blob: da48052a332fc30e29a83d95784755a739774584 (
plain)
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
|
// 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 "chrome/browser/power_save_blocker.h"
#include <IOKit/pwr_mgt/IOPMLib.h>
#include "base/threading/platform_thread.h"
#include "base/threading/thread.h"
#include "content/browser/browser_thread.h"
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() {
DCHECK_EQ(base::PlatformThread::CurrentId(), g_power_thread->thread_id());
IOReturn result;
DCHECK_EQ(g_power_assertion, kIOPMNullAssertionID);
// Block just idle sleep; allow display sleep.
// See QA1340 <http://developer.apple.com/library/mac/#qa/qa2004/qa1340.html>
// for more details.
result = IOPMAssertionCreate(kIOPMAssertionTypeNoIdleSleep,
kIOPMAssertionLevelOn,
&g_power_assertion);
LOG_IF(ERROR, result != kIOReturnSuccess)
<< "IOPMAssertionCreate: " << result;
}
void ReleaseSleepAssertion() {
DCHECK_EQ(base::PlatformThread::CurrentId(), g_power_thread->thread_id());
IOReturn result;
DCHECK_NE(g_power_assertion, kIOPMNullAssertionID);
result = IOPMAssertionRelease(g_power_assertion);
g_power_assertion = kIOPMNullAssertionID;
LOG_IF(ERROR, result != kIOReturnSuccess)
<< "IOPMAssertionRelease: " << result;
}
} // namespace
// Called only from UI thread.
void PowerSaveBlocker::ApplyBlock(bool blocking) {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (!g_power_thread) {
g_power_assertion = kIOPMNullAssertionID;
g_power_thread = new base::Thread("PowerSaveBlocker");
g_power_thread->Start();
}
MessageLoop* loop = g_power_thread->message_loop();
if (blocking)
loop->PostTask(FROM_HERE, NewRunnableFunction(CreateSleepAssertion));
else
loop->PostTask(FROM_HERE, NewRunnableFunction(ReleaseSleepAssertion));
}
|
