perl5 uses reference counted garbage collection (since perl 5.8 - came out in 2002). They avoid the GIL by having a seperate interpreter instance per thread htt

perl5 uses reference counted garbage collection (since perl 5.8 - came out in 2002). They avoid the GIL by having a seperate interpreter instance per thread https://perl.mines-albi.fr/perl5.8.5/5.8.5/sun4-solaris/threads.html#description https://perl.mines-albi.fr/perl5.8.5/5.8.5/sun4-solaris/thre... If you want to share variables between threads, then they have to be marked as shared https://perl.mines-albi.fr/perl5.8.5/5.8.5/sun4-solaris/threads/shared.html https://perl.mines-albi.fr/perl5.8.5/5.8.5/sun4-solaris/thre...