[Perl/perl5] 819c46: locale.c,perl.c: Clean up MULTIPLICITY vs USE_THREADS

[Karl Williamson via perl5-changes]

Branch: refs/heads/blead
Home: https://github.com/Perl/perl5
Commit: 819c46dc1a9aa3dc49364b96096e67170ef1c947
https://github.com/Perl/perl5/commit/819c46dc1a9aa3dc49364b96096e67170ef1c947
Author: Karl Williamson <k...@cpan.org>
Date: 2024-02-19 (Mon, 19 Feb 2024)

Changed paths:
M locale.c
M perl.c

Log Message:
-----------
locale.c,perl.c: Clean up MULTIPLICITY vs USE_THREADS

I believe I finally understand the difference between these, and this
commit is the result.

Under MULTIPLICITY, for locale.c, it:

1) Updates comments to reflect reality
2) displays the aTHX in DEBUGGING statements.
3) Uses reentrant mbrtowc vs non-reentrant mbtowc

Under multiplicity, for perl.c, it avoids a leak. PL_cur_locale_obj is
created whenever there is MULTIPLICITY, not just when threaded, so needs
to be destroyed whenever MULTIPLICITY.



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