Testing threads in c++

main.cpp

#include <chrono>
#include <iostream>
#include <memory>
#include <thread>
#include <vector>

// remember to add -pthread to the compile options.
// Run example: https://godbolt.org/z/Efnzxq9a1

int main() {
    // Start
    std::cout << "MAIN START" << std::endl;
    auto start = std::chrono::high_resolution_clock::now();

    // Vector for thread pool
    std::vector<std::unique_ptr<std::thread>> pool;

    // Create each thread
    for (int id = 0; id < 10; id++) {
        // Push the lambda to execute into the thread and store in the pool
        pool.push_back(std::make_unique<std::thread>([id]() {
            std::cout << "Thread[" << id << "] START" << std::endl;
            std::this_thread::sleep_for(std::chrono::seconds(1));
            std::cout << "Thread[" << id << "] END" << std::endl;
        }));
    }

    // Print main thread
    auto mid = std::chrono::high_resolution_clock::now();
    std::cout << "MAIN THREAD time elapsed: "
              << std::chrono::duration<double, std::milli>(mid - start).count()
              << " ms" << std::endl;

    // Join all threads
    for (auto &thread : pool) thread->join();

    // Print time elapsed
    auto end = std::chrono::high_resolution_clock::now();
    std::cout << "Elapsed time: "
              << std::chrono::duration<double, std::milli>(end - start).count()
              << " ms" << std::endl;

    // End
    std::cout << "MAIN END" << std::endl;
    return 0;
}