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select_wakeup(9r)					     select_wakeup(9r)

NAME
       select_wakeup - General: Wakes up a kernel thread

SYNOPSIS
       void select_wakeup(
	       sel_queue_t *selq );

ARGUMENTS
       Specifies a pointer to a sel_queue structure.

DESCRIPTION
       The  select_wakeup  routine  wakes up a kernel thread that is suspended
       while waiting for an  event  on	the  specified	device.	 A  user-level
       process	can use the select system call to cause the process to be sus‐
       pended while waiting for an event to happen on a device. For example, a
       graphics application may issue a select call while waiting for mouse or
       keyboard input to arrive. In this case  the  process  would  issue  the
       select  system  call, which would indirectly call the graphics driver's
       select routine (through the driver's select entry point	in  the	 dsent
       table)  to  determine if any input is available. If input is available,
       the select call may return  immediately.	  If  no  input	 is  currently
       available,  the	graphics  driver would suspend the process until input
       arrived.

       For this example, when the graphics driver has  received	 input	(typi‐
       cally through its interrupt handler), it causes any processes suspended
       from calling select to continue by calling the  select_wakeup  routine.
       This  causes  any process currently suspended on the select channel (as
       specified by the selq argument) to resume.

RETURN VALUES
       None

SEE ALSO
       Routines:	  select_dequeue(9r),	       select_dequeue_all(9r),
       select_enqueue(9r)

       System Calls: select(2)

							     select_wakeup(9r)

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