I have noticed that for any TCF object, no matter how simple (even an empty one), the property reads "Thread Safe: No".
According to the documentation: "If the field indicates No (not thread safe), Witango Server waits for one execution of the instance to complete before it starts another, to avoid any interference between the two. From the user's perspective, the difference is in performance only. " If this is true, what difference does it make if we have an algorithm to handle critical sections? For all practical reasons, once one creates such an object there is a performance penalty. Perhaps the documentation should more clearly state this problem with TCFs. The "thread safe" subject is so briefly mentioned in the manual is difficult to understand why is it mentioned at all... Where do I go wrong? - Mike. -----Original Message----- From: Fogelson, Steve [mailto:[EMAIL PROTECTED] Sent: Monday, March 01, 2004 12:05 To: '[EMAIL PROTECTED]' Subject: RE: Witango-Talk: Thread Safe Class file Actually, I read about "thread safe" when reviewing Witango documentation for class files. Seemed like it would be advantageous with multi threading version 5. Maybe it is no big deal not to be thread safe. I just thought it would allow Witango to handle more concurrent requests. I checked a couple of my class files (per documentation) to see if they were thread safe and it indicates they are not. So I was wondering: 1) Do we have the ability to change this flag or does the app studio determine if it is? 2) What is required of a class file in order to be thread safe Thanks for the comments Steve -----Original Message----- From: Robert Shubert [mailto:[EMAIL PROTECTED] Sent: Monday, March 01, 2004 1:28 PM To: [EMAIL PROTECTED] Subject: RE: Witango-Talk: Thread Safe Class file Oops, my bad ... I was replying to Bill's post, who replied to you, replying to Bill who replied to Steve ... I think. :) -----Original Message----- From: Alan Wolfe [mailto:[EMAIL PROTECTED] Sent: Monday, March 01, 2004 1:36 PM To: [EMAIL PROTECTED] Subject: Re: Witango-Talk: Thread Safe Class file Steve was asking actualy so i dont know what his intentions are, i was just tossing in my 2 cents (: ----- Original Message ----- From: "Robert Shubert" <[EMAIL PROTECTED]> To: <[EMAIL PROTECTED]> Sent: Monday, March 01, 2004 10:25 AM Subject: RE: Witango-Talk: Thread Safe Class file > Alan, > > If you mean to make a TCF that is thread safe, it depends on why you > need it thread safe. Normally just using the method scope for all action > internal to the TCF is enough, however if you need to deal with external > dependencies, ie writing to two different log files in tandem, then you > need to use a higher scope, such as instance, or domain to record your > busy flag. Since I have more than one server, I can only depend on my > database as a single point of reference, and therefore set and release a > flag in my database to solve certain overrun problems. Make sure to > alert yourself or log when contention occurs since it can become a > problem can cause congestion if it goes wrong. > > Robert > > -----Original Message----- > From: Alan Wolfe [mailto:[EMAIL PROTECTED] > Sent: Monday, March 01, 2004 12:42 PM > To: [EMAIL PROTECTED] > Subject: Re: Witango-Talk: Thread Safe Class file > > hey Bill, correct me if im wrong but wouldnt this work too? I just like > this method because it waits until the other thread is done, so you dont > have to have code to recheck if it's busy. > > while (user$active != 0) > { > (doing nothing...) > } > > user$active = 1; > > do the stuff > > user$active = 0; > > ----- Original Message ----- > From: "Bill Conlon" <[EMAIL PROTECTED]> > To: "Witango-Talk" <[EMAIL PROTECTED]> > Sent: Monday, March 01, 2004 9:11 AM > Subject: Re: Witango-Talk: Thread Safe Class file > > > > Here's pseudo code to handle critical sections: > > > > if (user$active>0) > > error return, "sorry, you have a request pending, try again" > > else > > user$active=user$active+1 > > if (user$active=1) > > process stuff > > else > > error return: "sorry a thread inserted itself between the first > > error check and the processing check" > > endif > > user$active=user$active-1 > > good return > > > > > > > > >Where would I look to find out how to create a "thread safe" class > file? > > > > > >Steve Fogelson > > >Internet Commerce Solutions > > > >_______________________________________________________________________ > _ > > >TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf > > > > > > > > > Bill Conlon > > > > To the Point > > 345 California Avenue Suite 2 > > Palo Alto, CA 94306 > > > > office: 650.327.2175 > > fax: 650.329.8335 > > mobile: 650.906.9929 > > e-mail: mailto:[EMAIL PROTECTED] > > web: http://www.tothept.com > > > > > > > ________________________________________________________________________ > > TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf > > ________________________________________________________________________ > TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf > > ________________________________________________________________________ > TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf ________________________________________________________________________ TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf ________________________________________________________________________ TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf ________________________________________________________________________ TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf ________________________________________________________________________ TO UNSUBSCRIBE: Go to http://www.witango.com/developer/maillist.taf
