Condition variable objects

The condition variable employed by a mutex's trylock() is an internal condition variable. A separate object provides condition variable-like semantics:

#include <x/mutex.H>
#include <x/cond.H>

x::mutex::base::mlock lock=m->lock();

x::cond c=x::cond::create();

// ...

c->wait(lock);

// ...
c->notify_all();

x::cond is a reference-counted object that provides std::condition_variable-like semantics for mutexes. like the mutex object does. It also has an overloaded wait() that takes a second parameter that specifies an optional expiration time. It implements notify() and notify_all() which are analogous to its thin, non-reference counted cousin.