CODEWITHSUNDEEP
cfunctionparallel-processingopenmp
Ripon Patgiri
Ripon Patgiri

Reputation: 26

Multiple functions in OpenMP with C

Suppose I would like to run the functions in parallel.

   void foo()
   {
        foo1(args);
        foo2(args);
        foo3(args);
        foo4(args);
   }

I want these functions calls run in parallel. How can I run these functions in parallel in OpenMP with C?

Upvotes: 0

Views: 809

Answers (1)

Jim Cownie
Jim Cownie

Reputation: 2859

Assuming that the code is running serially when you enter foo(), you have a couple of different options.

Option 1: use sections

   void foo()
   {
#pragma omp parallel
     {
#pragma omp sections 
        {
#pragma omp section
          foo1(args);
#pragma omp section
          foo2(args);
#pragma omp section
          foo3(args);
#pragma omp section
          foo4(args);
        }
     }
   }

Option 2: use tasks

   void foo()
   {
#pragma omp parallel
     {
#pragma omp single 
        {
#pragma omp task
          foo1(args);
#pragma omp task
          foo2(args);
#pragma omp task
          foo3(args);
#pragma omp task
          foo4(args);
        }
     }
   }

Tasks are the more modern way of expressing this, and, potentially, allow you more freedom in controlling the execution.

Upvotes: 2

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