ordered (OpenMP Directives)
Specifies that code under a parallelized for loop should be executed like a sequential loop.
#pragma omp ordered
structured-block
Remarks
The ordered directive must be within the dynamic extent of a for (OpenMP) or parallel for construct with an ordered clause.
The ordered directive supports no OpenMP clauses.
For more information, see 2.6.6 ordered Construct.
Example
// 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