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Full Discussion: Stream Read And Write Queues
Top Forums UNIX for Advanced & Expert Users Stream Read And Write Queues Post 21883 by S.P.Prasad on Friday 24th of May 2002 01:05:50 AM
Old 05-24-2002
Sir, I am referring SCO Streams Runtime Systems Release and Installation Notes Manual - Streams Programmers Guide.

The diagram, which I have designed in my previous message, exists in Chapter 5 page 3.

Sir, could you explain me some basics concepts of Streams Scheduler with reference to queues. What is a Scheduling queue?

I found out that the q_link member of queue_t structure actually holds link to the queue scheduler. Kindly explain the scheduling operations.
 

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LEARN ABOUT XFREE86

rd

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

NAME

       RD, rd - get pointer to the read queue

SYNOPSIS

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

       queue_t *RD(queue_t *q);

INTERFACE LEVEL

       Architecture independent level 1 (DDI/DKI).

PARAMETERS

       q	Pointer to the write queue whose read queue is to be returned.

DESCRIPTION

       The RD() function accepts a write queue pointer as an argument and returns a pointer to the read queue of the same module.

       CAUTION:  Make  sure  the  argument  to this function is a pointer to a write queue. RD() will not check for queue type, and a system panic
       could result if it is not the right type.

RETURN VALUES

       The pointer to the read queue.

CONTEXT

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

EXAMPLES

       Example 1: Function page reference

       See the qreply(9F) function page for an example of RD().

SEE ALSO

       qreply(9F), WR(9F)

       Writing Device Drivers

	STREAMS Programming Guide

SunOS 5.10							    15 Nov 1991 							    RD(9F)
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