mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-11-06 00:55:37 +00:00
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 -*-
|
|
*
|
|
* The contents of this file are subject to the Netscape Public
|
|
* License Version 1.1 (the "License"); you may not use this file
|
|
* except in compliance with the License. You may obtain a copy of
|
|
* the License at http://www.mozilla.org/NPL/
|
|
*
|
|
* Software distributed under the License is distributed on an "AS
|
|
* IS" basis, WITHOUT WARRANTY OF ANY KIND, either express or
|
|
* implied. See the License for the specific language governing
|
|
* rights and limitations under the License.
|
|
*
|
|
* The Original Code is mozilla.org code.
|
|
*
|
|
* The Initial Developer of the Original Code is Netscape
|
|
* Communications Corporation. Portions created by Netscape are
|
|
* Copyright (C) 1998 Netscape Communications Corporation. All
|
|
* Rights Reserved.
|
|
*
|
|
* Contributor(s):
|
|
*/
|
|
#ifndef nsIArena_h___
|
|
#define nsIArena_h___
|
|
|
|
#include "nscore.h"
|
|
#include "nsISupports.h"
|
|
|
|
#define NS_MIN_ARENA_BLOCK_SIZE 64
|
|
#define NS_DEFAULT_ARENA_BLOCK_SIZE 4096
|
|
|
|
/// Interface IID for nsIArena
|
|
#define NS_IARENA_IID \
|
|
{ 0xa24fdad0, 0x93b4, 0x11d1, \
|
|
{0x89, 0x5b, 0x00, 0x60, 0x08, 0x91, 0x1b, 0x81} }
|
|
#define NS_ARENA_CONTRACTID "@mozilla.org/arena;1"
|
|
#define NS_ARENA_CLASSNAME "Arena"
|
|
|
|
/** Interface to a memory arena abstraction. Arena's use large blocks
|
|
* of memory to allocate smaller objects. Arena's provide no free
|
|
* operator; instead, all of the objects in the arena are deallocated
|
|
* by deallocating the arena (e.g. when it's reference count goes to
|
|
* zero)
|
|
*/
|
|
class nsIArena : public nsISupports {
|
|
public:
|
|
static const nsIID& GetIID() { static nsIID iid = NS_IARENA_IID; return iid; }
|
|
|
|
NS_IMETHOD Init(PRUint32 arenaBlockSize) = 0;
|
|
|
|
NS_IMETHOD_(void*) Alloc(PRUint32 size) = 0;
|
|
};
|
|
|
|
/**
|
|
* Create a new arena using the desired block size for allocating the
|
|
* underlying memory blocks. The underlying memory blocks are allocated
|
|
* using the PR heap.
|
|
*/
|
|
extern NS_COM nsresult NS_NewHeapArena(nsIArena** aInstancePtrResult,
|
|
PRUint32 aArenaBlockSize = 0);
|
|
|
|
#define NS_ARENA_CID \
|
|
{ /* 9832ec80-0d6b-11d3-9331-00104ba0fd40 */ \
|
|
0x9832ec80, \
|
|
0x0d6b, \
|
|
0x11d3, \
|
|
{0x93, 0x31, 0x00, 0x10, 0x4b, 0xa0, 0xfd, 0x40} \
|
|
}
|
|
|
|
#endif /* nsIArena_h___ */
|
|
|
|
|