35 lines
712 B
C++
35 lines
712 B
C++
#pragma once
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#include <atomic>
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#include "utils/crtp.hpp"
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#include "threading/sync/lockable.hpp"
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template <class Derived>
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class LazyGC : Crtp<Derived>, Lockable<SpinLock>
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{
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public:
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void add_ref()
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{
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ref_count.fetch_add(1, std::memory_order_relaxed);
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}
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void release_ref()
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{
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// get refcount and subtract atomically
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auto count = ref_count.fetch_sub(1, std::memory_order_acq_rel);
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// fetch_sub first returns and then subtrarcts so the refcount is
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// zero when fetch_sub returns 1
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if(count != 1)
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return;
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auto guard = this->aacquire();
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this->derived().vacuum();
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}
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private:
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std::atomic<int> ref_count {0};
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};
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