os: implement win10 high-resolution timer as replacement for Sleep() / sleep_for() (#682)

## Link to GitHub Issue or related Pull Request, if one exists
Fixes #681 

## Description of change
`Sleep` and `sleep_for()` can be very inaccurate and varies depending on
what the OS gives us...

### `timeBeginPeriod(1)`
On boot, we are now calling `timeBeginPeriod(1)`, which affects the
whole process but makes `Sleep` more accurate. There is some risk here
if any game was relying on doing things like `Sleep(1)` and expecting it
to run for 15.6ms. Most games already call `timeBeginPeriod(1)` in the
game engine, though not the whole time, so I'm hoping that this is not
too impactful.

### Opt out of Win11 power throttling
Ensure that timer resolution change above is respected even when the
window is occluded / minimized by opting out of throttling via
`PROCESS_POWER_THROTTLING_IGNORE_TIMER_RESOLUTION`.

### Use Win10 high resolution timer instead of Sleep

On Win10 1803 and above, there is a new OS-level API for high resolution
timers; if this is available, use it
(`CREATE_WAITABLE_TIMER_HIGH_RESOLUTION`). Worth noting that WINE
doesn't support this currently.

If not, fall back to `Sleep`, which is significantly better than
`sleep_for()` in my experiments.

Callers of Sleep / sleep_for were replaced with this new timer. Most of
them anyway; calls to Sleep() with more than 100ms+ was left alone.

### Add an option as a chicken bit

To opt out I'm adding a new option called `Use Legacy Timers` which will
revert to behavior before this PR. The code paths that switched from
`sleep_for` to `Sleep` will remain in place though, not affected by the
option.

## Expected changes
In some I/O emulation modules, poll threads may run more frequently,
resulting in lower latency.

It also means that spice overall may use more CPU resources and power.
If you don't like this, you can always enable the option to opt out;
e.g., if you're on old arcade cab PC.

