Use sockets? Henry Rich
On 4/29/2011 9:14 PM, Ian Clark wrote: > 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 > ---------------------------------------------------------------------- For information about J forums see http://www.jsoftware.com/forums.htm
