runtime (ie, when logging).
The implementation is cludgy. This is because we create threads before main,
as a result of global thread objects (as opposed to pointers to thread objects
that get new'ed and started in main).
A view of the system through strace indicates one or two calls to gettid() per
thread (usually 1, occasionally 2). Changing the read lock in Log() to a write
lock deadlocks.
Utils.h still has a using namespace, to prevent non-CommonLibs? code from
breaking. All CommonLibs? code has been compiled with tue Utils.h "using
namespace" commented out, though.