If you close those before launching your async process via system 1, ..., then it will not cause the server to block.

:) yes, I'm aware that is common, and I had close ... and it didn't work

In reply to Re^11: Win32: Setting a layer with binmode causes problem with close() on Windows (PerlIO silently fails to close the file) by Anonymous Monk
in thread Win32: Setting a layer with binmode causes problem with close() on Windows by rovf

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