Suppose I have two J tasks A and B sharing a mapped file F. How can B best get to know that A has just changed F?
AFAICS, B needs to execute a duty-cycle inspecting the directory timestamp of F using 1!:0 (which may delay for up to a second), or alternatively watch for a checksum to change on F's contents (if it's large). Before I do, is there some JAL facility I've overlooked? Ideally, the very act of A changing F should send a message to B -- a system event, say, that can run a callback. ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
