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Status-Resource

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The Status-Resource message is used to provide a simple flow control mechanism between the local node and the application to prevent the application from exhausting its resources. It flows from the application to the node, and is used with a primary logical unit (PLU) connection.

It is only used on the PLU connection where the application specifies in the PLU connection information control block (CICB) that pacing requires application participation. For further details, see Pacing and Chunking.

Syntax

  
struct Status-Resource {  
    PTRBFHDR  nxtqptr;  
    PTRBFELT  hdreptr;  
    CHAR      numelts;  
    CHAR      msgtype;  
    CHAR      srcl;  
    CHAR      srcp;  
    INTEGER   srci;  
    CHAR      destl;  
    CHAR      destp;  
    INTEGER   desti;  
    CHAR      sfhdr.streshdr.resstat;  
    CHAR      sfhdr.streshdr.respad;  
    CHAR      sfhdr.streshdr.rescred;  
};

Members

nxtqptr
Pointer to next buffer header.

hdreptr
Pointer to buffer element (NIL).

numelts
Number of buffer elements (0x00).

msgtype
Message type STATFMI (0x21).

srcl
Source locality.

srcp
Source partner.

srci
Source index.

destl
Destination locality.

destp
Destination partner.

desti
Destination index.

sfhdr.streshdr.resstat
Status type STRESRCE (0x04).

sfhdr.streshdr.respad
Reserved.

sfhdr.streshdr.rescred
Application credit.

Remarks

  • The Status-Resource message consists of a buffer header only. There is no buffer element.

  • The rescred (application credit) field indicates that the application can receive further credit request/response units (RUs) of the maximum RU size, or further credit chunks if chunking is being used.