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select_wakeup(9r)
NAME
  select_wakeup - General: Wakes up a kernel thread

SYNOPSIS
  void select_wakeup(
	  sel_queue_t *selq );

ARGUMENTS
  selq
      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 suspended 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 (typically
  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)

Index for Section 9r

Alphabetical listing for S

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