>- see footer for list info -< This is why you use locking to deal with race conditions, so they wouldn't both be able to set the server variable at the same time.
Russ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Nick Middleweek Sent: 09 July 2008 15:24 To: Coldfusion Development Subject: Re: [CF-Dev] Semaphores in CF >- see footer for list info -< That would work in general but there may be times when the same piece of code runs at exactly the same time. and therefore both processes think they've got 'hold' over the code block. Read the last paragraph on the Example Usage for info on binary semaphores and mutex: http://en.wikipedia.org/wiki/Semaphore_%28programming%29 The 4D language has the perfect command set to handle semaphores: http://www.4d.com/4ddoc2004/CMU/CMU00143.HTM - I've noticed the optional tickcount parameter in 4D's Semphore command being WaitingTime. I guess this is equivalent to the CFLOCK's timeout parameter. Cheers, Nick 2008/7/8 Snake <[EMAIL PROTECTED]>: > >- see footer for list info -< > Or set a flag in a server variable so you know if the schedule is running. > > Russ > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] On Behalf Of Simon Baynes > Sent: 08 July 2008 18:02 > To: Coldfusion Development > Subject: Re: [CF-Dev] Semaphores in CF > > >- see footer for list info -< > Why don't you just use your database? Have a table with some flags in it! > > On Tue, Jul 8, 2008 at 5:53 PM, Nick Middleweek > <[EMAIL PROTECTED]> wrote: > >>- see footer for list info -< > > Hello, > > > > Does anyone know if we can use Semaphores? > > > > I have a page being executed from the CF scheduler to do X&Y which will > take > > some time depending on files to process. > > > > I only want the code to run X&Y at one time so if the scheduler kicks the > > code off again while the previous 'process' is running I want the new > > process to gracefully exit. > > > > In 4D I would use a Semaphore. A developer here has said about using > CFLOCK > > and put all code to be executed once between the tags; but I'm a little > > unclear on it's usage... > > > > I am right thinking that I can set the CFLOCK timeout settting to "1" and > > then set throwOnTimeout = "no" so that the new process will wait for one > > second to gain the lock and then drop out naturally without executing any > > code between the CFLOCK tags? > > > > Hope that makes sense. > > > > Cheers, > > Nick > > _______________________________________________ > > > > For details on ALL mailing lists and for joining or leaving lists, go to > http://list.cfdeveloper.co.uk/mailman/listinfo > > > > -- > > CFDeveloper Sponsors:- > >>- cfdeveloper Hosting provided by www.cfmxhosting.co.uk -< > >>- Lists hosted by www.Gradwell.com <http://www.gradwell.com/> -< > >>- CFdeveloper is run by Russ Michaels, feel free to volunteer your help > -< > > > > > > -- > Simon Baynes > www.simonbaynes.com > LinkedIn profile:- http://www.linkedin.com/in/simonbaynes > > _______________________________________________ > > For details on ALL mailing lists and for joining or leaving lists, go to > http://list.cfdeveloper.co.uk/mailman/listinfo > > -- > CFDeveloper Sponsors:- > >- cfdeveloper Hosting provided by www.cfmxhosting.co.uk -< > >- Lists hosted by www.Gradwell.com <http://www.gradwell.com/> -< > >- CFdeveloper is run by Russ Michaels, feel free to volunteer your help -< > > > > _______________________________________________ > > For details on ALL mailing lists and for joining or leaving lists, go to > http://list.cfdeveloper.co.uk/mailman/listinfo > > -- > CFDeveloper Sponsors:- > >- cfdeveloper Hosting provided by www.cfmxhosting.co.uk -< > >- Lists hosted by www.Gradwell.com <http://www.gradwell.com/> -< > >- CFdeveloper is run by Russ Michaels, feel free to volunteer your help -< > _______________________________________________ For details on ALL mailing lists and for joining or leaving lists, go to http://list.cfdeveloper.co.uk/mailman/listinfo -- CFDeveloper Sponsors:- >- cfdeveloper Hosting provided by www.cfmxhosting.co.uk -< >- Lists hosted by www.Gradwell.com -< >- CFdeveloper is run by Russ Michaels, feel free to volunteer your help -< _______________________________________________ For details on ALL mailing lists and for joining or leaving lists, go to http://list.cfdeveloper.co.uk/mailman/listinfo -- CFDeveloper Sponsors:- >- cfdeveloper Hosting provided by www.cfmxhosting.co.uk -< >- Lists hosted by www.Gradwell.com -< >- CFdeveloper is run by Russ Michaels, feel free to volunteer your help -<
