/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

5 votes278 views2 answers
Vbs check if file exists
C++
0 vote220 views1 answer
Sleep not declared in this scope c++
C++
0 vote258 views1 answer
Enter the value of integer n. Print the figure as shown below.(3) Sample input 5 Sample output ***** **** *** ** *
C++
1 vote261 views1 answer
Include spaces while reading strings in cpp
C++
3 votes246 views2 answers
C++ input integer
C++
-1 vote252 views1 answer
Flags of open operation c++
C++
0 vote294 views1 answer
Create dynamic variable c++
C++
3 votes274 views2 answers
Iomanip
C++
3 votes262 views1 answer
How i say hello world in c++
C++
0 vote274 views1 answer
Google test assert throw
C++