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Status Under review
Workspace z/TPF Product Family
Categories z/TPF
Created by Guest
Created on Jul 12, 2024

RELATED IDEAS

Improve performance of C++ try/catch when exception is thrown

Our coding best practice guidelines advise developers not to use the try-throw-catch method in C++ code for control of the program flow or transaction validation as the underlying TPF mechanism for identifying the source of the thrower results in a noticeable CPU overhead. The technique is reserved for throwing systemic errors, but these guidelines are impossible to enforce, and we still see examples of code that should use if/else or switch/case logic instead.

TPF identifies the address of the thrown exception using a sequential search to match it against addresses in CPS0 link map and the program IPAT and this causes the unwanted CPU overhead.

Suggestion here is to modify that exception address search by first checking the IPAT slot of the current program before embarking on the full sequential search of system tables, judging from our code base this would catch most instances of these exceptions without incurring the CPU overhead of an IPAT search.

Idea priority Low

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