45 lines
1.0 KiB
C++
45 lines
1.0 KiB
C++
template<typename T>
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class threadsafe_queue
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{
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private:
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std::unique_ptr<node> try_pop_head()
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{
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std::lock_guard<std::mutex> head_lock(head_mutex);
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if(head.get()==get_tail())
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{
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return std::unique_ptr<node>();
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}
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return pop_head();
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}
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std::unique_ptr<node> try_pop_head(T& value)
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{
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std::lock_guard<std::mutex> head_lock(head_mutex);
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if(head.get()==get_tail())
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{
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return std::unique_ptr<node>();
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}
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value=std::move(*head->data);
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return pop_head();
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}
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public:
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std::shared_ptr<T> try_pop()
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{
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std::unique_ptr<node> const old_head=try_pop_head();
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return old_head?old_head->data:std::shared_ptr<T>();
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}
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bool try_pop(T& value)
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{
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std::unique_ptr<node> const old_head=try_pop_head(value);
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return old_head;
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}
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void empty()
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{
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std::lock_guard<std::mutex> head_lock(head_mutex);
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return (head==get_tail());
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}
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};
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