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Threadsafe Considerations for CICS by John Tilling, Peter Klein, Em James, Philip Hale, George Bogner, Chris Rayns

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Overview of an open transaction environment and threadsafe applications
This chapter addresses the following program types (definitions) in CICS:
Quasi-reentrant (QR)
Threadsafe:
 – CICSAPI
 – OPENAPI
Required:
 – CICSAPI
 – OPENAPI
This chapter explains what determines each type, how to define the associated program definition, and the requirements CICS expects of each type. It examines the history of the open transaction environment (OTE) in CICS and the relationship of OTE to open task control blocks (TCBs), task-related user exits (TRUEs), ...

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