Camas

 
class Bed {

		 Queue waiting; 
}

void sleep(Bed b, Key k) {

		 InterruptStatus is = saveInterruptStatus();
		 disableInterrupts();

		 currentProcess.state = SLEEPING;

		 unlock(k);

		 b.waiting.put(currentProcess);

		 transfer(currentProcess.coroutine, kernel);

		 is.restore();

}

void wakeup(Bed b, Key k) {

		 InterruptStatus is = saveInterruptStatus();
		 disableInterrupts();

		 while ((Process p = b.waiting.get()) != null) {

		 		 p.state = WAITING;

		 		 k.waiting.put(p);

		 }

		 is.restore();

}