mirror of
https://github.com/autc04/Retro68.git
synced 2024-12-27 07:31:35 +00:00
65 lines
1.6 KiB
C
65 lines
1.6 KiB
C
/******************************************************************************
|
|
* FILE: omp_workshare2.c
|
|
* DESCRIPTION:
|
|
* OpenMP Example - Sections Work-sharing - C/C++ Version
|
|
* In this example, the OpenMP SECTION directive is used to assign
|
|
* different array operations to threads that execute a SECTION. Each
|
|
* thread receives its own copy of the result array to work with.
|
|
* AUTHOR: Blaise Barney 5/99
|
|
* LAST REVISED: 04/06/05
|
|
******************************************************************************/
|
|
#include <omp.h>
|
|
#include <stdio.h>
|
|
#include <stdlib.h>
|
|
#define N 50
|
|
|
|
int main (int argc, char *argv[]) {
|
|
|
|
int i, nthreads, tid;
|
|
float a[N], b[N], c[N];
|
|
|
|
/* Some initializations */
|
|
for (i=0; i<N; i++)
|
|
a[i] = b[i] = i * 1.0;
|
|
|
|
#pragma omp parallel shared(a,b,nthreads) private(c,i,tid)
|
|
{
|
|
tid = omp_get_thread_num();
|
|
if (tid == 0)
|
|
{
|
|
nthreads = omp_get_num_threads();
|
|
printf("Number of threads = %d\n", nthreads);
|
|
}
|
|
printf("Thread %d starting...\n",tid);
|
|
|
|
#pragma omp sections nowait
|
|
{
|
|
#pragma omp section
|
|
{
|
|
printf("Thread %d doing section 1\n",tid);
|
|
for (i=0; i<N; i++)
|
|
{
|
|
c[i] = a[i] + b[i];
|
|
printf("Thread %d: c[%d]= %f\n",tid,i,c[i]);
|
|
}
|
|
}
|
|
|
|
#pragma omp section
|
|
{
|
|
printf("Thread %d doing section 2\n",tid);
|
|
for (i=0; i<N; i++)
|
|
{
|
|
c[i] = a[i] * b[i];
|
|
printf("Thread %d: c[%d]= %f\n",tid,i,c[i]);
|
|
}
|
|
}
|
|
|
|
} /* end of sections */
|
|
|
|
printf("Thread %d done.\n",tid);
|
|
|
|
} /* end of parallel section */
|
|
|
|
return 0;
|
|
}
|