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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include "chrome/browser/power_save_blocker.h"
#include "chrome/browser/chrome_thread.h"
// Accessed only from the UI thread.
int PowerSaveBlocker::blocker_count_ = 0;
PowerSaveBlocker::PowerSaveBlocker(bool enable) : enabled_(false) {
if (enable)
Enable();
}
PowerSaveBlocker::~PowerSaveBlocker(void) {
Disable();
}
void PowerSaveBlocker::Enable() {
if (enabled_)
return;
enabled_ = true;
PostAdjustBlockCount(1);
}
void PowerSaveBlocker::Disable() {
if (!enabled_)
return;
enabled_ = false;
PostAdjustBlockCount(-1);
}
void PowerSaveBlocker::PostAdjustBlockCount(int delta) {
ChromeThread::PostTask(
ChromeThread::UI, FROM_HERE,
NewRunnableFunction(&PowerSaveBlocker::AdjustBlockCount, delta));
}
// Called only from UI thread.
void PowerSaveBlocker::AdjustBlockCount(int delta) {
DCHECK(ChromeThread::CurrentlyOn(ChromeThread::UI));
bool was_blocking = (blocker_count_ != 0);
blocker_count_ += delta;
bool is_blocking = (blocker_count_ != 0);
DCHECK_GE(blocker_count_, 0);
if (is_blocking != was_blocking)
ApplyBlock(is_blocking);
}
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