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[host] windows: add delayExecution function for more accurate sleeps

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This change not only exposes and allows use of NtDelayExecution, but
also moves the code to set the system timer resolution.
This commit is contained in:
Geoffrey McRae 2021-07-17 14:55:22 +10:00
parent e228165ff9
commit 411a6b1e49
6 changed files with 105 additions and 14 deletions
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1
host/platform/Windows/CMakeLists.txt
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@ -10,6 +10,7 @@ add_library(platform_Windows STATIC
src/service.c
src/mousehook.c
src/force_compose.c
src/delay.c
)
# allow use of functions for Windows Vista or later

16
host/platform/Windows/capture/DXGI/dll/deyfh.s Normal file
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@ -0,0 +1,16 @@
# IMAGE_IMPORT_DESCRIPTOR
.section .idata$2
.global _head_C__msys64_home_Geoff_LookingGlass_host_release_platform_Windows_capture_DXGI_libd3d11_dll
_head_C__msys64_home_Geoff_LookingGlass_host_release_platform_Windows_capture_DXGI_libd3d11_dll:
.rva hname #Ptr to image import by name list
#this should be the timestamp, but NT sometimes
#doesn't load DLLs when this is set.
.long 0 # loaded time
.long 0 # Forwarder chain
.rva __C__msys64_home_Geoff_LookingGlass_host_release_platform_Windows_capture_DXGI_libd3d11_dll_iname # imported dll's name
.rva fthunk # pointer to firstthunk
#Stuff for compatibility
.section .idata$5
fthunk:
.section .idata$4
hname:

34
host/platform/Windows/include/windows/delay.h Normal file
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@ -0,0 +1,34 @@
/**
* Looking Glass
* Copyright (C) 2017-2021 The Looking Glass Authors
* https://looking-glass.io
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include <Windows.h>
typedef NTSTATUS (__stdcall *ZwSetTimerResolution_t)(ULONG RequestedResolution,
BOOLEAN Set, PULONG ActualResolution);
extern ZwSetTimerResolution_t ZwSetTimerResolution;
typedef NTSTATUS (__stdcall *NtDelayExecution_t)(BOOL Alertable,
PLARGE_INTEGER DelayInterval);
extern NtDelayExecution_t NtDelayExecution;
void delayInit(void);
// like sleep but more accurate
void delayExecution(float ms);

49
host/platform/Windows/src/delay.c Normal file
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@ -0,0 +1,49 @@
/**
* Looking Glass
* Copyright (C) 2017-2021 The Looking Glass Authors
* https://looking-glass.io
*
* This program is free software; you can redistribute it and/or modify it
* under the terms of the GNU General Public License as published by the Free
* Software Foundation; either version 2 of the License, or (at your option)
* any later version.
*
* This program is distributed in the hope that it will be useful, but WITHOUT
* ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or
* FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for
* more details.
*
* You should have received a copy of the GNU General Public License along
* with this program; if not, write to the Free Software Foundation, Inc., 59
* Temple Place, Suite 330, Boston, MA 02111-1307 USA
*/
#include "windows/delay.h"
#include "common/debug.h"
NtDelayExecution_t NtDelayExecution;
ZwSetTimerResolution_t ZwSetTimerResolution;
void delayInit(void)
{
HMODULE ntdll = GetModuleHandle("ntdll.dll");
NtDelayExecution = (NtDelayExecution_t)
GetProcAddress(ntdll, "NtDelayExecution");
// Increase the timer resolution
ZwSetTimerResolution = (ZwSetTimerResolution_t)
GetProcAddress(ntdll, "ZwSetTimerResolution");
if (ZwSetTimerResolution)
{
ULONG actualResolution;
ZwSetTimerResolution(1, true, &actualResolution);
DEBUG_INFO("System timer resolution: %lu ns", actualResolution * 100);
}
}
void delayExecution(float ms)
{
LARGE_INTEGER interval = { .QuadPart = -1 * (int)(ms * 1000.0f) };
NtDelayExecution(FALSE, &interval);
}

3
host/platform/Windows/src/mousehook.c
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@ -19,6 +19,7 @@
*/
#include "windows/mousehook.h"
#include "windows/delay.h"
#include "common/windebug.h"
#include "platform.h"
@ -104,7 +105,7 @@ static DWORD WINAPI updateThreadProc(LPVOID lParam)
mouseHook.callback(mouseHook.x, mouseHook.y);
// limit this to 1000Hz, who has a mouse that updates faster anyway?
Sleep(1);
delayExecution(1.0f);
break;
}
}

14
host/platform/Windows/src/platform.c
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@ -20,6 +20,7 @@
#include "platform.h"
#include "service.h"
#include "windows/delay.h"
#include "windows/mousehook.h"
#include <windows.h>
@ -61,10 +62,6 @@ struct AppState
static struct AppState app = {0};
HWND MessageHWND;
// undocumented API to adjust the system timer resolution (yes, its a nasty hack)
typedef NTSTATUS (__stdcall *ZwSetTimerResolution_t)(ULONG RequestedResolution, BOOLEAN Set, PULONG ActualResolution);
static ZwSetTimerResolution_t ZwSetTimerResolution = NULL;
// linux mingw64 is missing this
#ifndef MSGFLT_RESET
#define MSGFLT_RESET (0)
@ -513,14 +510,7 @@ bool app_init(void)
// always flush stderr
setbuf(stderr, NULL);
// Increase the timer resolution
ZwSetTimerResolution = (ZwSetTimerResolution_t)GetProcAddress(GetModuleHandle("ntdll.dll"), "ZwSetTimerResolution");
if (ZwSetTimerResolution)
{
ULONG actualResolution;
ZwSetTimerResolution(1, true, &actualResolution);
DEBUG_INFO("System timer resolution: %lu ns", actualResolution * 100);
}
delayInit();
// get the performance frequency for spinlocks
QueryPerformanceFrequency(&app.perfFreq);