I'm writing an composition application using GTK+ on GNU/Linux. It is multithreaded. I use gthread-2.0 which is just a wrapper for pthread on GNU/Linux. So my question is rather about pthread. The reaction time of g_cond_wait and especially g_cond_signal is too slow for my needs. how can I speedup the hole thing. I just downloaded the source of eglibc and had a look at it.

So does anyone know if in debian GNU/Linux the pthread library uses realtime or do I have to compile it myself. Do I need to define a Macro like FUTEX_CLOCK_REALTIME or something like this? And what about realtime GNU/Linux? My project is hosted at sourceforge.net and is called ags.

I patched the linux kernel 2.6.31.6 with the patch-2.6.31.6-rt19 from kernel.org. But the first time I wasn't successful in compiling the kernel. So I disabled the staging drivers (Device Drivers) what enabled me to compile the realtime capable kernel successfully.
Then I did the steps necessary for low latency in alsa by following the instructions on alsa-project.org. Now I'm enjoying realtime ags!