4.2.7 Restricting tracing

:process

Trace keyword

:process process

This lets you restrict tracing of a function to a particular process. If process evaluates tot, then the function is traced from within all processes (this is the default). Otherwise, the function is only traced from within the process that process evaluates to.

:when

Trace keyword

:when form

This lets you invoke the tracing facilities on a traced function selectively. Before each call to the function, form is evaluated. If form evaluates tonil, no tracing is done. The contents of hcl:*traced-arglist* can be examined by form to find the arguments given to trace.

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LispWorks User Guide - 14 Oct 1998

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