LISTING 2. Creates a single thread that prints simultaneously while the Primary thread prints.
// INCLUDES ////////////////////////////////////////////////////////////

#define WIN32_LEAN_AND_MEAN  // make sure certain headers are included correctly

#include <windows.h>         // include the standard windows stuff
#include <windowsx.h>        // include the 32 bit stuff
#include <conio.h>
#include <stdlib.h>
#include <stdarg.h>
#include <stdio.h>
#include <math.h>
#include <io.h>
#include <fcntl.h>

// DEFINES ////////////////////////////////////////////////////////////////


// PROTOTYPES ////////////////////////////////////////////////////////////

DWORD WINAPI Printer_Thread(LPVOID data);

// GLOBALS /////////////////////////////////////////////////////////////////


// FUNCTIONS ///////////////////////////////////////////////////////////////

DWORD WINAPI Printer_Thread(LPVOID data)
{
// this thread function simply prints out data 25 times with a slight delay

for (int index=0; index<25; index++)
	{
	printf("%d ",data); // output a single character
	Sleep(100);         // sleep a little to slow things down
	} // end for index


// just return the data sent to the thread function

return((DWORD)data);

} // end Printer_Thread

// MAIN ////////////////////////////////////////////////////////////////////

void main(void)
{
HANDLE thread_handle;  // this is the handle to the thread
DWORD  thread_id;      // this is the id of the thread

// start with a blank line

printf("\nStarting threads...\n");

// create the thread, IRL we would check for errors

thread_handle = CreateThread(NULL,                   // default security
		          0,	                  // default stack 
		          Printer_Thread,  // use this thread function
		          (LPVOID)1,          // user data sent to thread
		          0,	                 // creation flags, 0=start now.
		          &thread_id);        // send id back in this var

// now enter into printing loop, make sure this takes longer than thread,
// so thread finishs first

for (int index=0; index<50; index++)
	{
	printf("2 ");
	Sleep(100);
	} // end for index

// at this point the thread should be dead

CloseHandle(thread_handle);

// end with a blank line

printf("\nAll threads terminated.\n");

} // end main

Sample output:

Starting threads...
2 1 2 1 2 1 2 1 1 2 2 1 1 2 2 1 1 2 2 1 1 2 2 1 1 2 2 1 1 2 2 1 1 2 2 1 1 2 2 1 1 2 2 1 1 2 2 1 1 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 2 
All threads terminated.