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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_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;
}
base::string16 wide_reason = base::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.Get(), 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.Get(), 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
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