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55 lines
1.0 KiB
C++
55 lines
1.0 KiB
C++
#ifndef _LP_SIGLETON_SYS_H_
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#define _LP_SIGLETON_SYS_H_
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#include <mutex>
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#include <atomic>
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namespace SystemLog {
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template<class T>
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class lp_singleton_sys
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{
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public:
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static T* instance()
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{
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T *sin = sys_this.load(std::memory_order_acquire);
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if (!sin) {
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std::lock_guard<std::mutex> locker(sys_mutex);
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sin = sys_this.load(std::memory_order_relaxed);
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if (!sin) {
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sin = new T;
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sys_this.store(sin, std::memory_order_release);
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}
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}
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return sin;
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}
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static void uninstance()
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{
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T *sin = sys_this.load(std::memory_order_relaxed);
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if (sin) {
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std::lock_guard<std::mutex> locker(sys_mutex);
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delete sin;
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sin = nullptr;
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}
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}
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protected:
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lp_singleton_sys() = default;
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virtual ~lp_singleton_sys() = default;
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private:
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lp_singleton_sys(const T&) = delete;
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T& operator=(const T&) = delete;
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static std::atomic<T*> sys_this;
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static std::mutex sys_mutex;
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};
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template<class T>
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std::atomic<T*> lp_singleton_sys<T>::sys_this;
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template<class T>
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std::mutex lp_singleton_sys<T>::sys_mutex;
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}
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#endif
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