rt_global_sti

["daniel sheltraw" <l5gibson@hotmail.com>]

Hello RTers

A while back a few of you helped with an ISR that looked like this:

void pport1_irq(void){
  rt_global_sti();
  if(lp_count == ctrl[event_num].dat1){
    start_time = rt_get_time();
    rt_task_resume();
  }
  lp_count ++;
}

The ISR resumes a previously suspended task after a certain number of
hardware interrupts are received on the parallel port. You helped
me with this ISR by instructing me that I need the rt_global_sti()
line.

Question: Would someone please tell me why enabling interrupts
          was necessary? There's a gap in my understanding
          that looms.

Thanks once again,
Daniel S.
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