X-Git-Url: https://erislabs.net/gitweb/?a=blobdiff_plain;f=lib%2Fnproc.h;h=3ce51b56617e4852f73f7ed01450d375a75fcdc4;hb=b28ec8ed78286cbd1d113d0785e0e1f5cf11832e;hp=e9d65b9518ed744006389e838afbc8d4f64e7b91;hpb=cea50d697cd3410c88243fccbdbb4488b13f9e52;p=gnulib.git
diff --git a/lib/nproc.h b/lib/nproc.h
index e9d65b951..3ce51b566 100644
--- a/lib/nproc.h
+++ b/lib/nproc.h
@@ -1,6 +1,6 @@
/* Detect the number of processors.
- Copyright (C) 2009 Free Software Foundation, Inc.
+ Copyright (C) 2009-2013 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
@@ -13,17 +13,33 @@
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. */
+ along with this program; if not, see . */
-/* Written by Glen Lenker. */
+/* Written by Glen Lenker and Bruno Haible. */
/* Allow the use in C++ code. */
#ifdef __cplusplus
extern "C" {
#endif
-unsigned long int num_processors (void);
+/* A "processor" in this context means a thread execution unit, that is either
+ - an execution core in a (possibly multi-core) chip, in a (possibly multi-
+ chip) module, in a single computer, or
+ - a thread execution unit inside a core
+ (hyper-threading, see ).
+ Which of the two definitions is used, is unspecified. */
+
+enum nproc_query
+{
+ NPROC_ALL, /* total number of processors */
+ NPROC_CURRENT, /* processors available to the current process */
+ NPROC_CURRENT_OVERRIDABLE /* likewise, but overridable through the
+ OMP_NUM_THREADS environment variable */
+};
+
+/* Return the total number of processors. The result is guaranteed to
+ be at least 1. */
+extern unsigned long int num_processors (enum nproc_query query);
#ifdef __cplusplus
}