зеркало из https://github.com/mozilla/gecko-dev.git
50 строки
1.6 KiB
C++
50 строки
1.6 KiB
C++
/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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/* vim: set ts=8 sts=2 et sw=2 tw=80: */
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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 "nsMemoryPressure.h"
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#include "mozilla/Assertions.h"
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#include "mozilla/Atomics.h"
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#include "nsThreadUtils.h"
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using namespace mozilla;
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static Atomic<int32_t, Relaxed> sMemoryPressurePending;
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static_assert(MemPressure_None == 0,
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"Bad static initialization with the default constructor.");
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MemoryPressureState NS_GetPendingMemoryPressure() {
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int32_t value = sMemoryPressurePending.exchange(MemPressure_None);
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return MemoryPressureState(value);
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}
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void NS_DispatchEventualMemoryPressure(MemoryPressureState aState) {
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/*
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* A new memory pressure event erases an ongoing (or stop of) memory pressure,
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* but an existing "new" memory pressure event takes precedence over a new
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* "ongoing" or "stop" memory pressure event.
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*/
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switch (aState) {
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case MemPressure_None:
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sMemoryPressurePending = MemPressure_None;
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break;
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case MemPressure_New:
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sMemoryPressurePending = MemPressure_New;
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break;
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case MemPressure_Ongoing:
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case MemPressure_Stopping:
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sMemoryPressurePending.compareExchange(MemPressure_None, aState);
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break;
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}
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}
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nsresult NS_DispatchMemoryPressure(MemoryPressureState aState) {
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NS_DispatchEventualMemoryPressure(aState);
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nsCOMPtr<nsIRunnable> event =
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new Runnable("NS_DispatchEventualMemoryPressure");
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return NS_DispatchToMainThread(event);
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}
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