Synchronous and Asynchronous Processing

          POST_ON_RECEIPT

          WAIT RESOURCE_LIST

The statements used to establish SNA sessions and to exchange data can be issued as either synchronous or asynchronous requests.

Note: For more information about synchronous and asynchronous processing, see the #TREQ.

When establishing a conversation you can request:

Synchronous processing by using the OPTNS=WAIT parameter of the #TREQ ALLOC statement.
Asynchronous processing by using #TREQ ALLOC,OPTNS=NOWAIT. You must issue a #TREQ CHECK, specifying the LTE address of the remote LU, prior to any other I/O requests for that conversation.

Note: For more information about the #TREQ ALLOC statement, the Allocating a Session in this appendix.

When you are issuing #TREQ input and output statements, you can request:

Synchronous processing by using #TREQ GET, PUT, and PUTGET.
Asynchronous processing by using #TREQ WRITE, READ, and WRITREAD. The #WAIT statement is used to wait on an ECB list. All asynchronous requests must be followed by a #TREQ CHECK statement before any other I/O requests can be made for that session.