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C++ Fundamentals for Professionals

Methods of Threads in Practice

Explore key threading methods in C++ to understand how to manage multiple threads' execution and synchronization, ensuring safe and predictable program flow. This lesson guides you through practical use of thread joining and highlights challenges in sharing mutable variables across threads.

We'll cover the following...

Some of the most commonly used thread methods are in the following code widget:

C++
// threadMethods.cpp
#include <iostream>
#include <thread>
using namespace std;
int main(){
  cout << boolalpha << endl;
  cout << "hardware_concurrency()= "<< thread::hardware_concurrency() << endl;
  thread t1([]{cout << "t1 with id= " << this_thread::get_id() << endl;});
  thread t2([]{cout << "t2 with id= " << this_thread::get_id() << endl;});
  cout << endl;
  cout << "FROM MAIN: id of t1 " << t1.get_id() << endl;
  cout << "FROM MAIN: id of t2 " << t2.get_id() << endl;
  cout << endl;
  swap(t1,t2);
  cout << "FROM MAIN: id of t1 " << t1.get_id() << endl;
  cout << "FROM MAIN: id of t2 " << t2.get_id() << endl;
  cout << endl;
  cout << "FROM MAIN: id of main= " << this_thread::get_id() << endl;
  
  cout << endl;
  
  cout << "t1.joinable(): " << t1.joinable() << endl;
  
  cout << endl;
  t1.join();
  t2.join();
  
  cout << endl;
  
  cout << "t1.joinable(): " << t1.joinable() << endl;
  cout << endl;
}

In combination with the output, the program should be quite easy ...