mirror of https://github.com/axmolengine/axmol.git
106 lines
3.6 KiB
C++
106 lines
3.6 KiB
C++
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//////////////////////////////////////////////////////////////////////////////////////////
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// A multi-platform support c++11 library with focus on asynchronous socket I/O for any
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// client application.
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//////////////////////////////////////////////////////////////////////////////////////////
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/*
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The MIT License (MIT)
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Copyright (c) 2012-2023 HALX99
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Permission is hereby granted, free of charge, to any person obtaining a copy
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of this software and associated documentation files (the "Software"), to deal
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in the Software without restriction, including without limitation the rights
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to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
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copies of the Software, and to permit persons to whom the Software is
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furnished to do so, subject to the following conditions:
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The above copyright notice and this permission notice shall be included in all
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copies or substantial portions of the Software.
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THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
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IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
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AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
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LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
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OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
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SOFTWARE.
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*/
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#pragma once
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#ifdef _WIN32
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# include "yasio/config.hpp"
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# include "yasio/utils.hpp"
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# if defined(YASIO__USE_TIMEAPI)
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# include <timeapi.h>
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# pragma comment(lib, "Winmm.lib")
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# endif
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namespace yasio
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{
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/**
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* CLASS wtimer_hres: The windows timer high-resolution setup helper
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*/
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struct wtimer_hres {
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using NTSTATUS = LONG;
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/**
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* @param res the timer resolution in 100-ns units: 100-ns * 10000 = 1ms
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* @remark
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* - timeapi timeBeginPeriod max resolution is 1ms
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* - ZwSetTimerResolution max resolution is 0.5ms aka 100-ns * 5000
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*/
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static const ULONG _1ms_den = 10000;
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wtimer_hres(ULONG timer_res = _1ms_den)
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{
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# if defined(YASIO__USE_TIMEAPI)
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TIMECAPS tc;
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if (TIMERR_NOERROR == timeGetDevCaps(&tc, sizeof(TIMECAPS)))
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{
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timer_res_ = yasio::clamp(static_cast<UINT>(timer_res / _1ms_den), tc.wPeriodMin, tc.wPeriodMax);
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timeBeginPeriod(timer_res_);
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}
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# else
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do
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{
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HMODULE hNtDll = GetModuleHandleW(L"ntdll");
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if (!hNtDll)
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break;
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NTSTATUS(__stdcall * NtQueryTimerResolution)
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(OUT PULONG MinimumResolution, OUT PULONG MaximumResolution, OUT PULONG CurrentResolution) =
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reinterpret_cast<NTSTATUS(__stdcall*)(PULONG, PULONG, PULONG)>(GetProcAddress(hNtDll, "NtQueryTimerResolution"));
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if (!NtQueryTimerResolution)
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break;
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ZwSetTimerResolution = reinterpret_cast<NTSTATUS(__stdcall*)(ULONG, BOOLEAN, PULONG)>(GetProcAddress(hNtDll, "ZwSetTimerResolution"));
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if (!ZwSetTimerResolution)
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break;
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ULONG MinimumResolution, MaximumResolution, CurrentResolution;
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if (NtQueryTimerResolution(&MinimumResolution, &MaximumResolution, &CurrentResolution) != 0)
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break;
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ZwSetTimerResolution(yasio::clamp(timer_res, MaximumResolution, MinimumResolution), TRUE, &timer_res);
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} while (false);
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# endif
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}
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~wtimer_hres()
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{
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# if defined(YASIO__USE_TIMEAPI)
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if (timer_res_ != 0)
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timeEndPeriod(timer_res_);
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# else
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if (timer_res_)
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ZwSetTimerResolution(timer_res_, FALSE, nullptr);
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# endif
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}
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# if defined(YASIO__USE_TIMEAPI)
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UINT timer_res_{0};
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# else
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NTSTATUS(__stdcall* ZwSetTimerResolution)
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(IN ULONG RequestedResolution, IN BOOLEAN Set, OUT PULONG ActualResolution){nullptr};
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ULONG timer_res_{0};
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# endif
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};
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} // namespace yasio
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#endif
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