./devel/p5-B-COW, Some naive additional B helpers to check the COW status of one SvPV

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Branch: pkgsrc-2021Q1, Version: 0.004nb1, Package name: p5-B-COW-0.004nb1, Maintainer: pkgsrc-users

B::COW provides some naive additional B helpers to check the COW
status of one SvPV. COW or Copy On Write introduction

A COWed SvPV is sharing its string (the PV) with other SvPVs. It's a
(kind of) Read Only C string, that would be Copied On Write (COW).

More than one SV can share the same PV, but when one PV need to alter
it, it would perform a copy of it, decrease the COWREFCNT counter.

One SV can then drop the COW flag when it's the only one holding a
pointer to the PV.

The COWREFCNT is stored at the end of the PV, after the the "\0".

That value is limited to 255, when we reach 255, a new PV would be
created,

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SHA1: acfcd1214e39e980dcd24e33059255b8e92099b8
RMD160: 7e923587e6217bde4d63e41d746ca39612827349
Filesize: 17.866 KB

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