SCR/SCR3.1/TP6/max.c

#include <unistd.h>
#include <assert.h>
#include <stdio.h>
#include <stdlib.h>
#include <pthread.h>

struct numbers {
	int n1;
	int n2;
	int max;
};

typedef struct numbers numbers;

void * max(void * n){
	numbers *comp = (numbers *) n;
	if (comp->n1 > comp->n2)
		comp->max = comp->n1;
	else
		comp->max = comp->n2;
}

int main(int argc, char **argv){
	if (argc != 9){
		printf("Usage : %s <n1> <n2> <n3> <n4> <n5> <n6> <n7> <n8>\n", argv[0]);
		return EXIT_FAILURE;
	}
	pthread_t threads[4];
	numbers duels[4];
	for(int i = 0; i < 4; i++){
		duels[i].n1 = (int) strtod(argv[2*i+1], NULL);
		duels[i].n2 = (int) strtod(argv[2*(i+1)], NULL);
		duels[i].max = 0;
		pthread_create(&threads[i], NULL, max, (void*) (duels + i));
	}
	for (int i = 0; i < 4; i++){
		pthread_join(threads[i], NULL);
	}
	numbers demi_f[2];
	for (int i = 0;i < 2; i++){
		demi_f[i].n1 = duels[i*2].max;
		demi_f[i].n2 = duels[i*2+1].max;
		demi_f[i].max = 0;
		pthread_create(&threads[i], NULL, max, (void*) (demi_f + i));
	}
	for (int i = 0; i < 2;i++){
		pthread_join(threads[i], NULL);
	}

	numbers finale = {};
	finale.n1 = demi_f[0].max;
	finale.n2 = demi_f[1].max;
	pthread_create(&threads[0], NULL, max, (void*) (&finale));
	pthread_join(threads[0], NULL);
	printf("Le plus grand des huits nombres est : %d\n", finale.max);
	return EXIT_SUCCESS;
}