Asynchronous callbacks from C

[David M. Lloyd]

I have written an XS interface into a library that performs I/O and then
can asynchronously call a C function upon completion.  Is there a SAFE way
I can reflect an asynchronous callback into Perl?  I can't think of any
ways, but there are people on this list who are far more experienced than
me at this sort of thing. :-)

Thanks!

- D

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