>- see footer for list info -< I was talking about using a transaction when checking my aforementioned database table. Which would prevent the process accidentally running concurrently.
I prefer using the database instead of cflock as it is monitorable and persistent so it can work in a clustered environment. On Thu, Jul 10, 2008 at 10:44 AM, Adrian Lynch <[EMAIL PROTECTED]> wrote: >>- see footer for list info -< > Well, not really. Transactions work on the DB, what about a block of code? > > Adrian > > -----Original Message----- > From: [EMAIL PROTECTED] > [mailto:[EMAIL PROTECTED] Behalf Of Simon Baynes > Sent: 10 July 2008 02:12 > To: Coldfusion Development > Subject: Re: [CF-Dev] Semaphores in CF > > >>- see footer for list info -< > That is why you would use a transaction, therefore no problem! > > On Wed, Jul 9, 2008 at 3:24 PM, Nick Middleweek > <[EMAIL PROTECTED]> wrote: >>>- 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 -< >>- 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 -< >- CFdeveloper is run by Russ Michaels, feel free to volunteer your help -<
