Data Structures for Drivers                             qband(9S)



NAME
     qband - STREAMS queue flow control information structure

SYNOPSIS
     #include 


INTERFACE LEVEL
     Architecture independent level 1 (DI/DKI)

DESCRIPTION
     The  qband structure contains flow control  information  for
     each priority band in a queue.


     The qband structure is defined as type qbandt.

STRUCTURE MEMBERS
       struct        qband*qbnext;     /* next band's info */
       sizet        qbcount           /* number of bytes in band */
       struct msgb   *qbfirst;         /* start of band's data */
       struct msgb   *qblast;          /* end of band's data */
       sizet        qbhiwat;          /* band's high water mark */
       sizet        qblowat;          /* band's low water mark */
       uintt        qbflag;           /* see below */



     Valid flags are as follows:

     QBFUL      Band is considered full.


     QBWANTW     Someone wants to write to band.


SEE ALSO
     strqget(9F), strqset(9F), msgb(9S), queue(9S)


     STREAMS Programming Guide

NOTES
     All access to this structure should be  through  strqget(9F)
     and  strqset(9F).  It is logically part of the queue(9S) and
     its layout and partitioning with respect to  that  structure
     might  change  in  future releases. If portability is a con-
     cern, do not declare or store instances of or references  to
     this structure.






SunOS 5.11          Last change: 14 Nov 1996                    1