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[host] delay: directly link against ntdll.dll
There is no need to LoadLibrary and GetProcAddress to get pointers to NtDelayExecution or NtSetTimerResolution. These functions don't have prototypes in any SDK header, but they are exported in ntdll.dll and we can simply declare the prototype and link ntdll. There is also no chance that the functions do not exist: I checked an old install of Windows NT 4.0 and both of these functions exist. Also used NtSetTimerResolution instead of ZeSetTimerResolution for consistency (they are the same). Also changed system timer resolution log message units to μs with one decimal digit for readability. This is the actual amount of precision available to us.
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@ -24,6 +24,7 @@ target_link_libraries(platform_Windows
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capture
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userenv
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ntdll
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wtsapi32
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psapi
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shlwapi
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@ -20,14 +20,6 @@
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#include <windows.h>
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typedef NTSTATUS (__stdcall *ZwSetTimerResolution_t)(ULONG RequestedResolution,
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BOOLEAN Set, PULONG ActualResolution);
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extern ZwSetTimerResolution_t ZwSetTimerResolution;
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typedef NTSTATUS (__stdcall *NtDelayExecution_t)(BOOL Alertable,
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PLARGE_INTEGER DelayInterval);
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extern NtDelayExecution_t NtDelayExecution;
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void delayInit(void);
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// like sleep but more accurate
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@ -21,25 +21,22 @@
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#include "windows/delay.h"
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#include "common/debug.h"
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NtDelayExecution_t NtDelayExecution;
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ZwSetTimerResolution_t ZwSetTimerResolution;
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NTSYSCALLAPI NTSTATUS NTAPI NtDelayExecution(
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_In_ BOOLEAN Alertable,
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_In_opt_ PLARGE_INTEGER DelayInterval
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);
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NTSYSCALLAPI NTSTATUS NTAPI NtSetTimerResolution(
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_In_ ULONG DesiredTime,
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_In_ BOOLEAN SetResolution,
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_Out_ PULONG ActualTime
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);
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void delayInit(void)
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{
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HMODULE ntdll = GetModuleHandle("ntdll.dll");
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NtDelayExecution = (NtDelayExecution_t)
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GetProcAddress(ntdll, "NtDelayExecution");
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// Increase the timer resolution
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ZwSetTimerResolution = (ZwSetTimerResolution_t)
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GetProcAddress(ntdll, "ZwSetTimerResolution");
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if (ZwSetTimerResolution)
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{
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ULONG actualResolution;
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ZwSetTimerResolution(1, true, &actualResolution);
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DEBUG_INFO("System timer resolution: %lu ns", actualResolution * 100);
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}
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ULONG actualResolution;
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NtSetTimerResolution(1, true, &actualResolution);
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DEBUG_INFO("System timer resolution: %.1f μs", actualResolution / 10.0);
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}
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void delayExecution(float ms)
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