root / lab4 / .minix-src / include / c++ / shared_mutex
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| 1 | 13 | up20180614 | // -*- C++ -*- |
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| 2 | //===------------------------ shared_mutex --------------------------------===// |
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| 3 | // |
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| 4 | // The LLVM Compiler Infrastructure |
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| 5 | // |
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| 6 | // This file is dual licensed under the MIT and the University of Illinois Open |
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| 7 | // Source Licenses. See LICENSE.TXT for details. |
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| 8 | // |
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| 9 | //===----------------------------------------------------------------------===// |
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| 10 | |||
| 11 | #ifndef _LIBCPP_SHARED_MUTEX |
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| 12 | #define _LIBCPP_SHARED_MUTEX |
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| 13 | |||
| 14 | /* |
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| 15 | shared_mutex synopsis |
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| 16 | |||
| 17 | // C++1y |
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| 18 | |||
| 19 | namespace std |
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| 20 | {
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| 21 | |||
| 22 | class shared_mutex // C++17 |
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| 23 | {
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| 24 | public: |
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| 25 | shared_mutex(); |
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| 26 | ~shared_mutex(); |
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| 27 | |||
| 28 | shared_mutex(const shared_mutex&) = delete; |
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| 29 | shared_mutex& operator=(const shared_mutex&) = delete; |
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| 30 | |||
| 31 | // Exclusive ownership |
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| 32 | void lock(); // blocking |
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| 33 | bool try_lock(); |
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| 34 | void unlock(); |
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| 35 | |||
| 36 | // Shared ownership |
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| 37 | void lock_shared(); // blocking |
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| 38 | bool try_lock_shared(); |
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| 39 | void unlock_shared(); |
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| 40 | |||
| 41 | typedef implementation-defined native_handle_type; // See 30.2.3 |
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| 42 | native_handle_type native_handle(); // See 30.2.3 |
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| 43 | }; |
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| 44 | |||
| 45 | class shared_timed_mutex |
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| 46 | {
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| 47 | public: |
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| 48 | shared_timed_mutex(); |
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| 49 | ~shared_timed_mutex(); |
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| 50 | |||
| 51 | shared_timed_mutex(const shared_timed_mutex&) = delete; |
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| 52 | shared_timed_mutex& operator=(const shared_timed_mutex&) = delete; |
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| 53 | |||
| 54 | // Exclusive ownership |
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| 55 | void lock(); // blocking |
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| 56 | bool try_lock(); |
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| 57 | template <class Rep, class Period> |
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| 58 | bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); |
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| 59 | template <class Clock, class Duration> |
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| 60 | bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); |
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| 61 | void unlock(); |
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| 62 | |||
| 63 | // Shared ownership |
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| 64 | void lock_shared(); // blocking |
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| 65 | bool try_lock_shared(); |
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| 66 | template <class Rep, class Period> |
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| 67 | bool |
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| 68 | try_lock_shared_for(const chrono::duration<Rep, Period>& rel_time); |
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| 69 | template <class Clock, class Duration> |
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| 70 | bool |
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| 71 | try_lock_shared_until(const chrono::time_point<Clock, Duration>& abs_time); |
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| 72 | void unlock_shared(); |
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| 73 | }; |
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| 74 | |||
| 75 | template <class Mutex> |
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| 76 | class shared_lock |
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| 77 | {
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| 78 | public: |
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| 79 | typedef Mutex mutex_type; |
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| 80 | |||
| 81 | // Shared locking |
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| 82 | shared_lock() noexcept; |
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| 83 | explicit shared_lock(mutex_type& m); // blocking |
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| 84 | shared_lock(mutex_type& m, defer_lock_t) noexcept; |
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| 85 | shared_lock(mutex_type& m, try_to_lock_t); |
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| 86 | shared_lock(mutex_type& m, adopt_lock_t); |
