47 lines
1.7 KiB
C
47 lines
1.7 KiB
C
/* Detect the number of processors.
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Copyright (C) 2009-2024 Free Software Foundation, Inc.
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This file is free software: you can redistribute it and/or modify
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it under the terms of the GNU Lesser General Public License as
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published by the Free Software Foundation; either version 2.1 of the
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License, or (at your option) any later version.
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This file is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU Lesser General Public License for more details.
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You should have received a copy of the GNU Lesser General Public License
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along with this program. If not, see <https://www.gnu.org/licenses/>. */
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/* Written by Glen Lenker and Bruno Haible. */
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/* Allow the use in C++ code. */
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#ifdef __cplusplus
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extern "C" {
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#endif
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/* A "processor" in this context means a thread execution unit, that is either
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- an execution core in a (possibly multi-core) chip, in a (possibly multi-
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chip) module, in a single computer, or
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- a thread execution unit inside a core
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(hyper-threading, see <https://en.wikipedia.org/wiki/Hyper-threading>).
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Which of the two definitions is used, is unspecified. */
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enum nproc_query
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{
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NPROC_ALL, /* total number of processors */
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NPROC_CURRENT, /* processors available to the current process */
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NPROC_CURRENT_OVERRIDABLE /* likewise, but overridable through the
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OMP_NUM_THREADS environment variable */
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};
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/* Return the total number of processors. The result is guaranteed to
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be at least 1. */
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extern unsigned long int num_processors (enum nproc_query query);
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#ifdef __cplusplus
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}
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#endif /* C++ */
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