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util: Fix setting nr_cpus on some BSD variants

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Linux, FreeBSD, and DragonFly should have _SC_NOPROCESSORS_ONLN.  NetBSD
and OpenBSD should have HW_NCPUONLINE.  This is what FFmpeg uses on
those platforms.

FreeBSD sysconf(3) manual page:

https://www.freebsd.org/cgi/man.cgi?query=sysconf&sektion=3&apropos=0&manpath=freebsd

The FFmpeg patch is at:

https://patchwork.ffmpeg.org/project/ffmpeg/patch/YGi4sJx3trG3Yn7c@humpty.home.comstyle.com/

OpenBSD sysctl(2) manual page:

https://man.openbsd.org/sysctl.2

Acked-by: Marek Olšák <marek.olsak@amd.com>
Part-of: <https://gitlab.freedesktop.org/mesa/mesa/-/merge_requests/11228>
This commit is contained in:
Ian Romanick 2021-06-08 15:39:20 -07:00 • committed by Marge Bot
parent 44246892a0
commit 5623c75e40
1 changed files with 15 additions and 2 deletions
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17
src/util/u_cpu_detect.c
View file

@ -565,7 +565,20 @@ util_cpu_detect_once(void)
util_cpu_caps.nr_cpus = MAX2(1, system_info.dwNumberOfProcessors);
}
#elif defined(PIPE_OS_UNIX)
# if defined(_SC_NPROCESSORS_ONLN)
/* Linux, FreeBSD, DragonFly, and Mac OS X should have
* _SC_NOPROCESSORS_ONLN. NetBSD and OpenBSD should have HW_NCPUONLINE.
* This is what FFmpeg uses on those platforms.
*/
# if defined(PIPE_OS_BSD) && defined(HW_NCPUONLINE)
{
const int mib[] = { CTL_HW, HW_NCPUONLINE };
int ncpu;
int len = sizeof(ncpu);
sysctl(mib, 2, &ncpu, &len, NULL, 0);
util_cpu_caps.nr_cpus = ncpu;
}
# elif defined(_SC_NPROCESSORS_ONLN)
util_cpu_caps.nr_cpus = sysconf(_SC_NPROCESSORS_ONLN);
if (util_cpu_caps.nr_cpus == ~0)
util_cpu_caps.nr_cpus = 1;
@ -578,7 +591,7 @@ util_cpu_detect_once(void)
sysctl(mib, 2, &ncpu, &len, NULL, 0);
util_cpu_caps.nr_cpus = ncpu;
}
# endif
# endif /* defined(PIPE_OS_BSD) */
#endif /* defined(PIPE_OS_UNIX) */
if (util_cpu_caps.nr_cpus == 0)