/******************************************************************************
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/******************************************************************************
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* OpenMP Example - Combined Parallel Loop Work-sharing - C/C++ Version
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* OpenMP Example - Combined Parallel Loop Work-sharing - C/C++ Version
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* FILE: omp_workshare4.c
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* FILE: omp_workshare4.c
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* DESCRIPTION:
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* DESCRIPTION:
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* This is a corrected version of the omp_workshare3.c example. Corrections
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* This is a corrected version of the omp_workshare3.c example. Corrections
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* include removing all statements between the parallel for construct and
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* include removing all statements between the parallel for construct and
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* the actual for loop, and introducing logic to preserve the ability to
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* the actual for loop, and introducing logic to preserve the ability to
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* query a thread's id and print it from inside the for loop.
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* query a thread's id and print it from inside the for loop.
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* SOURCE: Blaise Barney 5/99
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* SOURCE: Blaise Barney 5/99
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* LAST REVISED: 03/03/2002
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* LAST REVISED: 03/03/2002
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******************************************************************************/
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******************************************************************************/
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#include <omp.h>
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#include <omp.h>
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#include <stdio.h>
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#include <stdio.h>
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#define N 50
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#define N 50
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#define CHUNKSIZE 5
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#define CHUNKSIZE 5
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main () {
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main () {
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int i, chunk, tid;
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int i, chunk, tid;
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float a[N], b[N], c[N];
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float a[N], b[N], c[N];
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char first_time;
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char first_time;
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/* Some initializations */
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/* Some initializations */
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for (i=0; i < N; i++)
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for (i=0; i < N; i++)
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a[i] = b[i] = i * 1.0;
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a[i] = b[i] = i * 1.0;
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chunk = CHUNKSIZE;
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chunk = CHUNKSIZE;
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first_time = 'y';
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first_time = 'y';
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#pragma omp parallel for \
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#pragma omp parallel for \
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shared(a,b,c,chunk) \
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shared(a,b,c,chunk) \
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private(i,tid) \
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private(i,tid) \
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schedule(static,chunk) \
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schedule(static,chunk) \
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firstprivate(first_time)
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firstprivate(first_time)
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for (i=0; i < N; i++)
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for (i=0; i < N; i++)
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{
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{
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if (first_time == 'y')
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if (first_time == 'y')
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{
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{
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tid = omp_get_thread_num();
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tid = omp_get_thread_num();
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first_time = 'n';
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first_time = 'n';
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}
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}
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c[i] = a[i] + b[i];
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c[i] = a[i] + b[i];
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printf("tid= %d i= %d c[i]= %f\n", tid, i, c[i]);
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printf("tid= %d i= %d c[i]= %f\n", tid, i, c[i]);
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}
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}
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return 0;
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return 0;
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}
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}
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