> The advantage of threads in comparison to some timer treatment is obvious, > as far as I'm concerned. This was the major reason for us to deal with the > TThread-class in ROOT for our GO4-project. Completely agree. But one remark. Threads are very powerfull but dangerous approach. User must be very careful. So for simple task, timer is better, for complex, of course threads. Victor Marc Hemberger wrote: > > Hallo ROOTers, > > sorry for the late answer. > > The advantage of threads in comparison to some timer treatment is obvious, > as far as I'm concerned. This was the major reason for us to deal with the > TThread-class in ROOT for our GO4-project. > > We finally found a solution which might allow to perform also a graphics > update from within the ROOT thread class. This is already in use by us > here and by Martin Purschke at BNL. It is not yet perfect, but it is in my > view very close to a usable system (still the problem of object creation > and destruction in threads remains, esp. in lists). > > Thanks to Victor for his help on this topic and to Rene, who included our > changes as soon as they worked into his development version. As far as I > see it, you can try it and work with it (also for your graphics!). > > Greetings, > > Marc > > Dr. Marc Hemberger > > |\ _,,,---,, GSI, Abteilung DV&EE > ZZZzz /,`.-'`' -. ;-;;,_ Planckstr. 1 > |,4- ) )-,_. ,\ ( `'-' > '---''(_/--' `-'\_) 64291 Darmstadt > > M.Hemberger@gsi.de > > ** Disclaimer: My views/comments/beliefs, as strange as they are, are my own.** > > On Thu, 21 Oct 1999, Onuchin Valeriy wrote: > > > KOSU_FOKIN@garbo.lucas.lu.se wrote: > > > > > > Hello! > > > > > > After all these changes and work around performed by GSI groop ... Do we > > > have any chance to get ROOT graphical objects working in multithread env.? > > > This is the most important to handle because it is not much use of ROOT's > > > TThread if you can't put your Canvas update in a thread. > > > > > > Best regards, > > > Anton > > > > Hi Anton, > > one of the alternative to multiheading is using of > > QTTimer class. Look how it is done at > > http://emcal06.rhic.bnl.gov/~onuchin/Rt/examples.html > > > > hsimplem.C example. > > > > One of the advantage of this approach is possibility > > to set "dynamic priority" to thread by dynamic changing > > of the timer interval. > > > > Best regards. Valeriy > > -- Victor M. Perevoztchikov perev@bnl.gov perev@vxcern.cern.ch Brookhaven National Laboratory MS 510A PO Box 5000 Upton NY 11973-5000 tel office : 516-344-7894; fax 516-344-4206; home 516-345-2690
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