thread.cpp

/* g++ -std=c++11 std_async.cpp -lpthread */
#include <iostream>
#include <thread>
#include <future>
#include <chrono>
#include <vector>
#include <mutex>
using namespace std;
thread_local int tls = 0;
std::mutex g_pages_mutex;
int Task(int a, int b)
{
  cout<<"Thread ID = "<<std::this_thread::get_id()<<" Enter"<<endl;
  while(true)
  {
    std::lock_guard<std::mutex> guard(g_pages_mutex);
    std::this_thread::sleep_for(std::chrono::seconds(1));
    cout<<"Thread ID = "<<std::this_thread::get_id()<<" Running"<<endl;
  }
  return b;
}
int main()
{
  std::thread::id this_id = std::this_thread::get_id();
  cout << "Main thread id = " << this_id << endl;

  auto fut = std::async(std::launch::async ,
    Task, 1, 7788);
  fut = std::async(std::launch::async ,
    Task, 1, 7788);
  return 0;
}