New modules nproc, pthread.

[gnulib.git] / lib / nproc.c

diff --git a/lib/nproc.c b/lib/nproc.c
new file mode 100644 (file)
index 0000000..9a6e23a
--- /dev/null
+++ b/lib/nproc.c
@@ -0,0 +1,38 @@
+/* Detect the number of processors.
+
+   Copyright (C) 2009 Free Software Foundation, Inc.
+
+   This program is free software; you can redistribute it and/or modify
+   it under the terms of the GNU General Public License as published by
+   the Free Software Foundation; either version 2, or (at your option)
+   any later version.
+
+   This program is distributed in the hope that it will be useful,
+   but WITHOUT ANY WARRANTY; without even the implied warranty of
+   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+   GNU General Public License for more details.
+
+   You should have received a copy of the GNU General Public License
+   along with this program; if not, write to the Free Software Foundation,
+   Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA.  */
+
+/* Written by Glen Lenker.  */
+
+#include <config.h>
+#include "nproc.h"
+
+#include <unistd.h>
+
+/* Return the total number of processors.  The result is guaranteed to
+   be at least 1.  */
+unsigned long int
+num_processors (void)
+{
+#ifdef _SC_NPROCESSORS_ONLN
+  long int nprocs = sysconf (_SC_NPROCESSORS_ONLN);
+  if (0 < nprocs)
+    return nprocs;
+#endif
+
+  return 1;
+}