mirror of https://github.com/polybar/polybar.git
74 lines
1.2 KiB
C++
74 lines
1.2 KiB
C++
#pragma once
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#include <atomic>
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#include <mutex>
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#include <thread>
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#include "common.hpp"
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#include "utils/mixins.hpp"
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POLYBAR_NS
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namespace this_thread = std::this_thread;
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using std::thread;
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template <typename T>
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using atomic = std::atomic<T>;
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using stateflag = atomic<bool>;
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namespace concurrency_util {
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namespace locking_strategy {
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struct no_backoff {
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bool operator()() {
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return true;
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}
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};
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struct yield_backoff {
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bool operator()() {
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this_thread::yield();
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return false;
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}
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};
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}
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class spin_lock : public non_copyable_mixin<spin_lock> {
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public:
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/**
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* Construct spin_lock
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*/
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spin_lock() = default;
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/**
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* Lock using custom strategy
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*/
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template <typename Backoff>
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void lock(Backoff backoff) noexcept {
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while (m_locked.test_and_set(std::memory_order_acquire)) {
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backoff();
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}
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}
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/**
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* Lock using default strategy
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*/
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void lock() noexcept {
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lock(locking_strategy::no_backoff{});
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}
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/**
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* Unlock
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*/
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void unlock() noexcept {
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m_locked.clear(std::memory_order_release);
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}
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protected:
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std::atomic_flag m_locked{false};
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};
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}
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POLYBAR_NS_END
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