code/pthread/example.c

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

struct fibo {
    int limit;
    int answer;
};

int fib(int n)
{
    int i = 0;
    if (n == 1 || n == 0)
	return 1;
    for (i = 0; i < n; i++) {
	return (fib(n - 1) + fib(n - 2));
    }
    return (-1);
}

void *runner1(void *arg)
{
    struct fibo *fibl = (struct fibo *) arg;
    fibl->answer = fib(fibl->limit);
    pthread_exit(0);
}

int main(int argc, char **argv)
{

    int i;
    pthread_t id[argc];
    pthread_attr_t attr;
    struct fibo d[argc];

    if (argc < 2) {
	printf("usage: %s num1 num2 num3... numN", argv[0]);
	return (1);
    }



    pthread_attr_init(&attr);
    for (i = 1; i < argc; i++) {
	d[i - 1].limit = atoi(argv[i]);
	d[i - 1].answer = 0;
	pthread_create(&id[i - 1], &attr, runner1, &d[i - 1]);
    }

    for (i = 0; i < argc - 1; i++) {
	pthread_join(id[i], NULL);
	printf("\n\nFib of limit: %d is %d", d[i].limit, d[i].answer);
    }

    return (0);

}