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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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16
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)
@@ -504,7 +501,7 @@ void boostPriority(void)
bool app_init(void)
{
const char * logFile = option_get_string("os", "logFile" );
const char * logFile = option_get_string("os", "logFile");
// redirect stderr to a file
if (logFile && strcmp(logFile, "stderr") != 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);