Question

I am novice in process/task management.
I would like to schedule two tasks.
suppose,

fun1()  
{  
    printf("It will be printed in every 1 min \n");  
}  
fun2()  
{  
    printf("It will be printed in every 2 min \n");  
}  
main()  
{  
    fun1();  
    fun2();  
}

So how to schedule them, so that I will get my desired output.

I want it to run in Code::Blocks (Windows).
I want fun1 to run 1 min and fun2 to run every 2 mins.
If I can do it in two separate process also then tell me how can I do it.
Do I need to use semaphore, mutex and all?

Answer 1

Your example is trivial and can be scheduled without resorting to any OS provided scheduling or even OS timing services, however in general (for non-trivial requirements) in Windows, you would use multi-threading and allow the OS to perform the scheduling. main() is already a thread, so you only need create one other. In its simplest form:

#include <stdio.h>
#include <windows.h>

DWORD WINAPI OneMinthread( LPVOID lpParam ) 
{  
    for(;;)
    {
        printf("It will be printed in every 1 min \n");  
        Sleep(60000) ;
    }
}  

int main()  
{  
    CreateThread( NULL, 0, OneMinthread, 0, 0, 0) ;
    for(;;)
    {
        printf("It will be printed in every 2 min \n");  
        Sleep(120000) ;
    }
}  

See Creating Threads for a more complete treatment of threading in Win32. Be aware that the .Net framework also provides a simpler class based interface to threading.