C++ Fundamentals for Professionals/

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Threads vs. Tasks

Threads vs. Tasks

This lesson highlights the differences between the threads and tasks that are used in C++ for concurrency.

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Threads are very different from tasks. Let’s look at this piece of code to see how:

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// asyncVersusThread.cpp
#include <future>
#include <thread>
#include <iostream>
int main(){
  std::cout << std::endl;
  int res;
  std::thread t([&]{ res = 2000 + 11; });
  t.join();
  std::cout << "res: " << res << std::endl;             
  auto fut= std::async([]{ return 2000 + 11; });
  std::cout << "fut.get(): " << fut.get() << std::endl;   
  std::cout << std::endl;   
}

The child thread t and the asynchronous function call ...