On BSDs, where SC_NPROCESSORS_ONLN is not available, the number of
online processors can be retrieved using `sysctl'.
Cheers,
Giuseppe
>From 73c11226e320c1144887daeb15e3f549b0bb2ee5 Mon Sep 17 00:00:00 2001
From: Giuseppe Scrivano <gscriv...@gnu.org>
Date: Sun, 18 Oct 2009 01:20:14 +0200
Subject: [PATCH] nproc: use `sysctl' when it is available.
* lib/nproc.c (num_processors): If `sysctl' is available, use it to
get the number of online processors.
---
lib/nproc.c | 10 ++++++++++
1 files changed, 10 insertions(+), 0 deletions(-)
diff --git a/lib/nproc.c b/lib/nproc.c
index 9a6e23a..f45feaf 100644
--- a/lib/nproc.c
+++ b/lib/nproc.c
@@ -34,5 +34,15 @@ num_processors (void)
return nprocs;
#endif
+#ifdef HW_NCPU
+ int ret;
+ int mib[2] = {CTL_HW, HW_NCPU};
+ long int nprocs;
+ size_t len = sizeof (nprocs);
+ ret = sysctl (mib, 2, &nprocs, &len, NULL, 0);
+ if (ret == 0)
+ return nprocs;
+#endif
+
return 1;
}
--
1.6.3.3
