mirror of
https://github.com/mozilla/gecko-dev.git
synced 2024-10-19 00:05:36 +00:00
265e672179
# ignore-this-changeset --HG-- extra : amend_source : 4d301d3b0b8711c4692392aa76088ba7fd7d1022
50 lines
1.6 KiB
C++
50 lines
1.6 KiB
C++
/* -*- 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/. */
|
|
|
|
#include "nsMemoryPressure.h"
|
|
#include "mozilla/Assertions.h"
|
|
#include "mozilla/Atomics.h"
|
|
|
|
#include "nsThreadUtils.h"
|
|
|
|
using namespace mozilla;
|
|
|
|
static Atomic<int32_t, Relaxed> sMemoryPressurePending;
|
|
static_assert(MemPressure_None == 0,
|
|
"Bad static initialization with the default constructor.");
|
|
|
|
MemoryPressureState NS_GetPendingMemoryPressure() {
|
|
int32_t value = sMemoryPressurePending.exchange(MemPressure_None);
|
|
return MemoryPressureState(value);
|
|
}
|
|
|
|
void NS_DispatchEventualMemoryPressure(MemoryPressureState aState) {
|
|
/*
|
|
* A new memory pressure event erases an ongoing (or stop of) memory pressure,
|
|
* but an existing "new" memory pressure event takes precedence over a new
|
|
* "ongoing" or "stop" memory pressure event.
|
|
*/
|
|
switch (aState) {
|
|
case MemPressure_None:
|
|
sMemoryPressurePending = MemPressure_None;
|
|
break;
|
|
case MemPressure_New:
|
|
sMemoryPressurePending = MemPressure_New;
|
|
break;
|
|
case MemPressure_Ongoing:
|
|
case MemPressure_Stopping:
|
|
sMemoryPressurePending.compareExchange(MemPressure_None, aState);
|
|
break;
|
|
}
|
|
}
|
|
|
|
nsresult NS_DispatchMemoryPressure(MemoryPressureState aState) {
|
|
NS_DispatchEventualMemoryPressure(aState);
|
|
nsCOMPtr<nsIRunnable> event =
|
|
new Runnable("NS_DispatchEventualMemoryPressure");
|
|
return NS_DispatchToMainThread(event);
|
|
}
|