29#ifndef _GLIBCXX_SEMAPHORE
30#define _GLIBCXX_SEMAPHORE 1
33#pragma GCC system_header
38#if __cplusplus > 201703L
41#define __glibcxx_want_semaphore
44#ifdef __cpp_lib_semaphore
45namespace std _GLIBCXX_VISIBILITY(default)
47_GLIBCXX_BEGIN_NAMESPACE_VERSION
49 template<ptrdiff_t __least_max_value = __semaphore_impl::_S_max>
50 class counting_semaphore
52 static_assert(__least_max_value >= 0);
53 static_assert(__least_max_value <= __semaphore_impl::_S_max);
55 __semaphore_impl _M_sem;
58 explicit counting_semaphore(ptrdiff_t __desired) noexcept
62 ~counting_semaphore() =
default;
64 counting_semaphore(
const counting_semaphore&) =
delete;
65 counting_semaphore& operator=(
const counting_semaphore&) =
delete;
67 static constexpr ptrdiff_t
69 {
return __least_max_value; }
72 release(ptrdiff_t __update = 1) noexcept(noexcept(_M_sem._M_release(1)))
73 { _M_sem._M_release(__update); }
76 acquire() noexcept(noexcept(_M_sem._M_acquire()))
77 { _M_sem._M_acquire(); }
80 try_acquire() noexcept(noexcept(_M_sem._M_try_acquire()))
81 {
return _M_sem._M_try_acquire(); }
83 template<
typename _Rep,
typename _Period>
85 try_acquire_for(
const std::chrono::duration<_Rep, _Period>& __rtime)
86 {
return _M_sem._M_try_acquire_for(__rtime); }
88 template<
typename _Clock,
typename _Dur>
90 try_acquire_until(
const std::chrono::time_point<_Clock, _Dur>& __atime)
91 {
return _M_sem._M_try_acquire_until(__atime); }
94 using binary_semaphore = std::counting_semaphore<1>;
96_GLIBCXX_END_NAMESPACE_VERSION
ISO C++ entities toplevel namespace is std.