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Its previous behavior, returning a const reference without locking, was wrong:
it could return a reference to an object in an inconsistent state if it was
concurrently being modified on another thread.
Locking the mutex and returning a copy by value is the correct behavior.
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Specifically:
LLCoros::Mutex means boost::fibers::mutex
LLCoros::LockType means std::unique_lock<boost::fibers::mutex>
LLCoros::ConditionVariable means boost::fibers::condition_variable
LLCoros::cv_status means boost::fibers::cv_status
So as not to drag in all of boost::fibers::mutex.hpp or condition_variable.hpp
for each consumer of llcoros.h, instead #define LLCOROS_MUTEX_HEADER and
LLCOROS_CONDVAR_HEADER. Those who need them can #include the relevant macro.
Update llcond.h and llthreadsafequeue.h accordingly.
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Also introduce value_type typedef.
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LLCond encapsulates the usage patterns required to properly use
condition_variable. We also provide LLScalarCond, LLBoolCond and LLOneShotCond.
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