CPU_IDLE(9)            NetBSD Kernel Developer's Manual            CPU_IDLE(9)

NAME
     cpu_idle -- machine-dependent processor idling interface

SYNOPSIS
     #include <sys/cpu.h>

     void
     cpu_idle(void);

DESCRIPTION
     cpu_idle() is called by machine-independent code when the processor has
     nothing to do.  It can be used to conserve the processor power, for exam-
     ple.

     cpu_idle() returns immediately if cpu_need_resched() has been called for
     the processor after the last call of cpu_idle() or cpu_did_resched() on
     the processor.  cpu_idle() returns as soon as possible when
     cpu_need_resched() is called for the processor.  Otherwise, it returns
     whenever it likes.

     cpu_idle() is called at IPL_NONE, without any locks held.

EXAMPLES
     The simplest (and, in some cases, the best) implementation of cpu_idle()
     is the following.

             void
             cpu_idle(void)
             {
                     /* nothing */
             }

SEE ALSO
     cpu_need_resched(9), cpu_switchto(9), intro(9), spl(9)

NetBSD 5.0_STABLE               April 20, 2007               NetBSD 5.0_STABLE
