3 // Copyright (C) 2008, 2009, 2010, 2011 Free Software Foundation, Inc.
5 // This file is part of the GNU ISO C++ Library. This library is free
6 // software; you can redistribute it and/or modify it under the
7 // terms of the GNU General Public License as published by the
8 // Free Software Foundation; either version 3, or (at your option)
11 // This library is distributed in the hope that it will be useful,
12 // but WITHOUT ANY WARRANTY; without even the implied warranty of
13 // MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
14 // GNU General Public License for more details.
16 // Under Section 7 of GPL version 3, you are granted additional
17 // permissions described in the GCC Runtime Library Exception, version
18 // 3.1, as published by the Free Software Foundation.
20 // You should have received a copy of the GNU General Public License and
21 // a copy of the GCC Runtime Library Exception along with this program;
22 // see the files COPYING3 and COPYING.RUNTIME respectively. If not, see
23 // <http://www.gnu.org/licenses/>.
27 #ifdef _GLIBCXX_USE_C99_STDINT_TR1
29 // conditional inclusion of sys/time.h for gettimeofday
30 #if !defined(_GLIBCXX_USE_CLOCK_MONOTONIC) && \
31 !defined(_GLIBCXX_USE_CLOCK_REALTIME) && \
32 defined(_GLIBCXX_USE_GETTIMEOFDAY)
36 namespace std
_GLIBCXX_VISIBILITY(default)
40 _GLIBCXX_BEGIN_NAMESPACE_VERSION
42 constexpr bool system_clock::is_steady
;
44 system_clock::time_point
45 system_clock::now() noexcept
47 #ifdef _GLIBCXX_USE_CLOCK_REALTIME
50 clock_gettime(CLOCK_REALTIME
, &tp
);
51 return time_point(duration(chrono::seconds(tp
.tv_sec
)
52 + chrono::nanoseconds(tp
.tv_nsec
)));
53 #elif defined(_GLIBCXX_USE_GETTIMEOFDAY)
57 return time_point(duration(chrono::seconds(tv
.tv_sec
)
58 + chrono::microseconds(tv
.tv_usec
)));
60 std::time_t __sec
= std::time(0);
61 return system_clock::from_time_t(__sec
);
65 #ifdef _GLIBCXX_USE_CLOCK_MONOTONIC
66 constexpr bool steady_clock::is_steady
;
68 steady_clock::time_point
69 steady_clock::now() noexcept
73 clock_gettime(CLOCK_MONOTONIC
, &tp
);
74 return time_point(duration(chrono::seconds(tp
.tv_sec
)
75 + chrono::nanoseconds(tp
.tv_nsec
)));
79 _GLIBCXX_END_NAMESPACE_VERSION
83 #endif // _GLIBCXX_USE_C99_STDINT_TR1