43 lines
1.2 KiB
C++
43 lines
1.2 KiB
C++
// SPDX-License-Identifier: BSD-2-Clause
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// This code is part of the sfizz library and is licensed under a BSD 2-clause
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// license. You should have receive a LICENSE.md file along with the code.
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// If not, contact the sfizz maintainers at https://github.com/sfztools/sfizz
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#include "SpinMutex.h"
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#include <atomic_queue/defs.h>
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#include <thread>
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// based on Timur Doumler's implementation advice for spinlocks
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void SpinMutex::lock() noexcept
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{
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for (int i = 0; i < 5; ++i) {
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if (try_lock())
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return;
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}
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for (int i = 0; i < 10; ++i) {
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if (try_lock())
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return;
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atomic_queue::spin_loop_pause();
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}
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for (;;) {
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for (int i = 0; i < 3000; ++i) {
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if (try_lock())
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return;
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atomic_queue::spin_loop_pause();
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atomic_queue::spin_loop_pause();
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atomic_queue::spin_loop_pause();
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atomic_queue::spin_loop_pause();
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atomic_queue::spin_loop_pause();
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atomic_queue::spin_loop_pause();
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atomic_queue::spin_loop_pause();
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atomic_queue::spin_loop_pause();
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atomic_queue::spin_loop_pause();
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atomic_queue::spin_loop_pause();
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}
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std::this_thread::yield();
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}
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}
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