class cv {

	mutex cv_m;
	list<ucontext_t*> blockedThreads;

	void wait(&mutex m){

		// need interrupts disabled -- can't call mutex!

		m.unlock();  // needs to come afterwards???
		cv_m.lock(); // swapping order amy cause deadlock
		
		// add this context to blocked threads

		cv_m.unlock(); 	// don't want to block other threads
				// from looking at cv_queue;

		// need to get guard variable ???
		// swap to next waiting thread
		// asserts
		// release guard variable
		
		m.lock();
	}

	void signal(){
	cv_m.lock();

	// ????

	cv_m.unlock();
	}
};