From: Thomas Schilling <nominolo@googlemail.com>
Date: Mon, 17 Aug 2009 14:23:52 +0000 (+0000)
Subject: Make the dynamic linker thread-safe.
X-Git-Url: http://git.megacz.com/?a=commitdiff_plain;h=4fa44a3ae9c36222ccb460ba3ed24e46bf7c70ae;hp=4fa44a3ae9c36222ccb460ba3ed24e46bf7c70ae;p=ghc-hetmet.git

Make the dynamic linker thread-safe.

The current implementation is rather pessimistic.  The persistent
linker state is now an MVar and all exported Linker functions are
wrapped in modifyMVar calls.  This is serves as a big lock around all
linker functions.

There might be a chance for more concurrency in a few places. E.g.,
extending the closure environment and loading packages might be
independent in some cases.  But for now it's better to be on the safe
side.
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