/C++/C++ synchronization primitives example programs

C++ synchronization primitives example programs

 
#include <queue>
#include <memory>
#include <mutex>
#include <condition_variable>
template<typename T>
class threadsafe_queue
{
private:
    mutable std::mutex mut;      ❶ 
    std::queue<T> data_queue;
    std::condition_variable data_cond;
public:
    threadsafe_queue()
    {}
    threadsafe_queue(threadsafe_queue const& other)
    {
        std::lock_guard<std::mutex> lk(other.mut);
        data_queue=other.data_queue;
    }
    void push(T new_value)
    {
        std::lock_guard<std::mutex> lk(mut);
        data_queue.push(new_value);
        data_cond.notify_one();
    }
    void wait_and_pop(T& value)
    {
        std::unique_lock<std::mutex> lk(mut);
        data_cond.wait(lk,[this]{return !data_queue.empty();});
        value=data_queue.front();
        data_queue.pop();
    }
    std::shared_ptr<T> wait_and_pop()
    {
        std::unique_lock<std::mutex> lk(mut);
        data_cond.wait(lk,[this]{return !data_queue.empty();});
        std::shared_ptr<T> res(std::make_shared<T>(data_queue.front()));
        data_queue.pop();
        return res;
    }
    bool try_pop(T& value)
    {
        std::lock_guard<std::mutex> lk(mut);
        if(data_queue.empty())
            return false;
        value=data_queue.front();
        data_queue.pop();
        return true;
    }
    std::shared_ptr<T> try_pop()
    {
        std::lock_guard<std::mutex> lk(mut);
        if(data_queue.empty())
            return std::shared_ptr<T>();
        std::shared_ptr<T> res(std::make_shared<T>(data_queue.front()));
        data_queue.pop();
        return res;
    }
    bool empty() const
    {
        std::lock_guard<std::mutex> lk(mut);
        return data_queue.empty();
    }
};

Source: freecontent.manning.com

Similar codes

22 votes205 views3 answers
Get line C++
C++
0 vote212 views1 answer
C++ check if number is even or odd
C++
267 votes396 views1 answer
Visual studio c++ compiler
C++
0 vote189 views1 answer
How to extract a bit from a byte in c++
C++
104 votes507 views6 answers
Convert int to string c++
C++
7 votes214 views2 answers
Qt int to string
C++
0 vote176 views1 answer
Hashset in cpp
C++
0 vote232 views1 answer
Pascal triangle using c++
C++
0 vote173 views1 answer
Remove digit from number c++
C++
0 vote195 views1 answer
Walk filesystem in c++
C++