That assert occurs when the underlying Linux "semop()" call to pend on a multi-process semaphore returns -1 (or failure).
In CE 2.00, we added multi-process support using Linux's System V semaphores which don't have a very nice cleanup policy if one of the processes owning/using the semaphore crashes. If it's reproducible, can you run your app with the env var CE_DEBUG set to 3 and send the [big] log file to this list? Also, upon failure, can you run "ipcs -s" on a console and send the results? This will report any "shared semaphores" that are in the system (perhaps leaked by a process that didn't clean up correctly). Chris ________________________________ From: minhong [mailto:[EMAIL PROTECTED] Sent: Friday, August 01, 2008 3:19 AM To: Ring, Chris; davinci-linux-open-source Subject: Re: Questions about codec engine Thanks for the answer for question1. For question2, I used CE 2.00. If there're further details for the assert, it'll be appreciate. I tried this and it never showed the assert: In both video_thread and image_thread, I assume that the VISA APIs need a critical region such that I did a mutex_lock before calling VISA APIs and mutex_unlock after that. Do I have to do this critical region protection ? minhong. ----- Original Message ----- From: Ring, Chris<mailto:[EMAIL PROTECTED]> To: minhong<mailto:[EMAIL PROTECTED]> ; davinci-linux-open-source<mailto:[email protected]> Sent: Thursday, July 31, 2008 9:06 PM Subject: RE: Questions about codec engine Multiple process support (which includes your multiple application use case) was added in Codec Engine 2.00. Prior to that release, you're limited to a single process (multiple threads within that process is supported). Also, when using multiple processes, if you're running remote algorithms on another processor (e.g. DM644x, DM6467), you must use LAD: http://wiki.davincidsp.com/index.php?title=Link_Arbiter_Daemon Given all that, on to your questions: 1. Yes, you can - and must(!) - call CERuntime_init() from both processes. 2. Your use case should work; please confirm which version of CE you're using (must be > 2.00 as described above) if you want us to report further details about the assert you're seeing. Chris
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