Lock: module
{
	PATH:	con "/dis/lib/lock.dis";

	Semaphore: adt {
		q: array of ref Sys->FD;
		obtain:	fn(nil: self ref Semaphore);
		release: fn(nil: self ref Semaphore);
		new: fn(): ref Semaphore;
	};
	
	init: fn();
};