How do I use thread pools and executors?

Thread pools and executors are essential for managing multiple threads in C++. They help in optimizing resource use and managing thread life cycles efficiently. In C++, you can create a thread pool that allows a defined number of threads to execute tasks concurrently, improving performance for I/O-bound or compute-bound workloads.

Using Thread Pools and Executors in C++

Here is a simple example of how to implement a thread pool in C++ using the standard library:


#include 
#include 
#include 
#include 
#include 
#include 
#include 

class ThreadPool {
public:
    ThreadPool(size_t threads);
    ~ThreadPool();
    
    template
    void enqueue(F&& f);

private:
    std::vector<:thread> workers;
    std::queue<:function>> tasks;
    
    std::mutex queue_mutex;
    std::condition_variable condition;
    std::atomic stop;
};

ThreadPool::ThreadPool(size_t threads) : stop(false) {
    for(size_t i = 0; i < threads; ++i) {
        workers.emplace_back([this] {
            for(;;) {
                std::function task;
                {
                    std::unique_lock<:mutex> lock(this->queue_mutex);
                    this->condition.wait(lock, [this] { return this->stop || !this->tasks.empty(); });
                    if(this->stop && this->tasks.empty()) return;
                    task = std::move(this->tasks.front());
                    this->tasks.pop();
                }
                task();
            }
        });
    }
}

ThreadPool::~ThreadPool() {
    {
        std::unique_lock<:mutex> lock(queue_mutex);
        stop = true;
    }
    condition.notify_all();
    for(auto &worker: workers) worker.join();
}

template
void ThreadPool::enqueue(F&& f) {
    {
        std::unique_lock<:mutex> lock(queue_mutex);
        tasks.emplace(std::forward(f));
    }
    condition.notify_one();
}

int main() {
    ThreadPool pool(4); // Create a thread pool with 4 threads

    // Enqueue tasks
    for(int i = 0; i < 8; ++i) {
        pool.enqueue([i] {
            std::cout << "Task " << i << " is being executed" << std::endl;
        });
    }

    return 0;
}

How do I use thread pools and executors?

Using Thread Pools and Executors in C++

Popular Topics

Recent Languages

How do I use thread pools and executors?

Using Thread Pools and Executors in C++

Related Questions

Popular Topics

Recent Languages