Hi All, I needed a rough idea about the lifetime of the threads. The reason being I am introducing stats in the backends and the stats will get reset every time the Backend is destroyed. If the backends get destroyed say once a day or every few hours, I can live with it. However, if they get destroyed every few minutes, then I have to think of an alternate solution.
Also, can I assume that if I have 8 threads of execution, there will be only 8 instances of the Backend running? Thanks, Seema >On 11/8/13 1:33 PM, "Seema Datar" <sda...@yahoo-inc.com> wrote: > >>Thanks. That helps. >> >>We use the DNSBackend so we should be able to use its destructor for >>cleanup. >> >>Also, I am assuming that DNSBackend termination will result in the thread >>termination too. >> >>Thanks, >>Seema >> >>On 11/8/13 1:03 PM, "Aki Tuomi" <cmo...@youzen.ext.b2.fi> wrote: >> >>>On Fri, Nov 08, 2013 at 07:22:40AM +0000, Seema Datar wrote: >>>> Hi All, >>>> >>>> Does anybody have more information on this? >>>> >>>> Thanks, >>>> Seema >>>> >>>> Hi All, >>>> >>>> We have a use case where we use PDNS with 8 backend threads. We needed >>>>to save thread specific data in an mmap. However, I came across the >>>>following in PDNS documentation - >>>> >>>> PowerDNS may instantiate multiple instances of your backend, or >>>>destroy >>>>existing copies and instantiate new ones. Backend code should therefore >>>>be thread-safe with respect to its static data. Additionally, it is >>>>wise >>>>if instantiation is a fast operation, with the possible exception of >>>>the >>>>first construction. >>>> >>>> The questions I had are - >>>> >>>> >>>> 1. What is the lifetime of a backend thread? >>>> 2. How often does a thread get destroyed and a new thread get >>>>created? >>>> 3. Is there any interface available to do a cleanup before the >>>>thread ends? >>>> >>>> Thanks, >>>> Seema >>> >>>Lifetime of a backend thread is dependant on several factors, and the >>>only >>>thing you can assume is that it's not something you can rely on. >>> >>>The only thing backend module can use for cleanup is the destructror of >>>the >>>backend class. >>> >>>Or if you use remote/pipebackend, you can wire it to look for EOF or >>>signal >>>and cleanup when either one is received before dying out. >>> >>>Aki Tuomi >> > _______________________________________________ Pdns-dev mailing list Pdns-dev@mailman.powerdns.com http://mailman.powerdns.com/mailman/listinfo/pdns-dev
