98 lines
2.5 KiB
C
98 lines
2.5 KiB
C
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// Copyright (c) 2018 GeometryFactory Sarl (France).
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// All rights reserved.
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//
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// This file is part of CGAL (www.cgal.org)
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//
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// $URL: https://github.com/CGAL/cgal/blob/v5.1/STL_Extension/include/CGAL/thread.h $
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// $Id: thread.h 0779373 2020-03-26T13:31:46+01:00 Sébastien Loriot
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// SPDX-License-Identifier: LGPL-3.0-or-later OR LicenseRef-Commercial
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//
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// Author(s) : Simon Giraudot
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#ifndef CGAL_THREAD_H
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#define CGAL_THREAD_H
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#include <CGAL/config.h>
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/*
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This file defines the following:
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- CGAL::cpp11::thread
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- CGAL::cpp11::atomic
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- CGAL::cpp11::sleep_for
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It uses either TBB or STD depending on what's available: as TBB can
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quite often override `std::thread`, it is possible that TBB will be
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used instead of STD even if the real CXX11 `std::thread` is
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available.
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As the conflicting API between TBB and STD can be quite complicated,
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we offer a more generic `sleep_for()` function that takes
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double-typed seconds as argument and deals with it.
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*/
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#if defined(CGAL_LINKED_WITH_TBB)
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# include <tbb/tbb_config.h>
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# if TBB_IMPLEMENT_CPP0X
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# include <tbb/compat/thread>
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# include <atomic>
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# include <tbb/tick_count.h>
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# define CGAL_USE_TBB_THREADS 1
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# else
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# define CGAL_USE_TBB_THREADS 0
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# endif
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#else
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# define CGAL_USE_TBB_THREADS 0
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#endif
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#if !CGAL_USE_TBB_THREADS
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# include <thread>
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# include <chrono>
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#endif
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#include <CGAL/atomic.h> // for CGAL::cpp11::atomic
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namespace CGAL {
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namespace cpp11 {
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#if CGAL_USE_TBB_THREADS
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using std::thread; // std::thread is declared by TBB if TBB_IMPLEMENT_CPP0X == 1
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inline void sleep_for (double seconds)
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{
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// std::this_thread::sleep_for is declared by TBB if TBB_IMPLEMENT_CPP0X == 1
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// It takes interval_t types as argument (!= from the std norm)
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std::this_thread::sleep_for(tbb::tick_count::interval_t(seconds));
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}
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#else // C++11 implementation
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using std::thread;
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inline void sleep_for (double seconds)
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{
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// MSVC2013 cannot call `sleep_for()` with other types than
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// std::chrono::nanoseconds (bug in the implementation of the norm).
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typedef std::chrono::nanoseconds nanoseconds;
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nanoseconds ns (nanoseconds::rep (1000000000.0 * seconds));
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std::this_thread::sleep_for(ns);
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}
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#endif
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#if defined(CGAL_NO_ATOMIC) && defined(CGAL_LINKED_WITH_TBB)
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// If <CGAL/atomic.h> did not defined CGAL::cpp11::atomic, then use
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// std::atomic as a fallback.
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using std::atomic;
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#endif
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} // cpp11
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} //namespace CGAL
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#undef CGAL_USE_TBB_THREADS
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#endif // CGAL_THREAD_H
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