From mboxrd@z Thu Jan 1 00:00:00 1970 From: Takashi Iwai Subject: Re: missing snd_dlclose in timer.c Date: Tue, 25 Apr 2006 16:41:14 +0200 Message-ID: References: <444DE5E0.9030200@purplelabs.com> <444E3270.3050203@purplelabs.com> Mime-Version: 1.0 (generated by SEMI 1.14.6 - "Maruoka") Content-Type: text/plain; charset=US-ASCII Return-path: Received: from mx2.suse.de (cantor2.suse.de [195.135.220.15]) by alsa.jcu.cz (ALSA's E-mail Delivery System) with ESMTP id 77A92169 for ; Tue, 25 Apr 2006 16:41:20 +0200 (MEST) In-Reply-To: <444E3270.3050203@purplelabs.com> Sender: alsa-devel-admin@lists.sourceforge.net Errors-To: alsa-devel-admin@lists.sourceforge.net List-Unsubscribe: , List-Post: List-Help: List-Subscribe: , List-Archive: To: Benoit Fouet Cc: alsa-devel@alsa-project.org List-Id: alsa-devel@alsa-project.org At Tue, 25 Apr 2006 16:30:08 +0200, Benoit Fouet wrote: > > Takashi Iwai wrote: > > At Tue, 25 Apr 2006 11:03:28 +0200, > Benoit Fouet wrote: > > Hi, > > I worked on an ARM9E platform with not much memory. We had to > dynamically link the libraries we needed. > BTW I found out that there was a dlclose missing in ALSA lib in the > snd_timer_open_conf function. > Find below the diff of my file, if you want to add it in th hg repository. > > A good catch. > > I just wonder whether it's safe to call dlclose() there. > Can the callback functions dynamically registered by open > (e.g. snd_timer_hw_open) be still accessed safely after dlclose()? > > Or should we keep dl handle and dlclose it in snd_timer_close()? > > Takashi > > It surely is safer to keep the library opened as long as its symbol are likely to be > used. > I'm afraid I'm not aware enough of how it works to answer more clearly. > btw, the symbols I used were in asound library, and were consequently still reachable > after dlclose as the library was not really unloaded. > Keeping the handle must be the best way to guarantee symbols can be reached until > snd_timer_close. I guess so, too. alsa-lib has a mechanism to allow users specifying an extra shared object to be loaded. Thus symbols are not always in libasound.so that is kept opened. I'll fix codes to call snd_dlclose() in close. thanks, Takashi ------------------------------------------------------- Using Tomcat but need to do more? Need to support web services, security? Get stuff done quickly with pre-integrated technology to make your job easier Download IBM WebSphere Application Server v.1.0.1 based on Apache Geronimo http://sel.as-us.falkag.net/sel?cmd=lnk&kid=120709&bid=263057&dat=121642