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112 lignes
3.1 KiB
112 lignes
3.1 KiB
#pragma once
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#include <atomic>
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#include <concepts>
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#include "gp_config.hpp"
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namespace gp {
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/**
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* @brief CADR lock_guard for generic locking mechanisms
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*
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* @tparam T
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*/
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template<typename T>
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class lock_guard {
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T& ref;
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public:
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lock_guard(T& _ref)
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: ref(_ref)
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{
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ref.lock();
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}
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~lock_guard() {
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ref.unlock();
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}
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};
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/**
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* @brief A fast mutual exclusion handler WITHOUT deadlock detection
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*/
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class fast_bottleneck {
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std::atomic_bool flag;
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public:
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fast_bottleneck() = default;
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fast_bottleneck(fast_bottleneck&) = delete;
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fast_bottleneck(fast_bottleneck&&) = delete;
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void lock() {
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while(not try_lock());
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}
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[[nodiscard]] bool try_lock() {
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bool f = false;
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bool t = true;
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return flag.compare_exchange_strong(f,t,std::memory_order::acquire);
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}
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void unlock() {
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gp_config::assertion(try_unlock(), "Unlocking failed in fast_bottleneck: potential double unlocking issue");
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}
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[[nodiscard]] bool try_unlock() {
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bool f = false;
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bool t = true;
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return flag.compare_exchange_strong(t,f,std::memory_order::release);
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}
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};
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/**
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* @brief A fast semaphore exclusion handler WITHOUT deadlock detection
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*/
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template<std::integral T, T default_increment, T maximum_increment>
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class fast_semaphore {
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std::atomic<T> flag;
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public:
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fast_semaphore() = default;
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fast_semaphore(fast_semaphore&) = delete;
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fast_semaphore(fast_semaphore&&) = delete;
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enum class tristate {
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success,
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timing,
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error
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};
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void lock_super() {
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auto value = flag.fetch_add(maximum_increment, std::memory_order::relaxed);
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while(value > maximum_increment) { value = flag.load(std::memory_order::release); }
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}
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template<T increment = default_increment>
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void lock() {
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while(not try_lock<increment>());
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}
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template<T increment = default_increment>
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[[nodiscard]] bool try_lock() {
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T expect = flag.load(std::memory_order::relaxed);
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T target = expect + increment;
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if(target > maximum_increment) return false;
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return flag.compare_exchange_strong(expect,target,std::memory_order::acquire);
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}
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template<T increment = default_increment>
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void unlock() {
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tristate v;
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do{ v = try_unlock<increment>(); }
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while(v == tristate::timing);
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gp_config::assertion(v == tristate::success, "Over unlocking may have happened");
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}
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template<T increment = default_increment>
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[[nodiscard]] tristate try_unlock() {
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T expect = flag.load(std::memory_order::relaxed);
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T target = expect - increment;
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if(target < 0) return tristate::error;
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return flag.compare_exchange_strong(expect,target,std::memory_order::release) ? tristate::success : tristate::timing;
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}
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};
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}
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