libstdc++: semaphore Source File (original) (raw)
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29#ifndef _GLIBCXX_SEMAPHORE
30#define _GLIBCXX_SEMAPHORE 1
31
32#pragma GCC system_header
33
35
36#if __cplusplus > 201703L
38
39#define __glibcxx_want_semaphore
41
42#ifdef __cpp_lib_semaphore
43namespace std _GLIBCXX_VISIBILITY(default)
44{
45_GLIBCXX_BEGIN_NAMESPACE_VERSION
46
47 template<ptrdiff_t __least_max_value = __semaphore_impl::_S_max>
48 class counting_semaphore
49 {
50 static_assert(__least_max_value >= 0);
51 static_assert(__least_max_value <= __semaphore_impl::_S_max);
52
53 __semaphore_impl _M_sem;
54
55 public:
56 explicit counting_semaphore(ptrdiff_t __desired) noexcept
57 : _M_sem(__desired)
58 { }
59
60 ~counting_semaphore() = default;
61
62 counting_semaphore(const counting_semaphore&) = delete;
63 counting_semaphore& operator=(const counting_semaphore&) = delete;
64
65 static constexpr ptrdiff_t
66 max() noexcept
67 { return __least_max_value; }
68
69 void
70 release(ptrdiff_t __update = 1) noexcept(noexcept(_M_sem._M_release(1)))
71 { _M_sem._M_release(__update); }
72
73 void
74 acquire() noexcept(noexcept(_M_sem._M_acquire()))
75 { _M_sem._M_acquire(); }
76
77 bool
78 try_acquire() noexcept(noexcept(_M_sem._M_try_acquire()))
79 { return _M_sem._M_try_acquire(); }
80
81 template<typename _Rep, typename _Period>
82 bool
84 { return _M_sem._M_try_acquire_for(__rtime); }
85
86 template<typename _Clock, typename _Dur>
87 bool
89 { return _M_sem._M_try_acquire_until(__atime); }
90 };
91
92 using binary_semaphore = std::counting_semaphore<1>;
93
94_GLIBCXX_END_NAMESPACE_VERSION
95}
96#endif
97#endif
98#endif
ISO C++ entities toplevel namespace is std.
chrono::duration represents a distance between two points in time
chrono::time_point represents a point in time as measured by a clock