#ifndef STENCIL_H
#define STENCIL_H

#include <semaphore.h>

#define NB_THREADS 4

#define N 50			/* matrix size */

#define NB_STEPS 20		/* number of iterations */



struct shared_memory_t {
  double cur_step[N*N];
  double next_step[N*N];
  sem_t step_produced;
  sem_t step_consumed;
};


#define SHM_SIZE sizeof(struct shared_memory_t)
#define KEY "/key_stencil"


/* access tab[i][j] if tab is a 1-D array */
#define GET(tab, i, j) (tab[ ( (i) * N ) + (j)])


void compute_boundaries(int *i_min, int *i_max, int *j_min, int *j_max, int nb_threads, int my_id);

void print_matrix(double* matrix);

#define GET_TIME(t) gettimeofday(&(t), NULL)

/* time difference in micro seconds */
#define TIME_DIFF(t1, t2) ((t2.tv_sec-t1.tv_sec)*1e6 + (t2.tv_usec - t1.tv_usec))/1e6


#endif	/* TOOLS_H */