unwind-protect
(MIT) A Lisp operator which evaluates an expression and then, even if that expression causes a non-local exit, evaluates zero or more other expressions. This can be used to ensure that essential "clean-up" operations are performed even in the presence of errors. [Jargon File]Last updated: 1994-11-03
unwind the stack
During the execution of a procedural language, one is said to "unwind the stack" from a called procedure up to a caller when one discards the stack frame and any number of frames above it, popping back up to the level of the given caller. In C this is done with "longjmp"/"setjmp", in Lisp with "throw/catch". See also smash the stack. [Jargon File]Nearby terms:
unswizzle ♦ until ♦ untyped ♦ unwind-protect ♦ unwind the stack ♦ UN*X ♦ unzip
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