[WinAPI] How to make a timer or Interrupt?

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Dear all,

I want to make a timer to schedule a task. I intend make a loop forever and get time by GetLocalTime as:

C++

while(1)
{
   LPSYSTEMTIME time;
   GetLocalTime(&time);
   if(time.wHour == 10)
   {
       //do some tasks
   }
   
}

However, I realize above code will make CPU always busy because of while(1). So there is any method to schedule to carry out specified task without "while(1)" to check. For ex: Interrupt, when local time is 10h, there is an interrupt to wake up my code?

Thank your for you comments

Posted 26-Nov-11 16:01pm

SVPro

Updated 26-Nov-11 16:02pm

v2

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Sergey Alexandrovich Kryukov 26-Nov-11 23:01pm

Why not just using one of system timers? You cannot make your own anyway...
--SA

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Sergey Alexandrovich Kryukov · Accepted Answer · 2011-11-26T17:00:00

You cannot make a true timer without using timer features of OS. A timer is always an OS feature. It uses hardware and a device driver to trigger some event/message at desired time using zero CPU time while waiting for a timer event. Application-level code does not get direct access to hardware and hardware interrupts, so no matter what you do, it's useless.

In Windows, there is a number of different timers you can use. For further information, please see this CodeProject article: Timers Tutorial[^].

—SA