music-brainz-go/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);

}