Multiple threads, Dos APP, manage windows

I'm a student at C programming, I need some help (teacher cannot help me now) with an idea I had.
Basically, I wanted to show bottom screen current date / time in any program, I made a thread but I see, i.e., that when I'm listing some files, (too much printf) they appear on my bottom screen instead of normal screen. What I've tried atm is:

Code:

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//Some includes
int _FLAG_TIME_DONE

void time_thread() //with his params (doesn't mind here)
{
//code

int x=wherex();
int y=wherey();
gotoxy(1,24);
printf("%s",time_string);
gotoxy(x,y);
//this way usually main thread writes text on 1,24 or after %s string

/*another idea I had */
int x=wherex();
int y=wherey();
_FLAG_TIME_DONE=1;
gotoxy(1,24);
printf("%s",time_string);
gotoxy(x,y);
_FLAG_TIME_DONE=0;

}

main()
{
//code
for(int i=0;i<20;i++) {
printf("This is a line"); getch;
while(_FLAG_TIME_DONE); //it should pause it until x,y are back on main window..
} //next step

}

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That while is to stop main till thread puts back cursor x,y on origin coords, but it's flagged to low time that it never goes out of it -sigh-

I don't really understand your question, but look my example, I print a message correctly, also, print a msg that will emulate your clock.

Code:

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#include <stdio.h>
#include <conio.h>

#define CLOCK_X 1
#define CLOCK_Y 24

void putmsg( char *msg ) {
        int xtmp, ytmp;

        xtmp = wherex();
        ytmp = wherey()+1;

        puts( msg );
        gotoxy( CLOCK_X,CLOCK_Y );
        printf( "2:33" ); /* here you should print your clock */
        gotoxy(xtmp,ytmp);
        return;
}

int main( void ) {
        putmsg("lala");
        putmsg("lele");
        putmsg("lili");
        putmsg("lolo");
        return 0;
}

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