mirror of
https://git.savannah.gnu.org/git/emacs.git
synced 2024-11-26 07:33:47 +00:00
47 lines
1.7 KiB
C
47 lines
1.7 KiB
C
/* Detect the number of processors.
|
|
|
|
Copyright (C) 2009-2024 Free Software Foundation, Inc.
|
|
|
|
This file is free software: you can redistribute it and/or modify
|
|
it under the terms of the GNU Lesser General Public License as
|
|
published by the Free Software Foundation; either version 2.1 of the
|
|
License, or (at your option) any later version.
|
|
|
|
This file 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 Lesser General Public License for more details.
|
|
|
|
You should have received a copy of the GNU Lesser 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++ */
|