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1 /******************************************************************************
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2 * OpenMP Example - Combined Parallel Loop Work-sharing - C/C++ Version
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3 * FILE: omp_workshare4.c
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4 * DESCRIPTION:
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5 * This is a corrected version of the omp_workshare3.c example. Corrections
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6 * include removing all statements between the parallel for construct and
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7 * the actual for loop, and introducing logic to preserve the ability to
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8 * query a thread's id and print it from inside the for loop.
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9 * SOURCE: Blaise Barney 5/99
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10 * LAST REVISED: 03/03/2002
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11 ******************************************************************************/
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12
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13 #include <omp.h>
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14 #include <stdio.h>
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15 #define N 50
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16 #define CHUNKSIZE 5
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17
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18 main () {
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19
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20 int i, chunk, tid;
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21 float a[N], b[N], c[N];
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22 char first_time;
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23
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24 /* Some initializations */
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25 for (i=0; i < N; i++)
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26 a[i] = b[i] = i * 1.0;
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27 chunk = CHUNKSIZE;
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28 first_time = 'y';
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29
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30 #pragma omp parallel for \
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31 shared(a,b,c,chunk) \
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32 private(i,tid) \
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33 schedule(static,chunk) \
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34 firstprivate(first_time)
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35
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36 for (i=0; i < N; i++)
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37 {
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38 if (first_time == 'y')
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39 {
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40 tid = omp_get_thread_num();
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41 first_time = 'n';
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42 }
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43 c[i] = a[i] + b[i];
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44 printf("tid= %d i= %d c[i]= %f\n", tid, i, c[i]);
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45 }
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46
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47 return 0;
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48 }
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