On Sat, Mar 06, 2004 at 11:59:45AM +0100, Jaroslav Kysela wrote: > On Sat, 6 Mar 2004, Giuliano Pochini wrote: > > > On the Echoaudio cards the sample rate is a global setting, so I need a way > > to prevent an app to change the rate if someone else already set it (the > > card han several devices/subdevices). I was thinking to put a simple > > "if (IsAudioOpen()) rate_min=rate_max=current_rate;" in pcm_open callback, > > but this solution is racy. Talking about race conditions you could use a variable which is set to 0 at the beginning. Now if app wants to set a rate it does atomic compare and increase (cmpxchg on x86) instruction so only one app could set rate. The other could only read memorized rate settins and report an error if rate is different.
Regards -- Adam Tla/lka mailto:[EMAIL PROTECTED] ^v^ ^v^ ^v^ System & Network Administration Group ~~~~~~ Computer Center, Gdansk University of Technology, Poland PGP public key: finger [EMAIL PROTECTED] ------------------------------------------------------- This SF.Net email is sponsored by: IBM Linux Tutorials Free Linux tutorial presented by Daniel Robbins, President and CEO of GenToo technologies. Learn everything from fundamentals to system administration.http://ads.osdn.com/?ad_id=1470&alloc_id=3638&op=click _______________________________________________ Alsa-devel mailing list [EMAIL PROTECTED] https://lists.sourceforge.net/lists/listinfo/alsa-devel
