source: soft/tp20/correction/main1.c @ 64

#include "stdio.h"

#define NPIXELS         128
#define NLINES          128
#define NORM            46
#define RANGE           9

extern struct plouf NB_PROCS;

int input[NLINES][NPIXELS];
int output[NLINES][NPIXELS];

int kernel[9] = { 1, 2, 4, 8, 16, 8, 4, 2, 1 };

/////////////////////
void filter(int line)
{
    int p;
    int k;
    int x;
    int accu;

    for ( p = 0 ; p < NPIXELS ; p++ )
    {
        accu = 0;
        for ( k = 0 ; k < RANGE ; k++ )
        {
            if          ( (p - k) < 0 )                 x = 0;
            else if     ( (p - k) >= (NPIXELS - 1) )    x = NPIXELS - 1;
            else                                        x = p - k;
            accu += (input[line][x] * kernel[k]);
        }
        output[line][p] = accu/NORM;
    }
}

//////////
int main()
{
    int nb_procs = (int)&NB_PROCS;
    int my_index = procid();
    int time;
    int line;

    tty_printf("processor %d is alive!\n\n", my_index);

    for ( line = 0 ; line < NLINES ; ++line ) 
    {
        if ( (line % nb_procs) == my_index )
        {
            time = proctime();
            tty_printf("processor %d processing line %d at time %d\n", my_index, line, time);
            filter(line);
        }
    }

    tty_printf("\nprocessor %d completed at time %d\n", my_index, time);

    exit();

    return 0;
}