| /* Detect the number of processors. |
| |
| Copyright (C) 2009-2020 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++ */ |