Robin Davies
69 lines
2.3 KiB
C++
69 lines
2.3 KiB
C++
/*
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* MIT License
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*
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* Copyright (c) 2022 Robin E. R. Davies
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*
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* Permission is hereby granted, free of charge, to any person obtaining a copy of
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* this software and associated documentation files (the "Software"), to deal in
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* the Software without restriction, including without limitation the rights to
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* use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies
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* of the Software, and to permit persons to whom the Software is furnished to do
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* so, subject to the following conditions:
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*
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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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*
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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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#include "ss.hpp"
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#include "Lv2Log.hpp"
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namespace pipedal
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{
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constexpr int RT_THREAD_PRIORITY = 80;
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/**
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* @brief RAII Priority boost to avoid Rt-thread priority inversion
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* Boosts current thread to realtime priority for the duration of the current scope.
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* Do this before acquiring a mutex that the RT thread might block on.
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*
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*/
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class RtInversionGuard
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{
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private:
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int currentScheduler;
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struct sched_param currentPriority;
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;
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public:
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RtInversionGuard()
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{
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currentScheduler = sched_getscheduler(0);
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sched_getparam(0, ¤tPriority);
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struct sched_param param;
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memset(¶m, 0, sizeof(param));
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param.sched_priority = RT_THREAD_PRIORITY;
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int result = sched_setscheduler(0, SCHED_RR, ¶m);
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if (result != 0)
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{
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Lv2Log::error(SS("Failed to set ALSA AudioThread priority. (" << strerror(result) << ")"));
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}
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}
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~RtInversionGuard()
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{
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sched_setscheduler(0, currentScheduler, ¤tPriority);
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}
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};
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} |