cpu_idle(9) - NetBSD Manual Pages

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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 5.1.2                    April 20, 2007                    NetBSD 5.1.2