Only explicitly shared data gets cloned on thread creation
No, it is exactly the opposite, everything but shared data gets cloned when a thread is created.

It is my impression that unshared items get cloned but that shared items get cloned and then a third item is created to mediate between the two clones. So slightly worse in terms of efficiency of thread creation.

- tye        

In reply to Re^13: Slow evolution of Perl = Perl is a closed Word (data cloning) by tye
in thread Slow evolution of Perl = Perl is a closed Word by Anonymous Monk

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