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CircularQueue.hpp
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CircularQueue.hpp
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#pragma once
#include "main.hpp"
#include <queue>
#include <mutex>
#include <condition_variable>
template < typename T >
class CircularQueue
{
private:
std::queue<T> q;
mutable std::mutex m;
std::condition_variable c;
unsigned int max_size;
public:
CircularQueue(unsigned int max_size) : q(), m(), c(), max_size(max_size)
{
}
~CircularQueue(void)
{
}
void enqueue(T t)
{
std::lock_guard<std::mutex> lock(m);
//unlock method is automatically excuted when destructor called
if (q.size() > max_size)
q.pop();
q.push(t);
c.notify_one();
}
T dequeue(void)
{
std::unique_lock<std::mutex> lock(m);
//unique lock doesn't try lock when mutex is already locked.
// but call unlock method when destructor called
while(q.empty())
{
c.wait(lock);
}
T val = q.front();
q.pop();
return val;
}
int size(void)
{
return q.size();
}
};