From 7dd14d03b069965c9577869841ce5646da7b7081 Mon Sep 17 00:00:00 2001
From: Baptiste Daroussin <bapt@FreeBSD.org>
Date: Sat, 15 Apr 2017 16:25:08 +0200
Subject: [PATCH] Enable multithreading on BSD

---
 programs/util.h | 18 ++++++++++++++++++
 1 file changed, 18 insertions(+)

diff --git a/programs/util.h b/programs/util.h
index b989e823..5f437b2b 100644
--- a/programs/util.h
+++ b/programs/util.h
@@ -657,6 +657,24 @@ failed:
     }
 }
 
+#elif defined(__FreeBSD__) || defined(__NetBSD__) || defined(__OpenBSD__) || defined(__DragonFly__)
+
+/* Use apple-provided syscall
+ * see: man 3 sysctl */
+UTIL_STATIC int UTIL_countPhysicalCores(void)
+{
+    static int numPhysicalCores = 0;
+
+    if (numPhysicalCores != 0) return numPhysicalCores;
+
+    numPhysicalCores = (int)sysconf(_SC_NPROCESSORS_ONLN);
+    if (numPhysicalCores == -1) {
+        /* value not queryable, fall back on 1 */
+        return numPhysicalCores = 1;
+    }
+    return numPhysicalCores;
+}
+
 #else
 
 UTIL_STATIC int UTIL_countPhysicalCores(void)