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Conference ozrock::x25_osf

Title:	Proudly built by the engineers of NaC Australia

Moderator:	DELNI::MUGGERIDGE

Created:	Mon Oct 12 1992
Last Modified:	Fri Jun 06 1997
Last Successful Update:	Fri Jun 06 1997
Number of topics:	908
Total number of notes:	3829

877.0. "Flow control - Application informed of congestion ?" by BIS1::CALLEWAERT () Mon Mar 24 1997 23:47

    My customer wants his applications to be informed that an
    overflow occurs and that sending over the X.25 link is useless.
    
    He looked in the X.25 for DEC/OSF Programming Reference Manual
    (AA-PR2QA-TE) and couldn't find an information on the API
    allowing flow control.
    
    Does flow control happen in layer 3 ?
    If yes, does the application wait during flow control ?
    If no, how is the application made aware of the congestion ?
    
    Thanks,
    
    Rgds,
    
    Jean.

T.R Title User Personal
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877.1 DELNI::MUGGERIDGE Fri Apr 04 1997 02:17 12

T.R	Title	User	Personal Name	Date	Lines
877.1		DELNI::MUGGERIDGE		`Fri Apr 04 1997 02:17`	12
	Hi, Flow control occurs at all levels of the stack. However, to answer your question with regard to the API, the socket layer is responsible for handling this. Eventually, the call to write will block. BTW, there are a variety of ways to do this, but for a simple application, using blocking IO is easiest. Does that answer your question? Matt.

Hi,

Flow control occurs at all levels of the stack.

However, to answer your question with regard to the API, the socket
layer is responsible for handling this.  Eventually, the call to write
will block.  BTW, there are a variety of ways to do this, but for a
simple application, using blocking IO is easiest.

Does that answer your question?

Matt.