HP 800 ACSE/Presentation and ROSE Interface Programmer's Guide - Page 42

Step 4: Release the Association

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Using ACSE/Presentation Step 4: Release the Association Figure 3-9 Step 4: Release the Association Processes must cooperate to ensure that no data is lost when the association is released. This can be accomplished by requesting a release, accepting the release, then terminating the association. Requesting the Release After Process A has completed sending user data, it sends a release request to Process B using ap_snd() with the A_RELEASE_REQ primitive (Figure 9). Process B uses ap_poll() to monitor events, and calls ap_rcv() to receive the release request. Release Request Process A Process B AP Environment A AP Environment B Initiator Communication Endpoint A ap_snd() release request Responder Communication Endpoint B ap_poll() ap_rcv() Confirm the Release Request Process B accepts the request and sends a positive response using the ap_snd() call with the A_RELEASE_RSP primitive (Figure 3-10). 42 Chapter 3

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42
Chapter 3
Using ACSE/Presentation
Step 4: Release the Association
Step 4: Release the Association
Processes must cooperate to ensure that no data is lost when the
association is released. This can be accomplished by requesting a release,
accepting the release, then terminating the association.
Requesting the Release
After Process A has completed sending user data, it sends a release
request to Process B using ap_snd() with the A_RELEASE_REQ
primitive (Figure 9).
Process B uses ap_poll() to monitor events, and calls ap_rcv() to receive
the release request.
Figure 3-9
Release Request
Confirm the Release Request
Process B accepts the request and sends a positive response using the
ap_snd() call with the A_RELEASE_RSP primitive (Figure 3-10).
Communication
Communication
Endpoint A
Endpoint B
Process A
Process B
AP Environment A
AP Environment B
Initiator
Responder
ap_snd()
ap_poll()
ap_rcv()
release request