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

typedef struct structure{
    int debut;
    int fin;
    int saut;
    int* resultat;
}  structure;

static inline double tstamp(void)
{
    struct timespec tv;
    clock_gettime(CLOCK_REALTIME, &tv);
    return tv.tv_sec + tv.tv_nsec * 1.0e-9;
}


void *somme(void *argument) {
    structure data = *((structure *) argument);
    for (; data.debut<=data.fin; data.debut += data.saut){
        *data.resultat += data.debut;
    }
    return NULL;
}

int main(int argc, char* argv[]) {
    assert(argc-1 == 2);
    int limite = (int) strtol(argv[1], NULL, 0);
    int nbThread = (int) strtol(argv[2], NULL, 0);
    int sommeFinal = 0;
    double startTime, endTime;
    int resultatThread[nbThread];
    pthread_t threads[nbThread];
    structure argument[nbThread];

    for (int i = 0; i < nbThread; i++){
        argument[i].debut = i;
        argument[i].fin = limite;
        argument[i].saut = nbThread;
        resultatThread[i] = 0;
        argument[i].resultat = &resultatThread[i];
    }
    startTime = tstamp();
    for (int i = 0; i < nbThread; i++){
        assert( pthread_create(&threads[i], NULL, somme, &argument[i]) == 0);
    }

    for (int i = 0; i < nbThread; i++){
        assert( pthread_join(threads[i], NULL) == 0);
        sommeFinal += *argument[i].resultat;
    }
    endTime = tstamp();
    printf("somme : %d\ntemps : %lf\n", sommeFinal, endTime-startTime);

    return EXIT_SUCCESS;
}