gistfile1.txt

#include <pthread.h>

static int go;
static int should_exit;

void *ctr(void *p) {
        int *counter = p;

        for (;;) {
                if (__atomic_load_n(&go, __ATOMIC_RELAXED))
                        break;
        }
        for (;;) {
                if (__atomic_load_n(&should_exit, __ATOMIC_RELAXED))
                        break;
                *counter = *counter + 1;
        }
}

int main(int argc, char *argv[]) {
        int i, n;
        int *counters;
        pthread_t *threads;

        i = atoi(argv[1]);
        counters = calloc(sizeof(int), i);
        threads = calloc(sizeof(pthread_t), i);

        for (n = 0; n < i; n++) {
                pthread_create(&threads[n], NULL, ctr, &counters[n]);
        }
        __atomic_store_n(&go, 1, __ATOMIC_RELAXED);
        sleep(1);
        __atomic_store_n(&should_exit, 1, __ATOMIC_RELAXED);
        for (n = 0; n < i; n++) {
                pthread_join(threads[n], NULL);
        }
        for (n = 0; n < i; n++) {
                printf("%d: %d\n", n, counters[n]);
        }
}