mirror of
https://github.com/mozilla/gecko-dev.git
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160 lines
3.5 KiB
C++
160 lines
3.5 KiB
C++
/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
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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 file,
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* You can obtain one at http://mozilla.org/MPL/2.0/. */
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#include "mozilla/Hal.h"
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#include "mozilla/HalWakeLock.h"
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#include "mozilla/Services.h"
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#include "nsObserverService.h"
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#include "nsDataHashtable.h"
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#include "nsHashKeys.h"
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using namespace mozilla::hal;
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namespace mozilla {
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namespace hal {
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WakeLockState
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ComputeWakeLockState(int aNumLocks, int aNumHidden)
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{
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if (aNumLocks == 0) {
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return WAKE_LOCK_STATE_UNLOCKED;
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} else if (aNumLocks == aNumHidden) {
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return WAKE_LOCK_STATE_HIDDEN;
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} else {
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return WAKE_LOCK_STATE_VISIBLE;
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}
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}
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} // hal
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} // mozilla
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namespace mozilla {
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namespace hal_impl {
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namespace {
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struct LockCount {
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PRUint32 numLocks;
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PRUint32 numHidden;
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};
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}
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static int sActiveChildren = 0;
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static nsAutoPtr<nsDataHashtable<nsStringHashKey, LockCount> > sLockTable;
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static bool sInitialized = false;
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static bool sIsShuttingDown = false;
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namespace {
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class ClearHashtableOnShutdown MOZ_FINAL : public nsIObserver {
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public:
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NS_DECL_ISUPPORTS
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NS_DECL_NSIOBSERVER
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};
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NS_IMPL_ISUPPORTS1(ClearHashtableOnShutdown, nsIObserver)
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NS_IMETHODIMP
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ClearHashtableOnShutdown::Observe(nsISupports* aSubject, const char* aTopic, const PRUnichar* data)
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{
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MOZ_ASSERT(!strcmp(aTopic, "xpcom-shutdown"));
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sIsShuttingDown = true;
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sLockTable = nsnull;
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return NS_OK;
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}
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} // anonymous namespace
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static void
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Init()
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{
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sLockTable = new nsDataHashtable<nsStringHashKey, LockCount>();
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sLockTable->Init();
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sInitialized = true;
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nsCOMPtr<nsIObserverService> obs = mozilla::services::GetObserverService();
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if (obs) {
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obs->AddObserver(new ClearHashtableOnShutdown(), "xpcom-shutdown", false);
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}
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}
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void
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EnableWakeLockNotifications()
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{
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sActiveChildren++;
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}
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void
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DisableWakeLockNotifications()
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{
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sActiveChildren--;
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}
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void
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ModifyWakeLock(const nsAString &aTopic,
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hal::WakeLockControl aLockAdjust,
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hal::WakeLockControl aHiddenAdjust)
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{
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if (sIsShuttingDown) {
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return;
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}
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if (!sInitialized) {
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Init();
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}
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LockCount count;
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count.numLocks = 0;
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count.numHidden = 0;
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sLockTable->Get(aTopic, &count);
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MOZ_ASSERT(count.numLocks >= count.numHidden);
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MOZ_ASSERT(aLockAdjust >= 0 || count.numLocks > 0);
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MOZ_ASSERT(aHiddenAdjust >= 0 || count.numHidden > 0);
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WakeLockState oldState = ComputeWakeLockState(count.numLocks, count.numHidden);
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count.numLocks += aLockAdjust;
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count.numHidden += aHiddenAdjust;
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MOZ_ASSERT(count.numLocks >= count.numHidden);
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if (count.numLocks) {
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sLockTable->Put(aTopic, count);
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} else {
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sLockTable->Remove(aTopic);
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}
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WakeLockState newState = ComputeWakeLockState(count.numLocks, count.numHidden);
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if (sActiveChildren && oldState != newState) {
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WakeLockInformation info;
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info.numLocks() = count.numLocks;
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info.numHidden() = count.numHidden;
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info.topic() = aTopic;
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NotifyWakeLockChange(info);
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}
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}
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void
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GetWakeLockInfo(const nsAString &aTopic, WakeLockInformation *aWakeLockInfo)
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{
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if (sIsShuttingDown) {
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NS_WARNING("You don't want to get wake lock information during xpcom-shutdown!");
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return;
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}
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if (!sInitialized) {
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Init();
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}
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LockCount count;
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count.numLocks = 0;
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count.numHidden = 0;
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sLockTable->Get(aTopic, &count);
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aWakeLockInfo->numLocks() = count.numLocks;
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aWakeLockInfo->numHidden() = count.numHidden;
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aWakeLockInfo->topic() = aTopic;
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}
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} // hal_impl
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} // mozilla
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