mirror of
https://github.com/mirror/processhacker
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wj32
e3d03e1c2c
* added PhTrimStringToNullTerminator git-svn-id: svn://svn.code.sf.net/p/processhacker/code@2587 21ef857c-d57f-4fe0-8362-d861dc6d29cd
151 lines
4.1 KiB
C
151 lines
4.1 KiB
C
/*
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* Process Hacker -
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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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/**
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* Gets a pointer to the object header for an object.
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*
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* \param Object A pointer to an object.
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*
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* \return A pointer to the object header of the object.
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*/
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#define PhObjectToObjectHeader(Object) ((PPH_OBJECT_HEADER)CONTAINING_RECORD((PCHAR)(Object), PH_OBJECT_HEADER, Body))
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/**
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* Gets a pointer to an object from an object header.
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*
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* \param ObjectHeader A pointer to an object header.
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*
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* \return A pointer to an object.
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*/
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#define PhObjectHeaderToObject(ObjectHeader) (&((PPH_OBJECT_HEADER)(ObjectHeader))->Body)
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/**
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* Calculates the total size to allocate for an object.
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*
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* \param Size The size of the object to allocate.
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*
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* \return The new size, including space for the object header.
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*/
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#define PhpAddObjectHeaderSize(Size) ((Size) + FIELD_OFFSET(PH_OBJECT_HEADER, Body))
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typedef struct _PH_OBJECT_HEADER *PPH_OBJECT_HEADER;
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typedef struct _PH_OBJECT_TYPE *PPH_OBJECT_TYPE;
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typedef struct _PH_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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PPH_OBJECT_HEADER NextToFree;
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};
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/** The type of the object. */
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PPH_OBJECT_TYPE Type;
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/** The body of the object. For use by the \ref PhObjectToObjectHeader
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* and \ref PhObjectHeaderToObject macros. */
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QUAD Body;
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} PH_OBJECT_HEADER, *PPH_OBJECT_HEADER;
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typedef struct _PH_OBJECT_TYPE
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{
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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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PPH_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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} PH_OBJECT_TYPE, *PPH_OBJECT_TYPE;
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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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* \param RefCount A pointer to a reference count.
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*/
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FORCEINLINE BOOLEAN PhpInterlockedIncrementSafe(
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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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PPH_OBJECT_HEADER PhpAllocateObject(
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__in SIZE_T ObjectSize
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);
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VOID PhpDeferDeleteObject(
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__in PPH_OBJECT_HEADER ObjectHeader
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);
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NTSTATUS PhpDeferDeleteObjectRoutine(
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__in PVOID Parameter
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);
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VOID PhpFreeObject(
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__in PPH_OBJECT_HEADER ObjectHeader
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);
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#endif
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