Lock on Memcache

[Jose Celestino]

Hello all,

I'm trying to debug some performance issues, that I think are related to a 
lock on some memcache functions on memcache-store.cpp, namely getMemcache().

What's the rationale for those locks? Is it because of thread safe issues 
with libmemcached? Because otherwise it makes little sense, at least in our 
scenario where we have a shibd per server, and the local locking gets 
somewhat lost in the server farm bigger picture.

TIA.