[MIT-Scheme-devel] floating-point environment in threads

[Taylor R Campbell]

   Date: Mon, 27 May 2013 17:13:20 -0700
   From: Matt Birkholz <address@hidden>

   Create-thread also breaks this, ever since someone added the near-
   useless, ABI-dependent floenvs and stuck one in each thread.

Attached is an unfinished patch to use lazy switching for the
floating-point environment so that threads that don't modify their
floating-point environments can store #F there instead.  I intend to
finish debugging it and commit it this week.

Some of the people who use the floating-point environment consider
putting memory-unsafe C libraries into Scheme's address space to be
useless, but let's not throw stones in this glass house of a project,
OK?  It's already limping along slowly enough.

lazy-floenv.patch
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