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2e8a9734 JJ |
1 | // Compatibility symbols for previous versions, C++0x bits -*- C++ -*- |
2 | ||
83ffe9cd | 3 | // Copyright (C) 2013-2023 Free Software Foundation, Inc. |
2e8a9734 JJ |
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 | |
8 | // Free Software Foundation; either version 3, or (at your option) | |
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 | ||
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/>. | |
24 | ||
2e8a9734 JJ |
25 | #include <bits/c++config.h> |
26 | ||
357d6fcd JW |
27 | #if _GLIBCXX_INLINE_VERSION |
28 | # error "compatibility-thread-c++0x.cc is not needed for gnu-versioned-namespace" | |
29 | #endif | |
30 | ||
1f08a749 | 31 | #ifdef _GLIBCXX_USE_C99_STDINT_TR1 |
2e8a9734 | 32 | |
1f08a749 BK |
33 | #ifdef _GLIBCXX_USE_GETTIMEOFDAY |
34 | #include <sys/time.h> | |
35 | #endif | |
36 | ||
37 | #define system_clock system_clockXX | |
2e8a9734 | 38 | #define steady_clock steady_clockXX |
1f08a749 BK |
39 | #include <chrono> |
40 | #undef system_clock | |
41 | #undef steady_clock | |
2e8a9734 | 42 | |
1f08a749 BK |
43 | namespace std _GLIBCXX_VISIBILITY(default) |
44 | { | |
4a15d842 FD |
45 | _GLIBCXX_BEGIN_NAMESPACE_VERSION |
46 | ||
1f08a749 BK |
47 | namespace chrono |
48 | { | |
1f08a749 BK |
49 | // NB: Default configuration was no realtime. |
50 | struct system_clock | |
51 | { | |
52 | #ifdef _GLIBCXX_USE_GETTIMEOFDAY | |
53 | typedef chrono::microseconds duration; | |
54 | #else | |
55 | typedef chrono::seconds duration; | |
2e8a9734 | 56 | #endif |
1f08a749 BK |
57 | |
58 | typedef duration::rep rep; | |
59 | typedef duration::period period; | |
60 | typedef chrono::time_point<system_clock, duration> time_point; | |
61 | ||
62 | static_assert(system_clock::duration::min() | |
63 | < system_clock::duration::zero(), | |
64 | "a clock's minimum duration cannot be less than its epoch"); | |
65 | ||
66 | static constexpr bool is_steady = false; | |
67 | ||
68 | static time_point | |
69 | now() noexcept; | |
70 | }; | |
71 | ||
72 | constexpr bool system_clock::is_steady; | |
73 | ||
74 | system_clock::time_point | |
75 | system_clock::now() noexcept | |
76 | { | |
77 | #ifdef _GLIBCXX_USE_GETTIMEOFDAY | |
78 | timeval tv; | |
79 | // EINVAL, EFAULT | |
80 | gettimeofday(&tv, 0); | |
81 | return time_point(duration(chrono::seconds(tv.tv_sec) | |
82 | + chrono::microseconds(tv.tv_usec))); | |
83 | #else | |
84 | std::time_t __sec = std::time(0); | |
8b70770d JW |
85 | // This is the conversion done by system_clock::from_time_t(__sec) |
86 | typedef chrono::time_point<system_clock, seconds> __from; | |
87 | return time_point_cast<system_clock::duration> | |
88 | (__from(chrono::seconds(__sec))); | |
1f08a749 BK |
89 | #endif |
90 | } | |
1f08a749 | 91 | } // namespace chrono |
4a15d842 FD |
92 | |
93 | _GLIBCXX_END_NAMESPACE_VERSION | |
1f08a749 BK |
94 | } // namespace std |
95 | ||
96 | #endif // _GLIBCXX_USE_C99_STDINT_TR1 |