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
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
|
// 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_impl.h"
#include <windows.h>
#include "base/logging.h"
#include "base/strings/utf_string_conversions.h"
#include "base/win/scoped_handle.h"
#include "base/win/windows_version.h"
#include "content/public/browser/browser_thread.h"
namespace content {
namespace {
int g_blocker_count[2];
HANDLE CreatePowerRequest(POWER_REQUEST_TYPE type, const std::string& reason) {
typedef HANDLE (WINAPI* PowerCreateRequestPtr)(PREASON_CONTEXT);
typedef BOOL (WINAPI* PowerSetRequestPtr)(HANDLE, POWER_REQUEST_TYPE);
if (type == PowerRequestExecutionRequired &&
base::win::GetVersion() < base::win::VERSION_WIN8) {
return INVALID_HANDLE_VALUE;
}
static PowerCreateRequestPtr PowerCreateRequestFn = NULL;
static PowerSetRequestPtr PowerSetRequestFn = NULL;
if (!PowerCreateRequestFn || !PowerSetRequestFn) {
HMODULE module = GetModuleHandle(L"kernel32.dll");
PowerCreateRequestFn = reinterpret_cast<PowerCreateRequestPtr>(
GetProcAddress(module, "PowerCreateRequest"));
PowerSetRequestFn = reinterpret_cast<PowerSetRequestPtr>(
GetProcAddress(module, "PowerSetRequest"));
if (!PowerCreateRequestFn || !PowerSetRequestFn)
return INVALID_HANDLE_VALUE;
}
string16 wide_reason = ASCIIToUTF16(reason);
REASON_CONTEXT context = {0};
context.Version = POWER_REQUEST_CONTEXT_VERSION;
context.Flags = POWER_REQUEST_CONTEXT_SIMPLE_STRING;
context.Reason.SimpleReasonString = const_cast<wchar_t*>(wide_reason.c_str());
base::win::ScopedHandle handle(PowerCreateRequestFn(&context));
if (!handle.IsValid())
return INVALID_HANDLE_VALUE;
if (PowerSetRequestFn(handle, type))
return handle.Take();
// Something went wrong.
return INVALID_HANDLE_VALUE;
}
// Takes ownership of the |handle|.
void DeletePowerRequest(POWER_REQUEST_TYPE type, HANDLE handle) {
base::win::ScopedHandle request_handle(handle);
if (!request_handle.IsValid())
return;
if (type == PowerRequestExecutionRequired &&
base::win::GetVersion() < base::win::VERSION_WIN8) {
return;
}
typedef BOOL (WINAPI* PowerClearRequestPtr)(HANDLE, POWER_REQUEST_TYPE);
HMODULE module = GetModuleHandle(L"kernel32.dll");
PowerClearRequestPtr PowerClearRequestFn =
reinterpret_cast<PowerClearRequestPtr>(
GetProcAddress(module, "PowerClearRequest"));
if (!PowerClearRequestFn)
return;
BOOL success = PowerClearRequestFn(request_handle, type);
DCHECK(success);
}
void ApplySimpleBlock(PowerSaveBlocker::PowerSaveBlockerType type,
int delta) {
g_blocker_count[type] += delta;
DCHECK_GE(g_blocker_count[type], 0);
if (g_blocker_count[type] > 1)
return;
DWORD this_flag = 0;
if (type == PowerSaveBlocker::kPowerSaveBlockPreventAppSuspension)
this_flag |= ES_SYSTEM_REQUIRED;
else
this_flag |= ES_DISPLAY_REQUIRED;
DCHECK(this_flag);
static DWORD flags = ES_CONTINUOUS;
if (!g_blocker_count[type])
flags &= ~this_flag;
else
flags |= this_flag;
SetThreadExecutionState(flags);
}
} // namespace
class PowerSaveBlockerImpl::Delegate
: public base::RefCountedThreadSafe<PowerSaveBlockerImpl::Delegate> {
public:
Delegate(PowerSaveBlockerType type, const std::string& reason)
: type_(type), reason_(reason) {}
// Does the actual work to apply or remove the desired power save block.
void ApplyBlock();
void RemoveBlock();
// Returns the equivalent POWER_REQUEST_TYPE for this request.
POWER_REQUEST_TYPE RequestType();
private:
friend class base::RefCountedThreadSafe<Delegate>;
~Delegate() {}
PowerSaveBlockerType type_;
const std::string reason_;
base::win::ScopedHandle handle_;
DISALLOW_COPY_AND_ASSIGN(Delegate);
};
void PowerSaveBlockerImpl::Delegate::ApplyBlock() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (base::win::GetVersion() < base::win::VERSION_WIN7)
return ApplySimpleBlock(type_, 1);
handle_.Set(CreatePowerRequest(RequestType(), reason_));
}
void PowerSaveBlockerImpl::Delegate::RemoveBlock() {
DCHECK(BrowserThread::CurrentlyOn(BrowserThread::UI));
if (base::win::GetVersion() < base::win::VERSION_WIN7)
return ApplySimpleBlock(type_, -1);
DeletePowerRequest(RequestType(), handle_.Take());
}
POWER_REQUEST_TYPE PowerSaveBlockerImpl::Delegate::RequestType() {
if (type_ == kPowerSaveBlockPreventDisplaySleep)
return PowerRequestDisplayRequired;
if (base::win::GetVersion() < base::win::VERSION_WIN8)
return PowerRequestSystemRequired;
return PowerRequestExecutionRequired;
}
PowerSaveBlockerImpl::PowerSaveBlockerImpl(PowerSaveBlockerType type,
const std::string& reason)
: delegate_(new Delegate(type, reason)) {
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&Delegate::ApplyBlock, delegate_));
}
PowerSaveBlockerImpl::~PowerSaveBlockerImpl() {
BrowserThread::PostTask(
BrowserThread::UI, FROM_HERE,
base::Bind(&Delegate::RemoveBlock, delegate_));
}
} // namespace content
|
