#include <stdio.h>
#include "ul_threads.h"

void busywait(unsigned int n)
{
	for (; n > 0; n--); 
}

void func_a(int id){
	int i = 0;
	for( ; i <50; i++){
		printf(" -=A%d=- ", getid());
		busywait(0x1FFFFF);
	}
	
	finish_thread(id);
}

void func_b(int id){
	int i = 0;
	for( ; i <50; i++){
		printf(" -=B%d=- ", getid());
		busywait(0x1FFFFF);
	}
	finish_thread(id);
}

void func_c(int id){
	int i = 0;
	for( ; i <10; i++){
		printf(" -=C%d=- ", getid());
		yield();
	}
	finish_thread(id);
}

int main()
{
	printf("User-level Threads Scheduler\n");
	setvbuf(stdout, 0, _IONBF, BUFSIZ);

	init();
	
	printf("Hello! I'm the main thread, my ID is %d.\n", getid());
	printf("Now I`ll create another 3 threads and wait their jobs finish!\n");
	
	int thrA = create(&func_a, 1979);
	int thrB = create(&func_b, 2008);
	int thrC = create(&func_c, 29);
	
	int retA, retB, retC;
	
	join(thrB, &retB);
	join(thrA, &retA);
	join(thrC, &retC);
	
	printf("\n\n");
	printf("Thread A returned %d\n", retA);
	printf("Thread B returned %d\n", retB);
	printf("Thread C returned %d\n", retC);
	
	printf("I`m also done ! Bye ...\n");

	return 0;
}