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jeremybenn |
// chrono -*- C++ -*-
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// Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
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//
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// This file is part of the GNU ISO C++ Library. This library is free
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// software; you can redistribute it and/or modify it under the
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// terms of the GNU General Public License as published by the
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// Free Software Foundation; either version 3, or (at your option)
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// any later version.
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// This library 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 General Public License for more details.
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// Under Section 7 of GPL version 3, you are granted additional
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// permissions described in the GCC Runtime Library Exception, version
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// 3.1, as published by the Free Software Foundation.
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// You should have received a copy of the GNU General Public License and
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// a copy of the GCC Runtime Library Exception along with this program;
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// see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
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// <http://www.gnu.org/licenses/>.
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#include <chrono>
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#ifdef _GLIBCXX_USE_C99_STDINT_TR1
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// conditional inclusion of sys/time.h for gettimeofday
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#if !defined(_GLIBCXX_USE_CLOCK_MONOTONIC) && \
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!defined(_GLIBCXX_USE_CLOCK_REALTIME) && \
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defined(_GLIBCXX_USE_GETTIMEOFDAY)
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#include <sys/time.h>
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#endif
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namespace std _GLIBCXX_VISIBILITY(default)
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{
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namespace chrono
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{
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_GLIBCXX_BEGIN_NAMESPACE_VERSION
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constexpr bool system_clock::is_steady;
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system_clock::time_point
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system_clock::now() noexcept
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{
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#ifdef _GLIBCXX_USE_CLOCK_REALTIME
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timespec tp;
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// -EINVAL, -EFAULT
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clock_gettime(CLOCK_REALTIME, &tp);
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return time_point(duration(chrono::seconds(tp.tv_sec)
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+ chrono::nanoseconds(tp.tv_nsec)));
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#elif defined(_GLIBCXX_USE_GETTIMEOFDAY)
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timeval tv;
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// EINVAL, EFAULT
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gettimeofday(&tv, 0);
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return time_point(duration(chrono::seconds(tv.tv_sec)
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+ chrono::microseconds(tv.tv_usec)));
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#else
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std::time_t __sec = std::time(0);
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return system_clock::from_time_t(__sec);
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#endif
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}
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#ifdef _GLIBCXX_USE_CLOCK_MONOTONIC
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constexpr bool steady_clock::is_steady;
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steady_clock::time_point
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steady_clock::now() noexcept
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{
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timespec tp;
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// -EINVAL, -EFAULT
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clock_gettime(CLOCK_MONOTONIC, &tp);
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return time_point(duration(chrono::seconds(tp.tv_sec)
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+ chrono::nanoseconds(tp.tv_nsec)));
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}
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#endif
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_GLIBCXX_END_NAMESPACE_VERSION
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} // namespace chrono
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} // namespace std
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#endif // _GLIBCXX_USE_C99_STDINT_TR1
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