otherq(9F)

NAME

     OTHERQ, otherq - get pointer to queue's partner queue

SYNOPSIS

     #include <sys/stream.h>
     #include <sys/ddi.h>

     queue_t *OTHERQ(queue_t *q);

INTERFACE LEVEL

     Architecture independent level 1 (DDI/DKI).

PARAMETERS

     q     Pointer to the queue.

DESCRIPTION

     The OTHERQ() function returns a pointer to the other of  the
     two  queue  structures  that  make  up  a  STREAMS module or
     driver.  If q points to the read queue the write queue  will
     be returned, and vice versa.

RETURN VALUES

     OTHERQ() returns a pointer to a queue's partner.

CONTEXT

     OTHERQ() can be called from user or interrupt context.

EXAMPLES

     Example 1: Setting Queues

     This routine sets  the  minimum  packet  size,  the  maximum
     packet size, the high water mark, and the low water mark for
     the read and write queues of a given module or driver. It is
     passed  either  one  of the queues.  This could be used if a
     module or driver  wished  to  update  its  queue  parameters
     dynamically.

      1  void
      2  set_q_params(q, min, max, hi, lo)
      3      queue_t *q;
      4      short min;
      5      short max;
      6      ushort_t hi;
      7      ushort_t lo;
      8  {
      9           q->q_minpsz = min;
     10           q->q_maxpsz = max;
     11           q->q_hiwat = hi;
     12             q->q_lowat = lo;
     13           OTHERQ(q)->q_minpsz = min;
     14           OTHERQ(q)->q_maxpsz = max;
     15           OTHERQ(q)->q_hiwat = hi;
     16           OTHERQ(q)->q_lowat = lo;
     17  }

SEE ALSO

     Writing Device Drivers

     STREAMS Programming Guide