scheduler:  set pointer to point to first member in list
                 while RUNNING flag not set {
                     do {    set RUNNING flag
                         if request count > 0 {
                             call function
                             decrement request count
                         }
                         clear RUNNING flag
                     } while request count > 0
                     point to next member in list
                 }
                 return from interrupt

Example 2: Pseudocode for the scheduler.