forked from mirrors/gecko-dev
ee072f14eb
This is the main part to address bug 1701368.
Before this patch, `nsAvailableMemoryWatcher` directly broadcasted a memory-pressure
event when we enter into a low-memory situation and `TabUnloader` unloaded a tab in
response to the memory-pressure message. We want to decouple `TabUnloader` from
memory-pressure listeners because unloading a tab may solve a low-memory situation
alone.
With this patch, if `nsAvailableMemoryWatcher` detects a low-memory situation,
it invokes `TabUnloader` synchronously via an XPCOM interface. If `TabUnloader`
unloads a tab, we don't do any further action. If there is no discardable tab,
`TabUnloader` notifies back `nsAvailableMemoryWatcher` via another XPCOM interface,
so that `nsAvailableMemoryWatcher` can notify of a memory-pressure event.
Differential Revision: https://phabricator.services.mozilla.com/D117673
28 lines
989 B
Text
28 lines
989 B
Text
/* -*- Mode: C++; tab-width: 4; indent-tabs-mode: nil; c-basic-offset: 4 -*- */
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/* This Source Code Form is subject to the terms of the Mozilla Public
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* License, v. 2.0. If a copy of the MPL was not distributed with this
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* file, You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "nsISupports.idl"
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/**
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* nsITabUnloader: interface to represent TabUnloader
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*
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* nsIAvailableMemoryWatcherBase: interface to watch the system's memory
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* status and invoke a registered TabUnloader when it detected a low-memory
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* and high-memory situation. The logic to detect such a memory situation
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* is defined per platform.
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*/
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[scriptable, uuid(2e530956-6054-464f-9f4c-0ae6f8de5523)]
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interface nsITabUnloader : nsISupports
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{
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void unloadTabAsync();
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};
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[scriptable, uuid(b0b5701e-239d-49db-9009-37e89f86441c)]
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interface nsIAvailableMemoryWatcherBase : nsISupports
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{
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void registerTabUnloader(in nsITabUnloader aTabUnloader);
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void onUnloadAttemptCompleted(in nsresult aResult);
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};
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