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72 lines
2.4 KiB
C++
72 lines
2.4 KiB
C++
/* -*- Mode: C++; tab-width: 2; indent-tabs-mode: nil; c-basic-offset: 2 -*-
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*
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* The contents of this file are subject to the Netscape Public
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* License Version 1.1 (the "License"); you may not use this file
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* except in compliance with the License. You may obtain a copy of
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* the License at http://www.mozilla.org/NPL/
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*
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* Software distributed under the License is distributed on an "AS
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* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
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* implied. See the License for the specific language governing
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* rights and limitations under the 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 Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All
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* Rights Reserved.
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*
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* Contributor(s):
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*/
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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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