From: Eric Wong <normalperson@...>
Date: 2015-10-27T08:54:07+00:00
Subject: [ruby-core:71212] Re: [Ruby trunk - Feature #11607] [PATCH] fiddle: release GVL for ffi_call

Yes, user must check if the function is MT-safe.  Probably fine
for most library functions...

Maybe releasing GVL can be optional, but I would rather avoid
exposing implementation detail or new APIs...