/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */ /* vim: set ts=8 sts=2 et sw=2 tw=80: */ /* This Source Code Form is subject to the terms of the Mozilla Public * License, v. 2.0. If a copy of the MPL was not distributed with this
* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
#ifndef nsMemory_h__ #define nsMemory_h__
#include"nsError.h"
/** * * A client that wishes to be notified of low memory situations (for * example, because the client maintains a large memory cache that * could be released when memory is tight) should register with the * observer service (see nsIObserverService) using the topic * "memory-pressure". There are specific types of notifications * that can occur. These types will be passed as the |aData| * parameter of the of the "memory-pressure" notification: * * "low-memory" * This will be passed as the extra data when the pressure * observer is being asked to flush for low-memory conditions. * * "low-memory-ongoing" * This will be passed when we continue to be in a low-memory * condition and we want to flush caches and do other cheap * forms of memory minimization, but heavy handed approaches like * a GC are unlikely to succeed. * * "heap-minimize" * This will be passed as the extra data when the pressure * observer is being asked to flush because of a heap minimize * call.
*/
// This is implemented in nsMemoryImpl.cpp.
namespace nsMemory {
/** * Attempts to shrink the heap. * @param immediate - if true, heap minimization will occur * immediately if the call was made on the main thread. If * false, the flush will be scheduled to happen when the app is * idle. * @throws NS_ERROR_FAILURE if 'immediate' is set and the call * was not on the application's main thread.
*/
nsresult HeapMinimize(bool aImmediate);
/** * This predicate can be used to determine if the platform is a "low-memory" * platform. Callers may use this to dynamically tune their behaviour * to favour reduced memory usage at the expense of performance. The value * returned by this function will not change over the lifetime of the process.
*/ bool IsLowMemoryPlatform();
} // namespace nsMemory
#endif// nsMemory_h__
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