lib/sysdep/os/linux/lcpu.cpp sched_getaffinity fails with errno 22 (EINVAL)

[markelov]

PROBLEM: after compiling and running test_dbg stack call trace lead us to the problem in lib/sysdep/os/linux/lcpu.cpp file while calling to sched_getaffinity function which fails with errno 22 (EINVAL) if you choose Launch debug and test errno after calling to this function.

DESCRIPTION: problem comes not from the game, but from incompatibility of the Linux kernel with NUMA support and glibc. The whole description with solution you may find by the link in the section below.

SOLUTION:  http://sourceware.org/ml/libc-help/2009-10/msg00017.html

[markelov]

before applying the solution test fails in lcpu file and pyrogenesis shows black screen which can be killed only by going to a new tty and running killall -9 pyrogenesis

[Philip]

From that mail thread it looks like we should avoid the problems by using CPU_*_S(), but I'm not sure exactly how to do that and I don't have any way to test whether it fixes this error. If you have a working patch then I'd be happy to apply it.

[philip]

(In [8024]) Disable implementation of os_cpu_SetThreadAffinityMask on Linux, since it's not necessary and it causes errors. Should fix #547.

[markelov]

or change CONFIG_NR_CPUS to something lesser or equal 1024

[anonymous]

Milestone Complete deleted