ordered (OpenMP Directives)

 

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Specifies that code under a parallelized for loop should be executed like a sequential loop.

#pragma omp ordered  
   structured-block  

The ordered directive must be within the dynamic extent of a for or parallel for construct with an ordered clause.

The ordered directive supports no OpenMP clauses.

For more information, see 2.6.6 ordered Construct.

// omp_ordered.cpp  
// compile with: /openmp   
#include <stdio.h>  
#include <omp.h>  
  
static float a[1000], b[1000], c[1000];  
  
void test(int first, int last)   
{  
    #pragma omp for schedule(static) ordered  
    for (int i = first; i <= last; ++i) {  
        // Do something here.  
        if (i % 2)   
        {  
            #pragma omp ordered   
            printf_s("test() iteration %d\n", i);  
        }  
    }  
}  
  
void test2(int iter)   
{  
    #pragma omp ordered  
    printf_s("test2() iteration %d\n", iter);  
}  
  
int main( )   
{  
    int i;  
    #pragma omp parallel  
    {  
        test(1, 8);  
        #pragma omp for ordered  
        for (i = 0 ; i < 5 ; i++)  
            test2(i);  
    }  
}  

test() iteration 1  
test() iteration 3  
test() iteration 5  
test() iteration 7  
test2() iteration 0  
test2() iteration 1  
test2() iteration 2  
test2() iteration 3  
test2() iteration 4  

Directives

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