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Full Discussion: Stream Read And Write Queues
Top Forums UNIX for Advanced & Expert Users Stream Read And Write Queues Post 21871 by Perderabo on Thursday 23rd of May 2002 07:07:49 PM
Old 05-23-2002
I wanted to refer to my Streams Docs before I answered this. I found the answer in UNIX SYSTEM V RELEASE 4 Programmer's Guide: Streams. On page 3-4 on my book it has the diagram you show together with some qinit stuff.

I suspect that your book may be similiar to mine. My chapter 4 is STREAMS Processing Routines. On page 4-4, the Asynchonous Protocol Stream Example starts. A few pages in I have:
Quote:
CHARPROC causes the echo to be transmitted back to the terminal by first copying the message with a STREAMS utility routine. Then CHARPROC uses another utility routine to obtain the address of its own write queue. Finally, the CHARPROC read put procedure uses another utility routine to call its write put procedure and pass it the message copy.
 

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LEARN ABOUT SUNOS

put

put(9F) 						   Kernel Functions for Drivers 						   put(9F)

NAME

       put - call a STREAMS put procedure

SYNOPSIS

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

       void put(queue_t *q, mblk_t *mp);

INTERFACE LEVEL

       Architecture independent level 1 (DDI/DKI).

PARAMETERS

       q	Pointer to a STREAMS queue.

       mp	Pointer to message block being passed into queue.

DESCRIPTION

       put()  calls the put procedure ( put(9E) entry point) for the STREAMS queue specified by q, passing it the message block referred to by mp.
       It is typically used by a driver or module to call its own put procedure.

CONTEXT

       put() can be called from a STREAMS module or driver put or service routine, or from an associated interrupt handler, timeout,  bufcall,	or
       esballoc call-back. In the latter cases, the calling code must guarantee the validity of the q argument.

       Since  put()  may cause re-entry of the module (as it is intended to do), mutexes or other locks should not be held across calls to it, due
       to the risk of single-party deadlock (put(9E), putnext(9F), putctl(9F), qreply(9F)).  This function is provided	as  a  DDI/DKI	conforming
       replacement for a direct call to a put procedure.

SEE ALSO

       put(9E), freezestr(9F), putctl(9F), putctl1(9F), putnext(9F), putnextctl(9F), putnextctl1(9F), qprocson(9F), qreply(9F)

       Writing Device Drivers

	STREAMS Programming Guide

NOTES

       The caller cannot have the stream frozen when calling this function.  See  freezestr(9F).

       DDI/DKI	conforming  modules  and  drivers  are	no longer permitted to call put procedures directly, but must call through the appropriate
       STREAMS utility function, for example, put(9E), putnext(9F), putctl(9F), and qreply(9F). This function is provided as a DDI/DKI	conforming
       replacement for a direct call to a put procedure.

       The put() and putnext() functions should be called only after qprocson() is finished.

SunOS 5.10							    28 Apr 1992 							   put(9F)
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