DESCRIPTION

     The wake_up function is  the  opposite  of  the  sleep_on(9)
     function  in  that  it  awakens  processes that have gone to
     sleep using the same condition variable. All  the  processes
     sleeping  on  the given condition are awakened. If there are
     no processes  sleeping  on  the  condition,  then  none  are
     affected.

     Unlike the sleep_on(9) function, wake_up does not block  and
     may be called by interrupt handlers. It is in fact the prin-
     ciple means of synchronizing with interrupt events.

     If  the  condition  parameter  is  NULL,  or  there  are  no
     processes  sleeping  on  condition, the call to wake_up is a
     no-op.

RETURN VALUE

     None.

AVAILABILITY

     Linux 1+

SEE ALSO

     sleep_on(9)

     /usr/src/linux/kernel/sched.c

AUTHOR

     Stephen Williams <steve@icarus.com>

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