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129 lines
5.0 KiB
Plaintext
129 lines
5.0 KiB
Plaintext
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/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* ***** BEGIN LICENSE BLOCK *****
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* Version: MPL 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 Mozilla Public License Version
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* 1.1 (the "License"); you may not use this file except in compliance with
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* the License. You may obtain a copy of the License at
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* http://www.mozilla.org/MPL/
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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 of the GNU General Public License Version 2 or later (the "GPL"),
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* or 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 MPL, 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 MPL, the GPL or the LGPL.
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*
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* ***** END LICENSE BLOCK ***** */
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#include "nsISupports.idl"
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/**
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*
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* nsIMemory: interface to allocate and deallocate memory. Also provides
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* for notifications in low-memory situations.
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*
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* The frozen exported symbols NS_Alloc, NS_Realloc, and NS_Free
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* provide a more efficient way to access XPCOM memory allocation. Using
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* those symbols is preferred to using the methods on this interface.
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*
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* A client that wishes to be notified of low memory situations (for
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* example, because the client maintains a large memory cache that
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* could be released when memory is tight) should register with the
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* observer service (see nsIObserverService) using the topic
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* "memory-pressure". There are three specific types of notications
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* that can occur. These types will be passed as the |aData|
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* parameter of the of the "memory-pressure" notification:
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*
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* "low-memory"
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* This will be passed as the extra data when the pressure
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* observer is being asked to flush for low-memory conditions.
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*
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* "heap-minimize"
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* This will be passed as the extra data when the pressure
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* observer is being asked to flush because of a heap minimize
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* call.
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*
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* "alloc-failure"
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* This will be passed as the extra data when the pressure
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* observer has been asked to flush because a malloc() or
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* realloc() has failed.
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*/
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[scriptable, uuid(59e7e77a-38e4-11d4-8cf5-0060b0fc14a3)]
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interface nsIMemory : nsISupports
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{
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/**
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* Allocates a block of memory of a particular size. If the memory
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* cannot be allocated (because of an out-of-memory condition), null
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* is returned.
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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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[noscript, notxpcom] voidPtr alloc(in size_t size);
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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 reallocated block of memory
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*
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* If ptr is null, this function behaves like malloc.
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* If s is the size of the block to which ptr points, the first
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* min(s, size) bytes of ptr's block are copied to the new block.
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* If the allocation succeeds, ptr is freed and a pointer to the
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* new block returned. If the allocation fails, ptr is not freed
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* and null is returned. The returned value may be the same as ptr.
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*/
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[noscript, notxpcom] voidPtr realloc(in voidPtr ptr,
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in size_t newSize);
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/**
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* Frees a block of memory. Null is a permissible value, in which case
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* nothing happens.
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*
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* @param ptr - the block of memory to free
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*/
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[noscript, notxpcom] void free(in voidPtr ptr);
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/**
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* Attempts to shrink the heap.
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* @param immediate - if true, heap minimization will occur
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* immediately if the call was made on the main thread. If
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* false, the flush will be scheduled to happen when the app is
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* idle.
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* @return NS_ERROR_FAILURE if 'immediate' is set an the call
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* was not on the application's main thread.
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*/
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void heapMinimize(in boolean immediate);
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/**
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* This predicate can be used to determine if we're in a low-memory
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* situation (what constitutes low-memory is platform dependent). This
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* can be used to trigger the memory pressure observers.
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*/
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boolean isLowMemory();
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};
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