зеркало из https://github.com/mozilla/gecko-dev.git
87 строки
3.3 KiB
C++
87 строки
3.3 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: NPL 1.1/GPL 2.0/LGPL 2.1
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*
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* The contents of this file are subject to the Netscape Public License
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* Version 1.1 (the "License"); you may not use this file except in
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* compliance with the License. You may obtain a copy of the License at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the License
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* for the specific language governing rights and limitations under the
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* License.
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*
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* The Original Code is mozilla.org code.
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*
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* The Initial Developer of the Original Code is
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* Netscape Communications Corporation.
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* Portions created by the Initial Developer are Copyright (C) 1998
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* the Initial Developer. All Rights Reserved.
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*
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* Contributor(s):
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*
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* Alternatively, the contents of this file may be used under the terms of
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* either the GNU General Public License Version 2 or later (the "GPL"), or
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* the GNU Lesser General Public License Version 2.1 or later (the "LGPL"),
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* in which case the provisions of the GPL or the LGPL are applicable instead
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* of those above. If you wish to allow use of your version of this file only
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* under the terms of either the GPL or the LGPL, and not to allow others to
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* use your version of this file under the terms of the NPL, indicate your
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* decision by deleting the provisions above and replace them with the notice
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* and other provisions required by the GPL or the LGPL. If you do not delete
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* the provisions above, a recipient may use your version of this file under
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* the terms of any one of the NPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#ifndef nsIArena_h___
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#define nsIArena_h___
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#include "nscore.h"
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#include "nsISupports.h"
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#define NS_MIN_ARENA_BLOCK_SIZE 64
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#define NS_DEFAULT_ARENA_BLOCK_SIZE 4096
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/// Interface IID for nsIArena
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#define NS_IARENA_IID \
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{ 0xa24fdad0, 0x93b4, 0x11d1, \
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{0x89, 0x5b, 0x00, 0x60, 0x08, 0x91, 0x1b, 0x81} }
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#define NS_ARENA_CONTRACTID "@mozilla.org/arena;1"
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#define NS_ARENA_CLASSNAME "Arena"
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/** Interface to a memory arena abstraction. Arena's use large blocks
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* of memory to allocate smaller objects. Arena's provide no free
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* operator; instead, all of the objects in the arena are deallocated
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* by deallocating the arena (e.g. when it's reference count goes to
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* zero)
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*/
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class nsIArena : public nsISupports {
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public:
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static const nsIID& GetIID() { static nsIID iid = NS_IARENA_IID; return iid; }
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NS_IMETHOD Init(PRUint32 arenaBlockSize) = 0;
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NS_IMETHOD_(void*) Alloc(PRUint32 size) = 0;
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};
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/**
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* Create a new arena using the desired block size for allocating the
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* underlying memory blocks. The underlying memory blocks are allocated
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* using the PR heap.
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*/
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extern NS_COM nsresult NS_NewHeapArena(nsIArena** aInstancePtrResult,
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PRUint32 aArenaBlockSize = 0);
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#define NS_ARENA_CID \
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{ /* 9832ec80-0d6b-11d3-9331-00104ba0fd40 */ \
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0x9832ec80, \
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0x0d6b, \
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0x11d3, \
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{0x93, 0x31, 0x00, 0x10, 0x4b, 0xa0, 0xfd, 0x40} \
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}
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#endif /* nsIArena_h___ */
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