<html> <head> <style></style> </head> <body class='hmmessage'> I answer to myself It was quite easy to find... In the 'testrtpool.c' file, in the 'default-push' function, I just had to replace "SCHED_RR" by "SCHED_FIFO" On the other hand, 'param.sched_priority' is set to to 50, which can be changed also according to the priority one wants to give to the process; Victor <hr id="stopSpelling">From: nadaeck@hotmail.com To: gstreamer-devel@lists.freedesktop.org Subject: real time question : RR vs FF? Date: Thu, 28 Apr 2011 04:34:39 +0200 <meta http-equiv="Content-Type" content="text/html; charset=unicode"> <meta name="Generator" content="Microsoft SafeHTML"> <style> .ExternalClass .ecxhmmessage P {padding:0px;} .ExternalClass body.ecxhmmessage {font-size:10pt;font-family:Tahoma;} </style> Hello I have made an app that displays the harmonics in 3d. I want to be able to run it in real-time; I have used the 'rtpool-test' code from the gstreamer core examples (streams->rtpool-test.c) and it works. However, I have seen that this grants me a priority of 90 with a 'RR' policy. Is it possible to change the code code to get 'FIFO' policy? If yes, please how could I do this? I have tied 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') Another question : this code grants real time for Gstreamer code, but what about other code code (not Gstreamer) that follows it? The app is written like this : GTK GUI with a 'Play" button, that starts playing the sound with Gstreamer, and the 'spectrum' element send messages to the bus; everytime the "message handler" function 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. My question is : is the display in the SDL/OpenGL window done also with the RR policy or back with TS policy? When I run the app (its name is 'spectrum3d', then when I run 'ps -cLe' in a terminal to see all the threads of the app, I see this :  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 reading, since its policy is RR; but I don't know what the other pid represent... thanks for your help Victor _______________________________________________ gstreamer-devel mailing list gstreamer-devel@lists.freedesktop.org http://lists.freedesktop.org/mailman/listinfo/gstreamer-devel </body> </html>