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// Copyright (c) 2012 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/lazy_instance.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));
}
// TODO(avi): Remove ^^^ this code in favor of vvv this code.
// http://crbug.com/126591
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 .
struct PowerSaveBlockerLazyInstanceTraits {
static const bool kRegisterOnExit = false;
static const bool kAllowedToAccessOnNonjoinableThread = true;
static base::Thread* New(void* instance) {
base::Thread* thread = new (instance) base::Thread("PowerSaveBlocker");
thread->Start();
return thread;
}
static void Delete(base::Thread* instance) { }
};
base::LazyInstance<base::Thread, PowerSaveBlockerLazyInstanceTraits>
g_power_thread2 = LAZY_INSTANCE_INITIALIZER;
} // namespace
namespace content {
class PowerSaveBlocker2::Delegate
: public base::RefCountedThreadSafe<PowerSaveBlocker2::Delegate> {
public:
Delegate(PowerSaveBlockerType type, const std::string& reason)
: type_(type), reason_(reason), assertion_(kIOPMNullAssertionID) {}
// Does the actual work to apply or remove the desired power save block.
void ApplyBlock();
void RemoveBlock();
private:
friend class base::RefCountedThreadSafe<PowerSaveBlocker2::Delegate>;
~Delegate() {}
PowerSaveBlockerType type_;
std::string reason_;
IOPMAssertionID assertion_;
};
void PowerSaveBlocker2::Delegate::ApplyBlock() {
DCHECK_EQ(base::PlatformThread::CurrentId(),
g_power_thread2.Pointer()->thread_id());
CFStringRef level = NULL;
// See QA1340 <http://developer.apple.com/library/mac/#qa/qa1340/> for more
// details.
switch (type_) {
case PowerSaveBlocker2::kPowerSaveBlockPreventAppSuspension:
level = kIOPMAssertionTypeNoIdleSleep;
break;
case PowerSaveBlocker2::kPowerSaveBlockPreventDisplaySleep:
level = kIOPMAssertionTypeNoDisplaySleep;
break;
default:
NOTREACHED();
break;
}
if (level) {
// TODO(avi): Switch to IOPMAssertionCreateWithName when 10.6 is the minimum
// system supported by Chromium.
IOReturn result = IOPMAssertionCreate(level,
kIOPMAssertionLevelOn,
&assertion_);
LOG_IF(ERROR, result != kIOReturnSuccess)
<< "IOPMAssertionCreate: " << result;
}
}
void PowerSaveBlocker2::Delegate::RemoveBlock() {
DCHECK_EQ(base::PlatformThread::CurrentId(),
g_power_thread2.Pointer()->thread_id());
if (assertion_ != kIOPMNullAssertionID) {
IOReturn result = IOPMAssertionRelease(assertion_);
LOG_IF(ERROR, result != kIOReturnSuccess)
<< "IOPMAssertionRelease: " << result;
}
}
PowerSaveBlocker2::PowerSaveBlocker2(PowerSaveBlockerType type,
const std::string& reason)
: delegate_(new PowerSaveBlocker2::Delegate(type, reason)) {
g_power_thread2.Pointer()->message_loop()->PostTask(
FROM_HERE,
base::Bind(&PowerSaveBlocker2::Delegate::ApplyBlock, delegate_));
}
PowerSaveBlocker2::~PowerSaveBlocker2() {
g_power_thread2.Pointer()->message_loop()->PostTask(
FROM_HERE,
base::Bind(&PowerSaveBlocker2::Delegate::RemoveBlock, delegate_));
}
} // namespace content
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