone might have
+             * raced us expanding the table.
+             */
+            /* deal with the 1st level lookup expansion first */
+            if (cLevel1)
+            {
+                Assert(papvLevel1);
+                if (cLevel1 > pThis->cLevel1)
+                {
+                    /* Replace the 1st level table. */
+                    memcpy(papvLevel1, pThis->papvLevel1, sizeof(void *) * pThis->cLevel1);
+                    memset(&papvLevel1[pThis->cLevel1], 0, sizeof(void *) * (cLevel1 - pThis->cLevel1));
+                    pThis->cLevel1 = cLevel1;
+                    void **papvTmp = pThis->papvLevel1;
+                    pThis->papvLevel1 = papvLevel1;
+                    papvLevel1 = papvTmp;
+                }
+
+                /* free the obsolete one (outside the lock of course) */
+                rtHandleTableUnlock(pThis);
+                RTMemFree(papvLevel1);
+                rtHandleTableLock(pThis);
+            }
+
+            /* insert the table we allocated. */
+            uint32_t iLevel1New = pThis->cCur / RTHT_LEVEL2_ENTRIES;
+            if (    iLevel1New < pThis->cLevel1
+                &&  pThis->cCur < pThis->cMax)
+            {
+                pThis->papvLevel1[iLevel1New] = paTable;
+
+                /* link all entries into a free list. */
+                Assert(!(pThis->cCur % RTHT_LEVEL2_ENTRIES));
+                for (i = 0; i < RTHT_LEVEL2_ENTRIES - 1; i++)
+                    RTHT_SET_FREE_IDX((PRTHTENTRYFREE)&paTable[i], i + 1 + pThis->cCur);
+                RTHT_SET_FREE_IDX((PRTHTENTRYFREE)&paTable[RTHT_LEVEL2_ENTRIES - 1], NIL_RTHT_INDEX);
+
+                /* join the free list with the other. */
+                if (pThis->iFreeTail == NIL_RTHT_INDEX)
+                    pThis->iFreeHead = pThis->cCur;
+                else
+                {
+                    PRTHTENTRYFREE pPrev = (PRTHTENTRYFREE)rtHandleTableLookupSimpleIdx(pThis, pThis->iFreeTail);
+                    Assert(pPrev);
+                    RTHT_SET_FREE_IDX(pPrev, pThis->cCur);
+                }
+                pThis->iFreeTail = pThis->cCur + RTHT_LEVEL2_ENTRIES - 1;
+
+                pThis->cCur += RTHT_LEVEL2_ENTRIES;
+            }
+            else
+            {
+                /* free the table (raced someone, and we lost). */
+                rtHandleTableUnlock(pThis);
+                RTMemFree(paTable);
+                rtHandleTableLock(pThis);
+            }
+
+            rc = VERR_TRY_AGAIN;
+        }
+    } while (rc == VERR_TRY_AGAIN);
+
+    rtHandleTableUnlock(pThis);
+
+    return rc;
+}
+RT_EXPORT_SYMBOL(RTHandleTableAlloc);
+
+
+RTDECL(void *)  RTHandleTableLookup(RTHANDLETABLE hHandleTable, uint32_t h)
+{
+    /* validate the input */
+    PRTHANDLETABLEINT pThis = (PRTHANDLETABLEINT)hHandleTable;
+    AssertPtrReturn(pThis, NULL);
+    AssertReturn(pThis->u32Magic == RTHANDLETABLE_MAGIC, NULL);
+    AssertReturn(!(pThis->fFlags & RTHANDLETABLE_FLAGS_CONTEXT), NULL);
+
+    void *pvObj = NULL;
+
+    /* acquire the lock */
+    rtHandleTableLock(pThis);
+
+    /*
+     * Perform the lookup and retaining.
+     */
+    PRTHTENTRY pEntry = rtHandleTableLookupSimple(pThis, h);
+    if (pEntry)
+    {
+        pvObj = pEntry->pvObj;
+        if (!RTHT_IS_FREE(pvObj))
+        {
+            if (pThis->pfnRetain)
+            {
+                int rc = pThis->pfnRetain(hHandleTable, pEntry->pvObj, NULL, pThis->pvRetainUser);
+                if (RT_FAILURE(rc))
+                    pvObj = NULL;
+            }
+        }
+        else
+            pvObj = NULL;
+    }
+
+    /* release the lock */
+    rtHandleTableUnlock(pThis);
+    return pvObj;
+}
+RT_EXPORT_SYMBOL(RTHandleTableLookup);
+
+
+RTDECL(void *)  RTHandleTableFree(RTHANDLETABLE hHandleTable, uint32_t h)
+{
+    /* validate the input */
+    PRTHANDLETABLEINT pThis = (PRTHANDLETABLEINT)hHandleTable;
+    AssertPtrReturn(pThis, NULL);
+    AssertReturn(pThis->u32Magic == RTHANDLETABLE_MAGIC, NULL);
+    AssertReturn(!(pThis->fFlags & RTHANDLETABLE_FLAGS_CONTEXT), NULL);
+
+    void *pvObj = NULL;
+
+    /* acquire the lock */
+    rtHandleTableLock(pThis);
+
+    /*
+     * Perform the lookup and retaining.
+     */
+    PRTHTENTRY pEntry = rtHandleTableLookupSimple(pThis, h);
+    if (pEntry)
+    {
+        pvObj = pEntry->pvObj;
+        if (!RTHT_IS_FREE(pvObj))
+        {
+            if (pThis->pfnRetain)
+            {
+                int rc = pThis->pfnRetain(hHandleTable, pEntry->pvObj, NULL, pThis->pvRetainUser);
+                if (RT_FAILURE(rc))
+                    pvObj = NULL;
+            }
+
+            /*
+             * Link it into the free list.
+             */
+            if (pvObj)
+            {
+                PRTHTENTRYFREE pFree = (PRTHTENTRYFREE)pEntry;
+                RTHT_SET_FREE_IDX(pFree, NIL_RTHT_INDEX);
+
+                uint32_t const i = h - pThis->uBase;
+                if (pThis->iFreeTail == NIL_RTHT_INDEX)
+                    pThis->iFreeHead = pThis->iFreeTail = i;
+                else
+                {
+                    PRTHTENTRYFREE pPrev = (PRTHTENTRYFREE)rtHandleTableLookupSimpleIdx(pThis, pThis->iFreeTail);
+                    Assert(pPrev);
+                    RTHT_SET_FREE_IDX(pPrev, i);
+                    pThis->iFreeTail = i;
+                }
+
+                Assert(pThis->cCurAllocated > 0);
+                pThis->cCurAllocated--;
+            }
+        }
+        else
+            pvObj = NULL;
+    }
+
+    /* release the lock */
+    rtHandleTableUnlock(pThis);
+    return pvObj;
+}
+RT_EXPORT_SYMBOL(RTHandleTableFree);
+