I have some code that has worked for years under 32-bit versions of Debian (and other distros before that). Specifically, it works fine under 32-bit buster. But on a pristine 64-bit installation it fails, and I can sort-of understand why, but I don't know how to fix it.
The code tried to create a pthread with SCHED_FIFO policy and a priority of 95. The call to pthread_create() fails with an EPERM error. If I run ulimit -r, it returns 0, which is probably why the call to pthread_create() failing, but I don't know what to change so that I (operating as an ordinary user) can create a SCHED_FIFO thread with priority > 0. The documentation I've found says to edit /etc/security/limits.conf, and I have done so, adding the line: n7dr hard rtprio 99 but that made no difference :-( None of my notes say that I had to do anything special to get this to work in the past, but it's possible (barely) that somehow I had to edit a configuration file of some kind and simply forgot to make a note. What am I missing/forgetting? Doc -- Web: http://enginehousebooks.com/drevans
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