xinu: Desktop/xinu_mips-1.0.2.tar/xinu_mips-1.0.2/system/wakeup.c Source File

00001 
00007 /* Embedded XINU, Copyright (C) 2007.  All rights reserved. */
00008 
00009 #include <kernel.h>
00010 #include <queue.h>
00011 #include <clock.h>
00012 
00016 void wakeup(void)
00017 {
00018         /* wakeup all processes that have no more time to sleep */
00019         while ( nonempty(sleepq) && (firstkey(sleepq) <= 0) )
00020         {
00021                 /* prepare the process, but we need to wake up all       */
00022                 /* processes (possibly more important) which have lapsed */
00023                 ready(dequeue(sleepq), RESCHED_NO);
00024         }
00025 
00026         /* All timed out processes are awake, a now awake process    */
00027         /* may be more important than the currently running process  */
00028         /* so we need a forced reschedule.                           */
00029         resched();
00030         return;
00031 }