Yep ... sure miss sem$wait & sem$notify. You could accomplish the same thing with a simple socket-based protocol. The main process could listen on a socket and wait for any of the sub-processes to connect and send a message via the socket.
Larry Hiscock Western Computer Services -----Original Message----- From: owner-u2-us...@listserver.u2ug.org [mailto:owner-u2-us...@listserver.u2ug.org] On Behalf Of Tom Whitmore Sent: Thursday, February 26, 2009 12:25 PM To: u2-users@listserver.u2ug.org Subject: RE: [U2] Inter-Process Control... I agree. I wrote two little programs. LOCK.TEST1 0001 LOCK 60 ELSE CRT '60 LOCKED' 0002 CRT 'UNLOCKED' LOCK.TEST2 0001 UNLOCK 60 0002 CRT '60 WAS UNLOCKED' LOCK.TEST1 locked 60 displayed "unlocked". LOCK.TEST2 generated the error ' Program "LOCK.TEST2": Line 1, Lock 60 not owned by calling process' and then displayed "60 WAS UNLOCKED". As I was playing with the test programs as I type this. it looks like the first process needs to perform the first lock. The second process will then lock, and wait on the lock until the first process unlocks. I need to be able to support many-to-one processes. The "one" process waits on the lock and any of the "many" processes need to release the lock... which the old semaphore process supported... I confess, I'm spoiled. :) Thanks Tom -----Original Message----- From: owner-u2-us...@listserver.u2ug.org [mailto:owner-u2-us...@listserver.u2ug.org] On Behalf Of Kevin King Sent: Thursday, February 26, 2009 2:01 PM To: u2-users@listserver.u2ug.org Subject: Re: [U2] Inter-Process Control... Tom, can you elaborate when you say "the only process that can modify the lock is the one that set it". Isn't that exactly how a semaphore is supposed to work? Both processes should be able to set the lock but only one can have it at any moment in time. Or am I missing the point? ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/ ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/ ------- u2-users mailing list u2-users@listserver.u2ug.org To unsubscribe please visit http://listserver.u2ug.org/
