Mercurial > gnulib
view lib/nproc.h @ 40232:6771da173563
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author | Karl Berry <karl@freefriends.org> |
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date | Tue, 12 Mar 2019 09:07:54 -0700 |
parents | b06060465f09 |
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/* Detect the number of processors. Copyright (C) 2009-2019 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, see <https://www.gnu.org/licenses/>. */ /* Written by Glen Lenker and Bruno Haible. */ /* Allow the use in C++ code. */ #ifdef __cplusplus extern "C" { #endif /* 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 <https://en.wikipedia.org/wiki/Hyper-threading>). 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 } #endif /* C++ */