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| 87 | template <class Clock, class Duration> |
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| 88 | shared_lock(mutex_type& m, |
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| 89 | const chrono::time_point<Clock, Duration>& abs_time); |
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| 90 | template <class Rep, class Period> |
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| 91 | shared_lock(mutex_type& m, |
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| 92 | const chrono::duration<Rep, Period>& rel_time); |
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| 93 | ~shared_lock(); |
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| 94 | |||
| 95 | shared_lock(shared_lock const&) = delete; |
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| 96 | shared_lock& operator=(shared_lock const&) = delete; |
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| 97 | |||
| 98 | shared_lock(shared_lock&& u) noexcept; |
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| 99 | shared_lock& operator=(shared_lock&& u) noexcept; |
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| 100 | |||
| 101 | void lock(); // blocking |
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| 102 | bool try_lock(); |
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| 103 | template <class Rep, class Period> |
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| 104 | bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); |
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| 105 | template <class Clock, class Duration> |
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| 106 | bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); |
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| 107 | void unlock(); |
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| 108 | |||
| 109 | // Setters |
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| 110 | void swap(shared_lock& u) noexcept; |
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| 111 | mutex_type* release() noexcept; |
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| 112 | |||
| 113 | // Getters |
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| 114 | bool owns_lock() const noexcept; |
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| 115 | explicit operator bool () const noexcept; |
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| 116 | mutex_type* mutex() const noexcept; |
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| 117 | }; |
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| 118 | |||
| 119 | template <class Mutex> |
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| 120 | void swap(shared_lock<Mutex>& x, shared_lock<Mutex>& y) noexcept; |
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| 121 | |||
| 122 | } // std |
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| 123 | |||
| 124 | */ |
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| 125 | |||
| 126 | #include <__config> |
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| 127 | |||
| 128 | #if _LIBCPP_STD_VER > 11 || defined(_LIBCPP_BUILDING_SHARED_MUTEX) |
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| 129 | |||
| 130 | #include <__mutex_base> |
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| 131 | |||
| 132 | #include <__undef_min_max> |
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| 133 | |||
| 134 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
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| 135 | #pragma GCC system_header |
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| 136 | #endif |
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| 137 | |||
| 138 | #ifdef _LIBCPP_HAS_NO_THREADS |
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| 139 | #error <shared_mutex> is not supported on this single threaded system |
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| 140 | #else // !_LIBCPP_HAS_NO_THREADS |
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| 141 | |||
| 142 | _LIBCPP_BEGIN_NAMESPACE_STD |
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| 143 | |||
| 144 | struct _LIBCPP_TYPE_VIS __shared_mutex_base |
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| 145 | {
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| 146 | mutex __mut_; |
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| 147 | condition_variable __gate1_; |
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| 148 | condition_variable __gate2_; |
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| 149 | unsigned __state_; |
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| 150 | |||
| 151 | static const unsigned __write_entered_ = 1U << (sizeof(unsigned)*__CHAR_BIT__ - 1); |
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| 152 | static const unsigned __n_readers_ = ~__write_entered_; |
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| 153 | |||
| 154 | __shared_mutex_base(); |
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| 155 | _LIBCPP_INLINE_VISIBILITY ~__shared_mutex_base() = default; |
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| 156 | |||
| 157 | __shared_mutex_base(const __shared_mutex_base&) = delete; |
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| 158 | __shared_mutex_base& operator=(const __shared_mutex_base&) = delete; |
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| 159 | |||
| 160 | // Exclusive ownership |
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| 161 | void lock(); // blocking |
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| 162 | bool try_lock(); |
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| 163 | void unlock(); |
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| 164 | |||
| 165 | // Shared ownership |
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| 166 | void lock_shared(); // blocking |
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| 167 | bool try_lock_shared(); |
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| 168 | void unlock_shared(); |
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| 169 | |||
| 170 | // typedef implementation-defined native_handle_type; // See 30.2.3 |
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| 171 | // native_handle_type native_handle(); // See 30.2.3 |
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| 172 | }; |
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| 173 | |||
| 174 | |||
| 175 | #if _LIBCPP_STD_VER > 14 |
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| 176 | class _LIBCPP_TYPE_VIS shared_mutex |
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| 177 | {
