otherq(9f) - osol9

1OTHERQ(9F)               Kernel Functions for Drivers               OTHERQ(9F)
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NAME

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

9       #include <sys/stream.h>
10       #include <sys/ddi.h>
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14       queue_t *OTHERQ(queue_t *q);
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INTERFACE LEVEL

18       Architecture independent level 1 (DDI/DKI).
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PARAMETERS

21       q    Pointer to the queue.
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DESCRIPTION

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

30       The OTHERQ() function returns a pointer to a queue's partner.
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CONTEXT

33       The  OTHERQ()  function  can  be called from user, interrupt, or kernel
34       context.
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EXAMPLES

37       Example 1 Setting Queues
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40       This routine sets the minimum packet size, the maximum packet size, the
41       high  water  mark, and the low water mark for the read and write queues
42       of a given module or driver. It is passed either  one  of  the  queues.
43       This  could  be  used  if a module or driver wished to update its queue
44       parameters dynamically.
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47          1  void
48          2  set_q_params(q, min, max, hi, lo)
49          3      queue_t *q;
50          4      short min;
51          5      short max;
52          6      ushort_t hi;
53          7      ushort_t lo;
54          8  {
55          9           q->q_minpsz = min;
56         10           q->q_maxpsz = max;
57         11           q->q_hiwat = hi;
58         12             q->q_lowat = lo;
59         13           OTHERQ(q)->q_minpsz = min;
60         14           OTHERQ(q)->q_maxpsz = max;
61         15           OTHERQ(q)->q_hiwat = hi;
62         16           OTHERQ(q)->q_lowat = lo;
63         17  }
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