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thread-utils.c: detect CPU count on older BSD-like systems 

Not all systems support using sysconf to detect the number
of available CPU cores.  Older BSD and BSD-derived systems
only provide the information via the sysctl function.

If HAVE_BSD_SYSCTL is defined attempt to retrieve the number
of available CPU cores using the sysctl function.

If HAVE_BSD_SYSCTL is not defined or the sysctl function
fails, we still attempt to get the information via sysconf.

Signed-off-by: Kyle J. McKay <mackyle@gmail.com>
Signed-off-by: Junio C Hamano <gitster@pobox.com>
This commit is contained in:
Kyle J. McKay 2015-03-07 23:14:37 -08:00 committed by Junio C Hamano
parent 9529080de2
commit a25b5a32c7
1 changed files with 17 additions and 1 deletions
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18
thread-utils.c
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@ -35,7 +35,23 @@ int online_cpus(void)
if (!pstat_getdynamic(&psd, sizeof(psd), (size_t)1, 0))
return (int)psd.psd_proc_cnt;
#endif
#elif defined(HAVE_BSD_SYSCTL) && defined(HW_NCPU)
int mib[2];
size_t len;
int cpucount;
mib[0] = CTL_HW;
# ifdef HW_AVAILCPU
mib[1] = HW_AVAILCPU;
len = sizeof(cpucount);
if (!sysctl(mib, 2, &cpucount, &len, NULL, 0))
return cpucount;
# endif /* HW_AVAILCPU */
mib[1] = HW_NCPU;
len = sizeof(cpucount);
if (!sysctl(mib, 2, &cpucount, &len, NULL, 0))
return cpucount;
#endif /* defined(HAVE_BSD_SYSCTL) && defined(HW_NCPU) */
#ifdef _SC_NPROCESSORS_ONLN
if ((ncpus = (long)sysconf(_SC_NPROCESSORS_ONLN)) > 0)