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/* -*- c-file-style: "GNU" -*- */
/*
* Copyright (C) CNRS, INRIA, Université Bordeaux 1, Télécom SudParis
* See COPYING in top-level directory.
*/
# include <stdlib.h>
# include <stdio.h>
# include <time.h>
# include <omp.h>
#include <stdarg.h>
// Debugging part, print out only if debugging level of the system is verbose or more
int _debug = -77;
void debug(const char *fmt, ...) {
if (_debug == -77) {
char *buf = getenv("EZTRACE_DEBUG");
if (buf == NULL)
_debug = 0;
else
_debug = atoi(buf);
}
if (_debug >= 0) { // debug verbose mode
va_list va;
va_start(va, fmt);
vfprintf(stdout, fmt, va);
va_end(va);
}
}
// end of debugging part
#define SIZE (1024*1024*8)
int main(void) {
int i;
int *A = malloc(sizeof(int) * SIZE);
int *B = malloc(sizeof(int) * SIZE);
int *C = malloc(sizeof(int) * SIZE);
for (i = 0; i < SIZE; i++) {
A[i] = i * 17 % 7;
B[i] = i * 19 % 7;
C[i] = 0;
}
omp_lock_t lock;
omp_init_lock(&lock);
int somme = 0;
//compute for real!
int j;
omp_set_num_threads(4);
for (j = 0; j < 1; j++) {
debug("loop %d\n", j);
debug("\trunning parallel for schedule(static)\n");
#pragma omp parallel for
for (i = 0; i < SIZE; i++) {
C[i] = A[i] + B[i];
if (i % 1000 == 0) {
omp_set_lock(&lock);
somme += C[i];
omp_unset_lock(&lock);
}
}
}
printf("somme = %d\n", somme);
return 0;
}
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