[Ur] [PATCH] Make OpenSSL usage thread-safe (closes #206)

[Benjamin Barenblat]

On Monday,  3 August 2015, at  9.24 am EDT, Benjamin Barenblat wrote:
> Last night, I realized one of the FFI libraries I’ve written assumes a
> thread-safe OpenSSL.  This is currently not the case, as I’ve noted in
> bug #206 […].

Here’s a patch to fix this; I’ve also uploaded it to the bugtracker.
Code review is most appreciated.

For auditability, the patch’s SHA256 is
f5bcd42c3210f55a173a7ebd88434d12c679725774240d13c5bad7b835f41ce1.

Thanks in advance,
Benjamin
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