1 // std::this_thread::sleep_for/until declarations -*- C++ -*-
3 // Copyright (C) 2008-2024 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/>.
25 /** @file bits/this_thread_sleep.h
26 * This is an internal header file, included by other library headers.
27 * Do not attempt to use it directly. @headername{thread}
30 #ifndef _GLIBCXX_THIS_THREAD_SLEEP_H
31 #define _GLIBCXX_THIS_THREAD_SLEEP_H 1
33 #pragma GCC system_header
35 #if __cplusplus >= 201103L
36 #include <bits/chrono.h> // std::chrono::*
38 #ifdef _GLIBCXX_USE_NANOSLEEP
39 # include <cerrno> // errno, EINTR
40 # include <time.h> // nanosleep
43 namespace std
_GLIBCXX_VISIBILITY(default)
45 _GLIBCXX_BEGIN_NAMESPACE_VERSION
47 /** @addtogroup threads
51 /** @namespace std::this_thread
52 * @brief ISO C++ 2011 namespace for interacting with the current thread
54 * C++11 30.3.2 [thread.thread.this] Namespace this_thread.
58 #ifndef _GLIBCXX_NO_SLEEP
60 #ifndef _GLIBCXX_USE_NANOSLEEP
62 __sleep_for(chrono::seconds
, chrono::nanoseconds
);
65 /// this_thread::sleep_for
66 template<typename _Rep
, typename _Period
>
68 sleep_for(const chrono::duration
<_Rep
, _Period
>& __rtime
)
70 if (__rtime
<= __rtime
.zero())
72 auto __s
= chrono::duration_cast
<chrono::seconds
>(__rtime
);
73 auto __ns
= chrono::duration_cast
<chrono::nanoseconds
>(__rtime
- __s
);
74 #ifdef _GLIBCXX_USE_NANOSLEEP
75 struct ::timespec __ts
=
77 static_cast<std::time_t>(__s
.count()),
78 static_cast<long>(__ns
.count())
80 while (::nanosleep(&__ts
, &__ts
) == -1 && errno
== EINTR
)
83 __sleep_for(__s
, __ns
);
87 /// this_thread::sleep_until
88 template<typename _Clock
, typename _Duration
>
90 sleep_until(const chrono::time_point
<_Clock
, _Duration
>& __atime
)
92 #if __cplusplus > 201703L
93 static_assert(chrono::is_clock_v
<_Clock
>);
95 auto __now
= _Clock::now();
96 if (_Clock::is_steady
)
99 sleep_for(__atime
- __now
);
102 while (__now
< __atime
)
104 sleep_for(__atime
- __now
);
105 __now
= _Clock::now();
109 } // namespace this_thread
113 _GLIBCXX_END_NAMESPACE_VERSION
117 #endif // _GLIBCXX_THIS_THREAD_SLEEP_H