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Reserving a session for a conversation z/OS Communications Server: SNA Programmer's LU 6.2 Guide SC27-3669-00 |
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An application program can obtain information about a conversation before initiating the conversation by issuing the APPCCMD CONTROL=PREALLOC macroinstruction. This puts the conversation in PENDING_ALLOCATE state. VTAM® returns a conversation identifier (CONVID) and related information for the pending conversation. VTAM may also return information
in the VTAM-APPCCMD vector list, which can be requested by the application
by specifying a vector list area (VTRINA) and the length of that area
(VTRINL) on an APPCCMD macroinstruction. Applications should examine
the VTAM-APPCCMD vector list when using any of the following functions:
The application can also obtain other information about the conversation from VTAM-APPCCMD vector list. SeeVector lists used during APPCCMD processing for more information. To establish a conversation reserved by the APPCCMD CONTROL=PREALLOC
macroinstruction, the application issues the APPCCMD CONTROL=SENDFMH5
macroinstruction specifying the CONVID of the pending conversation.
This places the FMH-5 in the SEND buffer destined for the partner
LU. For conversations whose preallocated sessions are full-duplex-capable,
the FMH-5 is not buffered, but sent immediately. For conversations
whose preallocated sessions are half-duplex-capable, the FMH-5 is
not sent until one of the following conditions occurs:
The application program uses the AREA parameter on the macroinstruction to point to the FMH-5. The RECLEN parameter specifies the length of the FMH-5. On the APPCCMD CONTROL=PREALLOC macroinstruction, applications can specify any of the QUALIFY values that are available for the APPCCMD CONTROL=ALLOC macroinstruction. See Table 1 for more information about these QUALIFY values. To deallocate a conversation reserved by the APPCCMD CONTROL=PREALLOC
macroinstruction, use one of the following macroinstructions:
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