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| 178 | __shared_mutex_base __base; |
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| 179 | public: |
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| 180 | shared_mutex() : __base() {}
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| 181 | _LIBCPP_INLINE_VISIBILITY ~shared_mutex() = default; |
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| 182 | |||
| 183 | shared_mutex(const shared_mutex&) = delete; |
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| 184 | shared_mutex& operator=(const shared_mutex&) = delete; |
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| 185 | |||
| 186 | // Exclusive ownership |
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| 187 | _LIBCPP_INLINE_VISIBILITY void lock() { return __base.lock(); }
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| 188 | _LIBCPP_INLINE_VISIBILITY bool try_lock() { return __base.try_lock(); }
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| 189 | _LIBCPP_INLINE_VISIBILITY void unlock() { return __base.unlock(); }
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| 190 | |||
| 191 | // Shared ownership |
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| 192 | _LIBCPP_INLINE_VISIBILITY void lock_shared() { return __base.lock_shared(); }
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| 193 | _LIBCPP_INLINE_VISIBILITY bool try_lock_shared() { return __base.try_lock_shared(); }
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| 194 | _LIBCPP_INLINE_VISIBILITY void unlock_shared() { return __base.unlock_shared(); }
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| 195 | |||
| 196 | // typedef __shared_mutex_base::native_handle_type native_handle_type; |
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| 197 | // _LIBCPP_INLINE_VISIBILITY native_handle_type native_handle() { return __base::unlock_shared(); }
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| 198 | }; |
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| 199 | #endif |
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| 200 | |||
| 201 | |||
| 202 | class _LIBCPP_TYPE_VIS shared_timed_mutex |
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| 203 | {
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| 204 | __shared_mutex_base __base; |
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| 205 | public: |
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| 206 | shared_timed_mutex(); |
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| 207 | _LIBCPP_INLINE_VISIBILITY ~shared_timed_mutex() = default; |
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| 208 | |||
| 209 | shared_timed_mutex(const shared_timed_mutex&) = delete; |
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| 210 | shared_timed_mutex& operator=(const shared_timed_mutex&) = delete; |
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| 211 | |||
| 212 | // Exclusive ownership |
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| 213 | void lock(); |
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| 214 | bool try_lock(); |
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| 215 | template <class _Rep, class _Period> |
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| 216 | _LIBCPP_INLINE_VISIBILITY |
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| 217 | bool |
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| 218 | try_lock_for(const chrono::duration<_Rep, _Period>& __rel_time) |
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| 219 | {
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| 220 | return try_lock_until(chrono::steady_clock::now() + __rel_time); |
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| 221 | } |
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| 222 | template <class _Clock, class _Duration> |
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| 223 | bool |
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| 224 | try_lock_until(const chrono::time_point<_Clock, _Duration>& __abs_time); |
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| 225 | void unlock(); |
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| 226 | |||
| 227 | // Shared ownership |
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| 228 | void lock_shared(); |
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| 229 | bool try_lock_shared(); |
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| 230 | template <class _Rep, class _Period> |
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| 231 | _LIBCPP_INLINE_VISIBILITY |
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| 232 | bool |
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| 233 | try_lock_shared_for(const chrono::duration<_Rep, _Period>& __rel_time) |
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| 234 | {
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| 235 | return try_lock_shared_until(chrono::steady_clock::now() + __rel_time); |
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| 236 | } |
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| 237 | template <class _Clock, class _Duration> |
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| 238 | bool |
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| 239 | try_lock_shared_until(const chrono::time_point<_Clock, _Duration>& __abs_time); |
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| 240 | void unlock_shared(); |
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| 241 | }; |
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| 242 | |||
| 243 | template <class _Clock, class _Duration> |
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| 244 | bool |
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| 245 | shared_timed_mutex::try_lock_until( |
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| 246 | const chrono::time_point<_Clock, _Duration>& __abs_time) |
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| 247 | {
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| 248 | unique_lock<mutex> __lk(__base.__mut_); |
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| 249 | if (__base.__state_ & __base.__write_entered_) |
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| 250 | {
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| 251 | while (true) |
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| 252 | {
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| 253 | cv_status __status = __base.__gate1_.wait_until(__lk, __abs_time); |
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| 254 | if ((__base.__state_ & __base.__write_entered_) == 0) |
