mirror of
https://github.com/mirror/processhacker
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wj32
7bd28e4357
git-svn-id: svn://svn.code.sf.net/p/processhacker/code@2304 21ef857c-d57f-4fe0-8362-d861dc6d29cd
138 lines
4.0 KiB
C
138 lines
4.0 KiB
C
/*
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* Process Hacker Driver -
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* internal object manager
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*
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* Copyright (C) 2009 wj32
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*
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* This file is part of Process Hacker.
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*
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* Process Hacker is free software; you can redistribute it and/or modify
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* it under the terms of the GNU General Public License as published by
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* the Free Software Foundation, either version 3 of the License, or
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* (at your option) any later version.
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*
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* Process Hacker is distributed in the hope that it will be useful,
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* but WITHOUT ANY WARRANTY; without even the implied warranty of
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* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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* GNU General Public License for more details.
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*
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* You should have received a copy of the GNU General Public License
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* along with Process Hacker. If not, see <http://www.gnu.org/licenses/>.
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*/
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#ifndef _REFP_H
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#define _REFP_H
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#define _REF_PRIVATE
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#include "ref.h"
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#include "sync.h"
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#define TAG_KPHOBJ ('bOhP')
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#define KphObjectToObjectHeader(Object) ((PKPH_OBJECT_HEADER)CONTAINING_RECORD((PCHAR)(Object), KPH_OBJECT_HEADER, Body))
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#define KphObjectHeaderToObject(ObjectHeader) (&((PKPH_OBJECT_HEADER)(ObjectHeader))->Body)
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#define KphpAddObjectHeaderSize(Size) ((Size) + sizeof(KPH_OBJECT_HEADER) - sizeof(QUAD))
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typedef struct _KPH_OBJECT_HEADER *PKPH_OBJECT_HEADER;
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typedef struct _KPH_OBJECT_TYPE *PKPH_OBJECT_TYPE;
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typedef struct _KPH_OBJECT_HEADER
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{
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/* The reference count of the object. */
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LONG RefCount;
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/* The flags that were used to create the object. */
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ULONG Flags;
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union
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{
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/* The size of the object, excluding the header. */
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SIZE_T Size;
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/* A pointer to the object header of the next object to free. */
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PKPH_OBJECT_HEADER NextToFree;
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};
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/* The type of the object. */
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PKPH_OBJECT_TYPE Type;
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/* A linked list entry for an optional object manager object list.
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* For example, this may be used to free all objects when the
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* driver exits.
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*/
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LIST_ENTRY GlobalObjectListEntry;
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/* The body of the object. For use by the KphObject(Header)ToObject(Header) macros. */
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QUAD Body;
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} KPH_OBJECT_HEADER, *PKPH_OBJECT_HEADER;
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typedef struct _KPH_OBJECT_TYPE
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{
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/* The default pool type for objects of this type, used when the
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* pool type is not specified when an object is created. */
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POOL_TYPE DefaultPoolType;
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/* The flags that were used to create the object type. */
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ULONG Flags;
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/* An optional procedure called when objects of this type are freed. */
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PKPH_TYPE_DELETE_PROCEDURE DeleteProcedure;
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/* The total number of objects of this type that are alive. */
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ULONG NumberOfObjects;
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} KPH_OBJECT_TYPE, *PKPH_OBJECT_TYPE;
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/* KphpInterlockedIncrementSafe
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*
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* Increments a reference count, but will never increment
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* from 0 to 1.
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*/
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FORCEINLINE BOOLEAN KphpInterlockedIncrementSafe(
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__inout PLONG RefCount
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)
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{
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LONG refCount;
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/* Here we will attempt to increment the reference count,
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* making sure that it is not 0.
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*/
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while (TRUE)
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{
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refCount = *RefCount;
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/* Check if the reference count is 0. If it is, the
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* object is being or about to be deleted.
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*/
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if (refCount == 0)
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return FALSE;
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/* Try to increment the reference count. */
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if (InterlockedCompareExchange(
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RefCount,
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refCount + 1,
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refCount
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) == refCount)
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{
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/* Success. */
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return TRUE;
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}
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/* Someone else changed the reference count before we did.
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* Go back and try again.
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*/
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}
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}
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PKPH_OBJECT_HEADER KphpAllocateObject(
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__in SIZE_T ObjectSize,
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__in POOL_TYPE PoolType
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);
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VOID KphpDeferDeleteObject(
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__in PKPH_OBJECT_HEADER ObjectHeader
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);
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VOID KphpDeferDeleteObjectRoutine(
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__in PVOID Parameter
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);
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VOID KphpFreeObject(
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__in PKPH_OBJECT_HEADER ObjectHeader
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);
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#endif
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