CODEWITHSUNDEEP
c++function
yasso
yasso

Reputation: 303

function run in the background c++

I created a function that run in while(1) and return an integer, I want to turn this function in background and recover their return.

who can help me please!

here is my function: 

int my_fct() {
    while(1) {
        int result = 1;
        return result;
    }
}

Upvotes: 0

Views: 6253

Answers (2)

Igor Popov
Igor Popov

Reputation: 2620

If you don't have access to C++11 and as you don't have access to pthreads as you are on Windows then you can use OpenMP. Most C++ compilers on both Unix-like systems and Windows support OpenMP. It is easier to use than pthreads. For example your problem can be coded like:

#include <omp.h>
int my_fct() {
    while(1) {
        int result = 1;
        return result;
    }
}
int main()
{
  #pragma omp sections
  {
    #pragma omp section
    {
      my_fct();
    }
    #pragma omp section
    {
      //some other code in parallel to my_fct
    }
  }
}

This is one option, take a look at OpenMP tutorials and you may find some other solutions as well.

As suggested in a comment you need to include appropriate compiler flag in order to compile with OpenMP support. It is /openmp for MS Visual C++ compiler and -fopenmp for GNU C++ compiler. You can find the correct flags for other compilers in their usage manuals.

Upvotes: 0

masoud
masoud

Reputation: 56479

How about std::async to compute it in a different thread:

int main()
{
    auto r = std::async(std::launch::async, my_fct);

    int result = r.get();    
}

Requires C++11 enabled.

Upvotes: 3

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