Hello I hope this is the good place to post this, since the subject is real-time capacity of a multi-thread application. I have made an app that displays the harmonics in 3d, and I want to be able to run it in real-time; Audio is played with Gstreamer. I have tried to use the 'set_schedparam' code, but I got the 'Invalid argument' during 'pthread_attr_setschedparam (&attr, &sched)' error... (as well as starting the app with 'chrt -r -p my-pid'). So I have used the 'rtpool-test' code from the Gstreamer core examples ( http://cgit.freedesktop.org/gstreamer/gstreamer/tree/tests/examples/streams ; ) and it works. When I run the app, then when I run 'ps -cLe in a terminal, to see all runing threads of the app, I see this (the app name is "spectrum3d": 5265 5265 TS 19 pts/0 00:00:01 spectrum3d 5265 5267 TS 19 pts/0 00:00:00 threaded-ml 5265 5268 TS 19 pts/0 00:00:00 threaded-ml 5265 5270 TS 19 pts/0 00:00:00 task0 5265 5271 TS 19 pts/0 00:00:00 spectrum3d 5265 5272 RR 90 pts/0 00:00:01 alsasrc:src The 1st pid is the GTK GUI; the last one must be the gstreamer sound playing, since its policy is RR with a priority of 90; for the record, I'd like to run it with the FIFO policy and I have asked Gstreamer how to manage that. but I don't know what the other pid represent... and my question is this : The app is written like this : 1) GTK GUI with a 'Play" button, that starts playing the sound, with Gstreamer, and the 'spectrum' element send messages to the bus that watches gstreamer 'pipeline'; 2) everytime the "message handler" function of Gstreamer retrives the values of the spectrum, there is a call to a function that display the values of the spectrum in a SDL/OpenGL window. So the question is : is the display in the SDL/OpenGL window done also with the RR policy or back with TS policy? How can I give real-time to the OpenGL process (since it is the most CPU consuming (I'm aware that real-time won't change the CPU load, but only change the priorities of the scheduler). Since it is very demanding, I'd like every 'real-time' part of the app has real-time policy (not the GTK GUI, I'm aware of that); furhermore, keyboard and mouse events are managed with SDL, and touch gestures are managed with the libutouch-geis API (multitouch input). thank u for your help Victor Victor -- To unsubscribe from this list: send the line "unsubscribe linux-rt-users" in the body of a message to majordomo@xxxxxxxxxxxxxxx More majordomo info at http://vger.kernel.org/majordomo-info.html
