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// Copyright (c) 2011 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 "content/browser/power_save_blocker.h"
#include <IOKit/pwr_mgt/IOPMLib.h>
#include "base/bind.h"
#include "base/threading/platform_thread.h"
#include "base/threading/thread.h"
#include "content/public/browser/browser_thread.h"
using content::BrowserThread;
namespace {
// Power management cannot be done on the UI thread. IOPMAssertionCreate does a
// synchronous MIG call to configd, so if it is called on the main thread the UI
// is at the mercy of another process. See http://crbug.com/79559 and
// http://www.opensource.apple.com/source/IOKitUser/IOKitUser-514.16.31/pwr_mgt.subproj/IOPMLibPrivate.c .
base::Thread* g_power_thread;
IOPMAssertionID g_power_assertion;
void CreateSleepAssertion(PowerSaveBlocker::PowerSaveBlockerType type) {
DCHECK_EQ(base::PlatformThread::CurrentId(), g_power_thread->thread_id());
IOReturn result;
if (g_power_assertion != kIOPMNullAssertionID) {
result = IOPMAssertionRelease(g_power_assertion);
g_power_assertion = kIOPMNullAssertionID;
LOG_IF(ERROR, result != kIOReturnSuccess)
<< "IOPMAssertionRelease: " << result;
}
CFStringRef level = NULL;
// See QA1340 <http://developer.apple.com/library/mac/#qa/qa1340/> for more
// details.
switch (type) {
case PowerSaveBlocker::kPowerSaveBlockPreventSystemSleep:
level = kIOPMAssertionTypeNoIdleSleep;
break;
case PowerSaveBlocker::kPowerSaveBlockPreventDisplaySleep:
level = kIOPMAssertionTypeNoDisplaySleep;
break;
default:
break;
}
if (level) {
result = IOPMAssertionCreate(level,
kIOPMAssertionLevelOn,
&g_power_assertion);
LOG_IF(ERROR, result != kIOReturnSuccess)
<< "IOPMAssertionCreate: " << result;
}
}
} // namespace
// Called only from UI thread.
// static
void PowerSaveBlocker::ApplyBlock(PowerSaveBlockerType type) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (!g_power_thread) {
g_power_assertion = kIOPMNullAssertionID;
g_power_thread = new base::Thread("PowerSaveBlocker");
g_power_thread->Start();
}
g_power_thread->message_loop()->
PostTask(FROM_HERE, base::Bind(CreateSleepAssertion, type));
}
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