${ caller()."::meta" } = 1;

[download]

Caveat: Assumes the calling package and the package in which the sub was compiled is the same, so the following won't work: 

package pkg3;

sub foo { print "$_[0]: meta=$meta;\n"; };

package pkg2;

pkg1::test1(\&pkg3::foo);

[download]

$_, $a and $b are usually used since strict doesn't complain about them. $_ is truly global, but $a and $b require using caller as above.

In reply to Re: Accessing variable in callback running context by ikegami
in thread Accessing variable in callback running context by thewebsi

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