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109 lines
3.4 KiB
C++
109 lines
3.4 KiB
C++
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*-
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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 1.0 (the "NPL"); you may not use this file except in
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* compliance with the NPL. You may obtain a copy of the NPL at
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* http://www.mozilla.org/NPL/
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*
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* Software distributed under the NPL is distributed on an "AS IS" basis,
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* WITHOUT WARRANTY OF ANY KIND, either express or implied. See the NPL
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* for the specific language governing rights and limitations under the
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* NPL.
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*
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* The Initial Developer of this code under the NPL is Netscape
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* Communications Corporation. Portions created by Netscape are
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* Copyright (C) 1998 Netscape Communications Corporation. All Rights
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* Reserved.
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*/
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#ifndef nsIAllocator_h___
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#define nsIAllocator_h___
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#include "nsISupports.h"
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/**
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* Unlike IMalloc, this interface returns nsresults and doesn't
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* implement the problematic GetSize and DidAlloc routines.
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*/
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#define NS_IALLOCATOR_IID \
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{ /* 56def700-b1b9-11d2-8177-006008119d7a */ \
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0x56def700, \
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0xb1b9, \
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0x11d2, \
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{0x81, 0x77, 0x00, 0x60, 0x08, 0x11, 0x9d, 0x7a} \
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}
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#define NS_ALLOCATOR_PROGID "component://netscape/allocator"
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#define NS_ALLOCATOR_CLASSNAME "Allocator"
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class nsIAllocator : public nsISupports {
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public:
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static const nsIID& GetIID() { static nsIID iid = NS_IALLOCATOR_IID; return iid; }
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/**
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* Allocates a block of memory of a particular size.
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*
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* @param size - the size of the block to allocate
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* @result the block of memory
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*/
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NS_IMETHOD_(void*) Alloc(PRUint32 size) = 0;
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/**
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* Reallocates a block of memory to a new size.
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*
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* @param ptr - the block of memory to reallocate
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* @param size - the new size
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* @result the rellocated block of memory
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*/
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NS_IMETHOD_(void*) Realloc(void* ptr, PRUint32 size) = 0;
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/**
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* Frees a block of memory.
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*
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* @param ptr - the block of memory to free
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* @param size - the size of the block to be freed. If -1 (the default),
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* the implementation must be able to determine the block size by
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* examining the block pointer.
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*/
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NS_IMETHOD Free(void* ptr) = 0;
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/**
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* Attempts to shrink the heap.
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*/
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NS_IMETHOD HeapMinimize(void) = 0;
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};
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// To get the global memory manager service:
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#define NS_ALLOCATOR_CID \
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{ /* aafe6770-b1bb-11d2-8177-006008119d7a */ \
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0xaafe6770, \
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0xb1bb, \
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0x11d2, \
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{0x81, 0x77, 0x00, 0x60, 0x08, 0x11, 0x9d, 0x7a} \
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}
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/*
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* Public shortcuts to the shared allocator's methods
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*/
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class nsAllocator
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{
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public:
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static NS_EXPORT void* Alloc(PRUint32 size);
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static NS_EXPORT void* Realloc(void* ptr, PRUint32 size);
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static NS_EXPORT void Free(void* ptr);
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static NS_EXPORT void HeapMinimize();
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static NS_EXPORT void* Clone(const void* ptr, PRUint32 size);
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private:
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nsAllocator(); // not implemented
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static PRBool EnsureAllocator() {return mAllocator || FetchAllocator();}
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static PRBool FetchAllocator();
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static nsIAllocator* mAllocator;
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};
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////////////////////////////////////////////////////////////////////////////////
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#endif /* nsIAllocator_h___ */
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