IIRC, PERL_DESTRUCTOR_LEVEL is a #define that sets how many passes perl makes at trying to destroy things in order when the interpreter ends normaly, before destroying things out of order (or just killing them -- I don't recall which).

Strangely, google and perldoc.com don't show any hits for PERL_DESTRUCTOR_LEVEL -- try greping the perl source for it, and reading nearby comments.

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