Run miner threads at priority SCHED_IDLE (see sched(7))
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| // Copyright (c) 2014-2022, The Monero Project | ||
| // | ||
| // All rights reserved. | ||
| // | ||
| // Redistribution and use in source and binary forms, with or without modification, are | ||
| // permitted provided that the following conditions are met: | ||
| // | ||
| // 1. Redistributions of source code must retain the above copyright notice, this list of | ||
| // conditions and the following disclaimer. | ||
| // | ||
| // 2. Redistributions in binary form must reproduce the above copyright notice, this list | ||
| // of conditions and the following disclaimer in the documentation and/or other | ||
| // materials provided with the distribution. | ||
| // | ||
| // 3. Neither the name of the copyright holder nor the names of its contributors may be | ||
| // used to endorse or promote products derived from this software without specific | ||
| // prior written permission. | ||
| // | ||
| // THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS" AND ANY | ||
| // EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES OF | ||
| // MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL | ||
| // THE COPYRIGHT HOLDER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, | ||
| // SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO, | ||
| // PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS; OR BUSINESS | ||
| // INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN CONTRACT, | ||
| // STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF | ||
| // THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE. | ||
| // | ||
| // Parts of this file are originally copyright (c) 2012-2013 The Cryptonote developers | ||
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| #pragma once | ||
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| #include <utility> | ||
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| #include <boost/thread/thread.hpp> | ||
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| #ifdef _WIN32 | ||
| #include <windows.h> | ||
| #else | ||
| #include <pthread.h> | ||
| #include <sched.h> | ||
| #endif // _WIN32 | ||
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| namespace cryptonote | ||
| { | ||
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| // Creates and returns a thread running at an idle priority (if possible). | ||
| template<typename Callable> | ||
| boost::thread create_background_thread(boost::thread::attributes& attrs, Callable func); | ||
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| #ifdef _WIN32 | ||
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| template<typename Callable> | ||
| boost::thread create_background_thread(boost::thread::attributes& attrs, Callable func) { | ||
| return boost::thread(attrs, [func = std::move(func)]() mutable { | ||
| auto handle = GetCurrentThread(); | ||
| if (!SetThreadPriority(handle, THREAD_MODE_BACKGROUND_BEGIN)) { | ||
| if (!SetThreadPriority(handle, THREAD_PRIORITY_LOWEST)) { | ||
| MWARNING("Can't set a background thread priority: " | ||
| << std::error_code(GetLastError(), std::system_category())); | ||
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| } | ||
| } | ||
| std::move(func)(); | ||
| }); | ||
| } | ||
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| #else | ||
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| template<typename Callable> | ||
| boost::thread create_background_thread(boost::thread::attributes& attrs, Callable func) { | ||
| auto thread = boost::thread(attrs, std::move(func)); | ||
| auto handle = thread.native_handle(); | ||
| int policy; | ||
| struct sched_param param; | ||
| int error; | ||
| if ((error = pthread_getschedparam(handle, &policy, ¶m)) != 0) { | ||
| MWARNING("Can't set a background thread priority: pthread_getschedparam " | ||
| "failed: " << std::strerror(error)); | ||
| return thread; | ||
| } | ||
| #ifdef SCHED_IDLE | ||
| policy = SCHED_IDLE; | ||
| // In particular MacOS doesn't support `SCHED_IDLE`. In the future we might | ||
| // consider using https://developer.apple.com/documentation/dispatch | ||
| // instead. | ||
| #else | ||
| #warning SCHED_IDLE policy not available, falling back to minimum priority | ||
| param.sched_priority = sched_get_priority_min(policy); | ||
| #endif | ||
| if ((error = pthread_setschedparam(handle, policy, ¶m)) != 0) { | ||
| MWARNING("Can't set a background thread priority: pthread_setschedparam " | ||
| "to SCHED_IDLE failed: " << std::strerror(error)); | ||
| } | ||
| return thread; | ||
| } | ||
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| #endif | ||
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| } // namespace cryptonote |
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Minor gripe, but formatting should follow the rest of the file (here, braces on newlines).