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NAME

bcanput - test for flow control in
specified priority band
 

SYNOPSIS

#include <sys/stream.h>



int bcanput(queue_t *q, unsigned char pri);

INTERFACE LEVEL

Architecture independent level 1 (DDI/DKI).  

PARAMETERS

q

Pointer to the message queue.

pri

Message priority.

DESCRIPTION

The bcanput() function searches through the stream (starting at q) until it finds a queue containing a service routine where the message can be enqueued, or until it reaches the end of the stream. If found, the queue containing the service routine is tested to see if there is room for a message of priority pri in the queue.

If pri is 0, bcanput() is equivalent to a call with canput(9F).

canputnext(q) and bcanputnext(q,pri) should always be used in preference to canput(q->q_next) and bcanput(q->q_next,pri) respectively.  

RETURN VALUES

1

If a message of priority pri can be placed on the queue.

0

If the priority band is full.

CONTEXT

The bcanput() function can be called from user, interrupt, or kernel context.  

SEE ALSO

bcanputnext(9F), canput(9F), canputnext(9F), putbq(9F), putnext(9F)

Writing Device Drivers

STREAMS Programming Guide  

WARNINGS

Drivers are responsible for both testing a queue with bcanput() and refraining from placing a message on the queue if bcanput() fails.

Index

NAME

SYNOPSIS

INTERFACE LEVEL

PARAMETERS

DESCRIPTION

RETURN VALUES

CONTEXT

SEE ALSO

WARNINGS

Партнёры:

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