Excellent thank you. I was thinking about doing exactly the same copy due to the problem of not knowing when I can unlock the mutex.
I am also considering having an 'updated' flag which will be set when the data is updated, then when get_first_data_point is called I know if I need to take a new copy or not. Cheers Graeme. > -----Original Message----- > From: Olivier Beytrison [mailto:[EMAIL PROTECTED] > Sent: 20 December 2006 10:17 > To: Graeme Wilson > Cc: net-snmp-coders@lists.sourceforge.net > Subject: Re: Question regarding the Iterator method > > > > Graeme Wilson a écrit : > >>I plan to use a simple mutex to avoid the linked list to be > >>read/written at the same time. The application won't be > under a heavy > >>load so this isn't a critical point imo. > >> > >>Olivier B. > >> > > > > > > Oliver, > > Where do you plan on locking/unlocking the mutex in the > subagent code? > > The obvious place to lock it is in get_first_data_point, but there > > doesn't seem to be such an obvious place to unlock it. > > > > I ask because I am writing some similar code and have been looking > > into this same issue. > > > > Cheers > > Graeme. > > > > > > At the begining, i planned to directly read through the > original datas. > But finally i choosed another method. once the > get_first_data_point is called, i'm locking the structure > with a mutex, then duplicate all the elements in the list, > and use the copy insteed of the original one. Once it's done, > i release the mutex, which allow other thread to update it again. > > Hope it will help > > Regards, > > Olivier B. > > ----- > Olivier Beytrison > Student in Telecommunication > University of Applied science > Fribourg - Switzerland > > ------------------------------------------------------------------------- Take Surveys. Earn Cash. Influence the Future of IT Join SourceForge.net's Techsay panel and you'll get the chance to share your opinions on IT & business topics through brief surveys - and earn cash http://www.techsay.com/default.php?page=join.php&p=sourceforge&CID=DEVDEV _______________________________________________ Net-snmp-coders mailing list Net-snmp-coders@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/net-snmp-coders
