#include <chrono>

#include <cstdio>

#include <iostream>

#include <thread>

void foo() {

std::cout << "This thread id: " << std::this_thread::get_id() << std::endl;

}

void get_id_test() {

std::thread thread_1(foo);

std::thread thread_2(foo);

std::thread thread_3(foo);

std::cout << "thread_1 id: " << thread_1.get_id() << std::endl;

std::cout << "thread_2 id: " << thread_2.get_id() << std::endl;

std::cout << "thread_3 id: " << thread_3.get_id() << std::endl;

thread_1.join();

thread_2.join();

thread_3.join();

// ID of non-executing thread.

std::thread thread_4;

std::cout << "thread_4 id: " << thread_4.get_id() << std::endl;

}

void display_hardware_concurrency() {

std::cout << "Allowed max number of parallel threads : "

<< std::thread::hardware_concurrency() << std::endl;

}

thread_local int sample_local_integer = 0;

int sample_normal_integer = 0;

void thread_local_sample() {

auto fn = []() {

++sample_local_integer;

++sample_normal_integer;

printf("- local integer: %d, normal integer: %d\n", sample_local_integer,

sample_normal_integer);

};

std::thread t1(fn);

std::thread t2(fn);

std::thread t3(fn);

t1.join();

t2.join();

t3.join();

}

int main() {

get_id_test();

display_hardware_concurrency();

thread_local_sample();

}