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| 255 | break; |
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| 256 | if (__status == cv_status::timeout) |
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| 257 | return false; |
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| 258 | } |
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| 259 | } |
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| 260 | __base.__state_ |= __base.__write_entered_; |
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| 261 | if (__base.__state_ & __base.__n_readers_) |
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| 262 | {
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| 263 | while (true) |
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| 264 | {
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| 265 | cv_status __status = __base.__gate2_.wait_until(__lk, __abs_time); |
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| 266 | if ((__base.__state_ & __base.__n_readers_) == 0) |
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| 267 | break; |
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| 268 | if (__status == cv_status::timeout) |
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| 269 | {
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| 270 | __base.__state_ &= ~__base.__write_entered_; |
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| 271 | __base.__gate1_.notify_all(); |
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| 272 | return false; |
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| 273 | } |
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| 274 | } |
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| 275 | } |
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| 276 | return true; |
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| 277 | } |
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| 278 | |||
| 279 | template <class _Clock, class _Duration> |
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| 280 | bool |
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| 281 | shared_timed_mutex::try_lock_shared_until( |
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| 282 | const chrono::time_point<_Clock, _Duration>& __abs_time) |
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| 283 | {
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| 284 | unique_lock<mutex> __lk(__base.__mut_); |
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| 285 | if ((__base.__state_ & __base.__write_entered_) || (__base.__state_ & __base.__n_readers_) == __base.__n_readers_) |
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| 286 | {
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| 287 | while (true) |
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| 288 | {
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| 289 | cv_status status = __base.__gate1_.wait_until(__lk, __abs_time); |
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| 290 | if ((__base.__state_ & __base.__write_entered_) == 0 && |
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| 291 | (__base.__state_ & __base.__n_readers_) < __base.__n_readers_) |
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| 292 | break; |
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| 293 | if (status == cv_status::timeout) |
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| 294 | return false; |
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| 295 | } |
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| 296 | } |
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| 297 | unsigned __num_readers = (__base.__state_ & __base.__n_readers_) + 1; |
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| 298 | __base.__state_ &= ~__base.__n_readers_; |
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| 299 | __base.__state_ |= __num_readers; |
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| 300 | return true; |
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| 301 | } |
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| 302 | |||
| 303 | template <class _Mutex> |
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| 304 | class shared_lock |
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| 305 | {
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| 306 | public: |
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| 307 | typedef _Mutex mutex_type; |
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| 308 | |||
| 309 | private: |
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| 310 | mutex_type* __m_; |
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| 311 | bool __owns_; |
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| 312 | |||
| 313 | public: |
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| 314 | _LIBCPP_INLINE_VISIBILITY |
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| 315 | shared_lock() _NOEXCEPT |
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| 316 | : __m_(nullptr), |
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| 317 | __owns_(false) |
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| 318 | {}
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| 319 | |||
| 320 | _LIBCPP_INLINE_VISIBILITY |
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| 321 | explicit shared_lock(mutex_type& __m) |
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| 322 | : __m_(&__m), |
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| 323 | __owns_(true) |
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| 324 | {__m_->lock_shared();}
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| 325 | |||
| 326 | _LIBCPP_INLINE_VISIBILITY |
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| 327 | shared_lock(mutex_type& __m, defer_lock_t) _NOEXCEPT |
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| 328 | : __m_(&__m), |
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| 329 | __owns_(false) |
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| 330 | {}
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| 331 | |||
| 332 | _LIBCPP_INLINE_VISIBILITY |
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| 333 | shared_lock(mutex_type& __m, try_to_lock_t) |
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| 334 | : __m_(&__m), |
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| 335 | __owns_(__m.try_lock_shared()) |
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| 336 | {}
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| 337 | |||
| 338 | _LIBCPP_INLINE_VISIBILITY |
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| 339 | shared_lock(mutex_type& __m, adopt_lock_t) |
