The simplest approach is to use the queue, but that requires check...wait...check...wait....
Another way, is to have one master and several always awake slaves "listening" as devices. The master uses the SEND command to pipe a command directly into the "input stream" of the listeners. This makes them wake up instantly (more or less) instead of waiting a second or a minute to check the queue. -----Original Message----- From: Peter Cheney <peter.che...@firstmac.com.au> To: 'U2 Users List' <u2-users@listserver.u2ug.org> Sent: Thu, Mar 6, 2014 4:05 pm Subject: Re: [U2] Multi-threaded phantom processing My thoughts were that the parent will need to allocate the work and in doing so take the incoming data stream, launching a child and somehow pass the work to it. My only current knowledge of doing that within UV basic is writing to a queue and have the child phantom read from that and respond via another queue. Hence my question if there there's another possibly better way of doing it? It is nice to know if a particular phantom is busy or available though so that suggestion is certainly handy thanks. Peter Cheney Ultracs Developer t 07 3017 8837 | f 07 3002 8400 e peter.che...@firstmac.com.au w firstmac.com.au -----Original Message----- From: u2-users-boun...@listserver.u2ug.org [mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Wjhonson Sent: Friday, 7 March 2014 02:52 To: u2-users@listserver.u2ug.org Subject: Re: [U2] Multi-threaded phantom processing I was referring solely to the point of launching "phantoms" and how they could communicate back to their master who launched them. Not back to a different server. So the thread was mentioning a master-slave relationship on *a* server as I understood it. And the question asked was how do the slaves and master communicate. -----Original Message----- From: David A. Green <dgr...@dagconsulting.com> To: 'U2 Users List' <u2-users@listserver.u2ug.org> Sent: Thu, Mar 6, 2014 5:43 am Subject: Re: [U2] Multi-threaded phantom processing Will you kinda lost me on this approach. Since the Server socket is on a different machine than the client they don't see each other's locks. Different clients might be on different servers too. David A. Green (480) 201-7953 DAG Consulting -----Original Message----- From: u2-users-boun...@listserver.u2ug.org [mailto:u2-users-boun...@listserver.u2ug.org] On Behalf Of Wjhonson Sent: Wednesday, March 05, 2014 5:26 PM To: u2-users@listserver.u2ug.org Subject: Re: [U2] Multi-threaded phantom processing Peter is the only point of the "parent child communications" to address points like 1 I'm busy go away; OR 2 I'm available to work If so, you could simply use a lock-semaphore to address both of those issues.\ -----Original Message----- From: Horacio Pellegrino <pellegrin...@gmail.com> To: U2 Users List <u2-users@listserver.u2ug.org> Sent: Wed, Mar 5, 2014 4:19 pm Subject: Re: [U2] Multi-threaded phantom processing Why don't you have one port listening for requests, and as soon as they come in, you create a new phantom to answer that request ( liberating the listener immediately for the next request ), then when the phantom finishes it could log off. Might be you want to keep a "pool" of phantoms alive for a while, on the assumption they might be reused. That way you are sill using one license per request, but you have the benefit of "pooling"... You can always set min-max limit for those phantom-workers. Horacio Pellegrino On Tue, Mar 4, 2014 at 11:30 PM, Peter Cheney <peter.che...@firstmac.com.au>wrote: > Thanks David. As they say "Bigger than Ben-Hur"! > > That's a great idea. The server I have is listening on a predetermined > port. I trolled through /etc/services and a netstat on the remote host > to select something that looked unused. > > So then if it the main phantom spawns 1-n children (presumably more > phantoms?), it would also need to select 1-n ports which I suppose > must also be predetermined? Or is there a call to the OS that can > return an unused port? We're on AIX but the remote host is HPUX. > > Cheers > Peter > > > > Peter Cheney > Ultracs Developer > t 07 3017 8837 | f 07 3002 8400 > e peter.che...@firstmac.com.au > w firstmac.com.au > > > -----Original Message----- > From: u2-users-boun...@listserver.u2ug.org [mailto: > u2-users-boun...@listserver.u2ug.org] On Behalf Of David A. Green > Sent: Wednesday, 5 March 2014 13:01 > To: 'U2 Users List' > Subject: Re: [U2] Multi-threaded phantom processing > > Peter, first of all let me congratulate you on this achievement. > Having just finished a similar feat using UniData I understand the > complexities that went into it. > > The system I'm current working with will be relatively low traffic. > But I was pondering on the method of having a server socket that would > just spawn a transfer server socket and send the socket address to the calling client. > Then the client disconnects from the main server and just uses the > transfer server to complete the task. > > Having 10 open phantoms with sockets will use up 10 licenses. > > David A. Green > (480) 201-7953 > DAG Consulting > > > -----Original Message----- > From: u2-users-boun...@listserver.u2ug.org [mailto: > u2-users-boun...@listserver.u2ug.org] On Behalf Of Peter Cheney > Sent: Tuesday, March 04, 2014 6:18 PM > To: U2 Users List (u2-users@listserver.u2ug.org) > Subject: [U2] Multi-threaded phantom processing > > Hi Everyone, > > A project that I'm currently working on requires transmission of > transactional and ancillary data from one UV site to site to another. > I have the communications all set up and it is working very well via > the UV socket functions with a client at one end and a server at the other. > Both the client and the server both run as a UV phantom processes > written in UV basic and the data being transferred (also encrypted) is > more or less real time with various UV file triggers on the client end > creating queue items for transmission based on the data content / transaction type. > > This set up is a single threaded affair and I am wondering how it will > cope and what options I'll have as the volume of data increases. > > Multi-threading my server process to dish out some of the load might > be one possibility and I've seen examples in the past where the last > digit of a numeric key (i.e. 0-9) is used to determine which one of 10 > phantoms to call thus providing an effective distribution of the work. > > But even then, reading/writing processing data to a file for each > child process seems to me to be the only way to achieve parent <-> > child phantom communications at either end. Is there another way > perhaps? It may be that I will need 2 sets of phantoms, 1 for the > transactions and one for the ancillary data. Although we run UV on AIX > the only other requirement is that I must be able to do it within UV Basic. > > Does anyone out there on the list know of a better way or any > alternatives/advice so I can get a better appreciation of what else > might be possible please? > > Many thanks in advance, > Peter > > > Peter Cheney > Ultracs Developer > t 07 3017 8837 | f 07 3002 8400 > e peter.che...@firstmac.com.au > w firstmac.com.au > > > > > ---------------------------------------------------------------------- > --------- > Note: > This email (inc all attachments) is for the use of the intended > recipient(s) only. > Privileged or confidential information may be contained in this > communication. If you have received this email in error, please notify > the sender immediately and then delete all copies of this message from > your computer network. 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