## Testing

DDR p4io - ok
drs touch hook - ok
IIDX camera hook - ok
CCJ trackball - ok
This commit is contained in:
bicarus
2026-05-08 02:25:20 -07:00
committed by GitHub
parent 1957917270
commit 71ba9b6b47
25 changed files with 320 additions and 34 deletions
+3 -1
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@@ -6,6 +6,7 @@
#include "util/logging.h"
#include "rawinput/rawinput.h"
#include "games/io.h"
#include "util/precise_timer.h"
#include "util/utils.h"
#include "io.h"
@@ -243,6 +244,7 @@ namespace games::ccj {
log_info("trackball", "thread start, use mouse: {}, toggle: {}", MOUSE_TRACKBALL, MOUSE_TRACKBALL_USE_TOGGLE);
tbThread = new std::thread([&] {
timeutils::PreciseSleepTimer timer;
while (tbThreadRunning) {
if (hWnd && wndProc) {
wndProc(hWnd, WM_INPUT, RIM_INPUT, (LPARAM)fakeHandle);
@@ -251,7 +253,7 @@ namespace games::ccj {
if (!tbThreadRunning)
break;
std::this_thread::sleep_for(10ms);
timer.sleep(10);
}
});
}
+3 -1
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@@ -3,6 +3,7 @@
#include "cfg/api.h"
#include "rawinput/rawinput.h"
#include "util/logging.h"
#include "util/precise_timer.h"
#include "util/utils.h"
#include "../ddr.h"
@@ -459,7 +460,8 @@ int games::ddr::DDRP3IOHandle::device_io(
if (nOutBufferSize >= 4) {
// cool down
Sleep(1);
static thread_local timeutils::PreciseSleepTimer timer;
timer.sleep(1);
// get controls as single variable (4 bytes)
auto &controls = *(uint32_t*) lpOutBuffer;
+3 -1
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@@ -2,6 +2,7 @@
#include "rawinput/rawinput.h"
#include "util/logging.h"
#include "util/precise_timer.h"
#include "util/utils.h"
#include "../io.h"
@@ -255,7 +256,8 @@ namespace games::ddr {
case P4IO_IOCTL_GET_INPUTS: {
// Prevents this function from being called at its normal 2000-2500 kHz cadence and overloading the CPU, instead reduces it to 250 Hz
Sleep(4);
static thread_local timeutils::PreciseSleepTimer timer;
timer.sleep(4);
memset(lpOutBuffer, 0, 16);
auto controls = (uint32_t*) lpOutBuffer;
+3 -1
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@@ -7,6 +7,7 @@
#include "games/game.h"
#include "util/detour.h"
#include "util/logging.h"
#include "util/precise_timer.h"
#include "util/memutils.h"
#include "rgb_cam.h"
@@ -221,10 +222,11 @@ namespace games::drs {
void start_touch() {
std::thread t([] {
log_info("drs", "starting touch input thread");
timeutils::PreciseSleepTimer timer;
// main loop
while (TRUE) {
std::this_thread::sleep_for(std::chrono::milliseconds(1));
timer.sleep(1);
TOUCH_EVENTS.clear();
touch_get_events(TOUCH_EVENTS);
+3 -1
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@@ -2,6 +2,7 @@
#include "misc/eamuse.h"
#include "rawinput/rawinput.h"
#include "util/precise_timer.h"
#include "util/utils.h"
#include "iidx.h"
@@ -82,7 +83,8 @@ bool games::iidx::IIDXFMSerialHandle::FMSerialDevice::parse_msg(
}
// sleep - otherwise the IO thread will go too hard on the CPU
Sleep(1);
static thread_local timeutils::PreciseSleepTimer timer;
timer.sleep(1);
// generate message
auto msg = this->create_msg(msg_in, 0x2E);
+3 -1
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@@ -2,6 +2,7 @@
#include "misc/eamuse.h"
#include "rawinput/rawinput.h"
#include "util/precise_timer.h"
#include "util/utils.h"
#include "iidx.h"
@@ -82,7 +83,8 @@ bool games::iidx::BI2XSerialHandle::BI2XDevice::parse_msg(
}
// sleep - otherwise the IO thread will go too hard on the CPU
Sleep(1);
static thread_local timeutils::PreciseSleepTimer timer;
timer.sleep(1);
// generate message
auto msg = this->create_msg(msg_in, 0x2E);
+3 -1
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@@ -3,6 +3,7 @@
#if SPICE64 && !SPICE_XP
#include "util/logging.h"
#include "util/precise_timer.h"
#include "util/utils.h"
#include "mf_wrappers.h"
@@ -399,6 +400,7 @@ namespace games::iidx {
void IIDXLocalCamera::CreateThread() {
// Create thread
m_drawThread = new std::thread([this]() {
timeutils::PreciseSleepTimer timer;
SetThreadPriority(GetCurrentThread(), THREAD_PRIORITY_BELOW_NORMAL);
double accumulator = 0.0;
@@ -412,7 +414,7 @@ namespace games::iidx {
accumulator -= 1.0;
floorFrameTimeMicroSec += 1;
}
std::this_thread::sleep_for(std::chrono::microseconds(floorFrameTimeMicroSec));
timer.sleep(std::chrono::microseconds(floorFrameTimeMicroSec));
}
});
}
+3 -1
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@@ -15,6 +15,7 @@
#include "touch/touch.h"
#include "util/libutils.h"
#include "util/logging.h"
#include "util/precise_timer.h"
#define POKE_NATIVE_TOUCH 0
@@ -200,6 +201,7 @@ namespace games::iidx::poke {
// create new thread
THREAD_RUNNING = true;
THREAD = new std::thread([] {
timeutils::PreciseSleepTimer timer;
// log
log_info("poke", "enabled");
@@ -319,7 +321,7 @@ namespace games::iidx::poke {
}
// slow down
Sleep(50);
timer.sleep(50);
}
return nullptr;
+3 -1
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@@ -9,6 +9,7 @@
#include "misc/eamuse.h"
#include "touch/touch.h"
#include "util/logging.h"
#include "util/precise_timer.h"
namespace games::nost::poke {
@@ -63,6 +64,7 @@ namespace games::nost::poke {
// create new thread
THREAD_RUNNING = true;
THREAD = new std::thread([] {
timeutils::PreciseSleepTimer timer;
const DWORD touch_id = (DWORD)(0xFFFFFFFE);
const int swipe_anim_total_frames = 6;
@@ -178,7 +180,7 @@ namespace games::nost::poke {
}
// slow down
Sleep(30);
timer.sleep(30);
}
return nullptr;
+6 -2
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@@ -4,6 +4,7 @@
#include "touchpanel.h"
#include "util/logging.h"
#include "util/precise_timer.h"
#include "touch/touch.h"
using namespace std::chrono_literals;
@@ -44,6 +45,9 @@ bool games::onpara::TouchPanelHandle::open(LPCWSTR lpFileName) {
}
int games::onpara::TouchPanelHandle::read(LPVOID lpBuffer, DWORD nNumberOfBytesToRead) {
static thread_local timeutils::PreciseSleepTimer timer;
DWORD i;
auto buffer = reinterpret_cast<uint8_t *>(lpBuffer);
@@ -67,7 +71,7 @@ int games::onpara::TouchPanelHandle::read(LPVOID lpBuffer, DWORD nNumberOfBytesT
enqueue_packet(report);
// prevent cpu bullying
std::this_thread::sleep_for(1ms);
timer.sleep(1);
}
// copy from output queue
@@ -133,4 +137,4 @@ bool games::onpara::TouchPanelHandle::close() {
log_info("touchpanel", "Closed COM1 (Touch Panel)");
return true;
}
}