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Date: Tue, 27 Oct 2015 08:54:07 +0000
From: Eric Wong <normalperson@yhbt.net>
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References: <redmine.issue-11607.20151019214639@ruby-lang.org>
 <redmine.journal-54591.20151027084304.26b972846e0c84af@ruby-lang.org>
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Subject: [ruby-core:71212] Re: [Ruby trunk - Feature #11607] [PATCH] fiddle:
 release GVL for ffi_call
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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...