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15e38d0d CF |
1 | // chrono -*- C++ -*- |
2 | ||
83ffe9cd | 3 | // Copyright (C) 2008-2023 Free Software Foundation, Inc. |
15e38d0d CF |
4 | // |
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 | |
748086b7 | 8 | // Free Software Foundation; either version 3, or (at your option) |
15e38d0d CF |
9 | // any later version. |
10 | ||
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. | |
15 | ||
748086b7 JJ |
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. | |
19 | ||
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/>. | |
15e38d0d | 24 | |
2e8a9734 | 25 | #include <bits/c++config.h> |
15e38d0d CF |
26 | #include <chrono> |
27 | ||
1f08a749 | 28 | // Conditional inclusion of sys/time.h for gettimeofday |
15e38d0d CF |
29 | #if !defined(_GLIBCXX_USE_CLOCK_MONOTONIC) && \ |
30 | !defined(_GLIBCXX_USE_CLOCK_REALTIME) && \ | |
31 | defined(_GLIBCXX_USE_GETTIMEOFDAY) | |
32 | #include <sys/time.h> | |
33 | #endif | |
1f08a749 | 34 | |
2e8a9734 JJ |
35 | #ifdef _GLIBCXX_USE_CLOCK_GETTIME_SYSCALL |
36 | #include <unistd.h> | |
37 | #include <sys/syscall.h> | |
38 | #endif | |
15e38d0d | 39 | |
12ffa228 BK |
40 | namespace std _GLIBCXX_VISIBILITY(default) |
41 | { | |
4a15d842 FD |
42 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
43 | ||
15e38d0d CF |
44 | namespace chrono |
45 | { | |
357d6fcd | 46 | _GLIBCXX_BEGIN_INLINE_ABI_NAMESPACE(_V2) |
1f08a749 | 47 | |
1b97ec17 | 48 | constexpr bool system_clock::is_steady; |
15e38d0d CF |
49 | |
50 | system_clock::time_point | |
8535715d | 51 | system_clock::now() noexcept |
15e38d0d | 52 | { |
88399079 | 53 | #ifdef _GLIBCXX_USE_CLOCK_REALTIME |
1e3e6c70 | 54 | timespec tp; |
88399079 | 55 | // -EINVAL, -EFAULT |
2e8a9734 JJ |
56 | #ifdef _GLIBCXX_USE_CLOCK_GETTIME_SYSCALL |
57 | syscall(SYS_clock_gettime, CLOCK_REALTIME, &tp); | |
58 | #else | |
88399079 | 59 | clock_gettime(CLOCK_REALTIME, &tp); |
2e8a9734 | 60 | #endif |
88399079 CF |
61 | return time_point(duration(chrono::seconds(tp.tv_sec) |
62 | + chrono::nanoseconds(tp.tv_nsec))); | |
15e38d0d | 63 | #elif defined(_GLIBCXX_USE_GETTIMEOFDAY) |
88399079 CF |
64 | timeval tv; |
65 | // EINVAL, EFAULT | |
8fc81078 | 66 | gettimeofday(&tv, 0); |
88399079 CF |
67 | return time_point(duration(chrono::seconds(tv.tv_sec) |
68 | + chrono::microseconds(tv.tv_usec))); | |
15e38d0d | 69 | #else |
88399079 CF |
70 | std::time_t __sec = std::time(0); |
71 | return system_clock::from_time_t(__sec); | |
15e38d0d CF |
72 | #endif |
73 | } | |
1f08a749 | 74 | |
f92ab29f | 75 | |
1b97ec17 | 76 | constexpr bool steady_clock::is_steady; |
8535715d | 77 | |
1b97ec17 | 78 | steady_clock::time_point |
8535715d | 79 | steady_clock::now() noexcept |
88399079 | 80 | { |
2e8a9734 | 81 | #ifdef _GLIBCXX_USE_CLOCK_MONOTONIC |
1e3e6c70 | 82 | timespec tp; |
88399079 | 83 | // -EINVAL, -EFAULT |
2e8a9734 JJ |
84 | #ifdef _GLIBCXX_USE_CLOCK_GETTIME_SYSCALL |
85 | syscall(SYS_clock_gettime, CLOCK_MONOTONIC, &tp); | |
86 | #else | |
88399079 | 87 | clock_gettime(CLOCK_MONOTONIC, &tp); |
2e8a9734 | 88 | #endif |
88399079 CF |
89 | return time_point(duration(chrono::seconds(tp.tv_sec) |
90 | + chrono::nanoseconds(tp.tv_nsec))); | |
2e8a9734 JJ |
91 | #else |
92 | return time_point(system_clock::now().time_since_epoch()); | |
88399079 | 93 | #endif |
2e8a9734 | 94 | } |
53dc5044 | 95 | |
357d6fcd | 96 | _GLIBCXX_END_INLINE_ABI_NAMESPACE(_V2) |
12ffa228 | 97 | } // namespace chrono |
4a15d842 FD |
98 | |
99 | _GLIBCXX_END_NAMESPACE_VERSION | |
12ffa228 | 100 | } // namespace std |