106 lines
1.9 KiB
C++
106 lines
1.9 KiB
C++
#include <condition_variable>
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#include <cstdio>
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#include <iostream>
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#include <memory>
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#include <mutex>
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#include <queue>
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#include <thread>
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template <typename T>
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class queue {
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private:
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mutable std::mutex mut;
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std::queue<T> data_queue;
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std::condition_variable data_cond;
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public:
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queue() {}
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queue(const queue& other)
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{
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std::lock_guard<std::mutex> lk(other.mut);
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data_queue = other.data_queue;
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}
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void push(T new_value)
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{
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std::lock_guard<std::mutex> lk(mut);
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data_queue.push(new_value);
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data_cond.notify_one();
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}
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void wait_and_pop(T& value)
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{
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std::unique_lock<std::mutex> lk(mut);
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data_cond.wait(lk, [this] { return !data_queue.empty(); });
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value = data_queue.front();
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data_queue.pop();
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}
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std::shared_ptr<T> wait_and_pop()
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{
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std::unique_lock<std::mutex> lk(mut);
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data_cond.wait(lk, [this] { return !data_queue.empty(); });
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std::shared_ptr<T> res(std::make_shared<T>(data_queue.front()));
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data_queue.pop();
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return res;
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}
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bool try_pop(T& value)
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{
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std::lock_guard<std::mutex> lk(mut);
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if (data_queue.empty()) {
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return false;
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}
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value = data_queue.front();
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data_queue.pop();
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return true;
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}
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std::shared_ptr<T> try_pop()
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{
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std::lock_guard<std::mutex> lk(mut);
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if (data_queue.empty()) {
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return std::shared_ptr<T>();
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}
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std::shared_ptr<T> res(std::make_shared<T>(data_queue.front()));
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data_queue.pop();
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return res;
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}
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bool empty() const
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{
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std::lock_guard<std::mutex> lk(mut);
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return data_queue.empty();
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}
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};
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void
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push(queue<int>* q)
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{
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for (int i = 0; i < 10; ++i) {
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// std::cout << "pushing " << i << std::endl;
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printf("pushing %d\n", i);
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q->push(i);
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}
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}
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void
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pop(queue<int>* q)
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{
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for (int i = 0; i < 10; ++i) {
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printf("poping %d\n", *q->wait_and_pop());
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}
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}
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int
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main()
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{
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queue<int> q;
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std::thread t1(push, &q);
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std::thread t2(pop, &q);
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t1.join();
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t2.join();
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return 0;
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}
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