[PATCH 2/2] thread-utils.c: detect CPU count on older BSD-like systems

["Kyle J. McKay" <mackyle@gmail.com>]

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>
---
 thread-utils.c | 18 +++++++++++++++++-
 1 file changed, 17 insertions(+), 1 deletion(-)

diff --git a/thread-utils.c b/thread-utils.c
index 97396a75..a2135e07 100644
--- a/thread-utils.c
+++ b/thread-utils.c
@@ -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)
---