/// per-thread pawn and material hash tables so that once we get a pointer to an
/// entry its life time is unlimited and we don't have to care about someone
/// changing the entry under our feet.
/// per-thread pawn and material hash tables so that once we get a pointer to an
/// entry its life time is unlimited and we don't have to care about someone
/// changing the entry under our feet.
/// parking and, most importantly, launching a thread. All the access to threads
/// data is done through this class.
/// parking and, most importantly, launching a thread. All the access to threads
/// data is done through this class.