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/* This Source Code Form is subject to the terms of the Mozilla Public
* License, v. 2.0. If a copy of the MPL was not distributed with this file,
#include "Hal.h"
#include "HalLog.h"
#include "nsWindowsHelpers.h" // for nsAutoHandle and nsModuleHandle
#include "mozilla/StaticPrefs_dom.h"
#include <windows.h>
using namespace mozilla::hal;
namespace mozilla {
namespace hal_impl {
void SetProcessPriority(int aPid, ProcessPriority aPriority) {
HAL_LOG("WindowsProcessPriority - SetProcessPriority(%d, %s)\n", aPid,
ProcessPriorityToString(aPriority));
nsAutoHandle processHandle(
::OpenProcess(PROCESS_SET_INFORMATION, FALSE, aPid));
if (processHandle) {
DWORD priority = NORMAL_PRIORITY_CLASS;
if (aPriority == PROCESS_PRIORITY_BACKGROUND) {
priority = IDLE_PRIORITY_CLASS;
} else if (aPriority == PROCESS_PRIORITY_BACKGROUND_PERCEIVABLE) {
priority = BELOW_NORMAL_PRIORITY_CLASS;
}
if (::SetPriorityClass(processHandle, priority)) {
HAL_LOG("WindowsProcessPriority - priority set to %d for pid %d\n",
aPriority, aPid);
}
// Set the process into or out of EcoQoS.
static bool alreadyInitialized = false;
static decltype(::SetProcessInformation)* setProcessInformation = nullptr;
if (!alreadyInitialized) {
if (aPriority == PROCESS_PRIORITY_PARENT_PROCESS ||
!StaticPrefs::dom_ipc_processPriorityManager_backgroundUsesEcoQoS()) {
return;
}
alreadyInitialized = true;
// SetProcessInformation only exists on Windows 8 and later.
nsModuleHandle module(LoadLibrary(L"Kernel32.dll"));
if (module) {
setProcessInformation =
(decltype(::SetProcessInformation)*)GetProcAddress(
module, "SetProcessInformation");
}
}
if (!setProcessInformation) {
return;
}
PROCESS_POWER_THROTTLING_STATE PowerThrottling;
RtlZeroMemory(&PowerThrottling, sizeof(PowerThrottling));
PowerThrottling.Version = PROCESS_POWER_THROTTLING_CURRENT_VERSION;
PowerThrottling.ControlMask = PROCESS_POWER_THROTTLING_EXECUTION_SPEED;
PowerThrottling.StateMask =
(aPriority == PROCESS_PRIORITY_BACKGROUND) &&
StaticPrefs::
dom_ipc_processPriorityManager_backgroundUsesEcoQoS()
? PROCESS_POWER_THROTTLING_EXECUTION_SPEED
: 0;
if (setProcessInformation(processHandle, ProcessPowerThrottling,
&PowerThrottling, sizeof(PowerThrottling))) {
HAL_LOG("SetProcessInformation(%d, %s)\n", aPid,
aPriority == PROCESS_PRIORITY_BACKGROUND ? "eco" : "normal");
} else {
HAL_LOG("SetProcessInformation failed for %d\n", aPid);
}
}
}
} // namespace hal_impl
} // namespace mozilla