i386/junos/MIT/course/src/src.lab/user/idle.c

   1 // idle loop
   2
   3 #include <inc/x86.h>
   4 #include <inc/lib.h>
   5
   6 void
   7 umain(int argc, char **argv)
   8 {
   9         binaryname = "idle";
  10
  11         // Loop forever, simply trying to yield to a different environment.
  12         // Instead of busy-waiting like this,
  13         // a better way would be to use the processor's HLT instruction
  14         // to cause the processor to stop executing until the next interrupt -
  15         // doing so allows the processor to conserve power more effectively.
  16         while (1) {
  17                 sys_yield();
  18         }
  19 }
  20