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| 340 | : __m_(&__m), |
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| 341 | __owns_(true) |
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| 342 | {}
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| 343 | |||
| 344 | template <class _Clock, class _Duration> |
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| 345 | _LIBCPP_INLINE_VISIBILITY |
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| 346 | shared_lock(mutex_type& __m, |
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| 347 | const chrono::time_point<_Clock, _Duration>& __abs_time) |
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| 348 | : __m_(&__m), |
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| 349 | __owns_(__m.try_lock_shared_until(__abs_time)) |
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| 350 | {}
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| 351 | |||
| 352 | template <class _Rep, class _Period> |
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| 353 | _LIBCPP_INLINE_VISIBILITY |
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| 354 | shared_lock(mutex_type& __m, |
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| 355 | const chrono::duration<_Rep, _Period>& __rel_time) |
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| 356 | : __m_(&__m), |
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| 357 | __owns_(__m.try_lock_shared_for(__rel_time)) |
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| 358 | {}
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| 359 | |||
| 360 | _LIBCPP_INLINE_VISIBILITY |
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| 361 | ~shared_lock() |
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| 362 | {
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| 363 | if (__owns_) |
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| 364 | __m_->unlock_shared(); |
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| 365 | } |
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| 366 | |||
| 367 | shared_lock(shared_lock const&) = delete; |
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| 368 | shared_lock& operator=(shared_lock const&) = delete; |
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| 369 | |||
| 370 | _LIBCPP_INLINE_VISIBILITY |
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| 371 | shared_lock(shared_lock&& __u) _NOEXCEPT |
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| 372 | : __m_(__u.__m_), |
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| 373 | __owns_(__u.__owns_) |
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| 374 | {
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| 375 | __u.__m_ = nullptr; |
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| 376 | __u.__owns_ = false; |
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| 377 | } |
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| 378 | |||
| 379 | _LIBCPP_INLINE_VISIBILITY |
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| 380 | shared_lock& operator=(shared_lock&& __u) _NOEXCEPT |
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| 381 | {
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| 382 | if (__owns_) |
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| 383 | __m_->unlock_shared(); |
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| 384 | __m_ = nullptr; |
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| 385 | __owns_ = false; |
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| 386 | __m_ = __u.__m_; |
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| 387 | __owns_ = __u.__owns_; |
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| 388 | __u.__m_ = nullptr; |
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| 389 | __u.__owns_ = false; |
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| 390 | return *this; |
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| 391 | } |
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| 392 | |||
| 393 | void lock(); |
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| 394 | bool try_lock(); |
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| 395 | template <class Rep, class Period> |
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| 396 | bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); |
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| 397 | template <class Clock, class Duration> |
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| 398 | bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); |
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| 399 | void unlock(); |
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| 400 | |||
| 401 | // Setters |
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| 402 | _LIBCPP_INLINE_VISIBILITY |
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| 403 | void swap(shared_lock& __u) _NOEXCEPT |
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| 404 | {
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| 405 | _VSTD::swap(__m_, __u.__m_); |
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| 406 | _VSTD::swap(__owns_, __u.__owns_); |
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| 407 | } |
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| 408 | |||
| 409 | _LIBCPP_INLINE_VISIBILITY |
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| 410 | mutex_type* release() _NOEXCEPT |
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| 411 | {
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| 412 | mutex_type* __m = __m_; |
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| 413 | __m_ = nullptr; |
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| 414 | __owns_ = false; |
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| 415 | return __m; |
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| 416 | } |
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| 417 | |||
| 418 | // Getters |
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| 419 | _LIBCPP_INLINE_VISIBILITY |
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| 420 | bool owns_lock() const _NOEXCEPT {return __owns_;}
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| 421 | |||
| 422 | _LIBCPP_INLINE_VISIBILITY |
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| 423 | explicit operator bool () const _NOEXCEPT {return __owns_;}
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| 424 | |||
| 425 | _LIBCPP_INLINE_VISIBILITY |
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| 426 | mutex_type* mutex() const _NOEXCEPT {return __m_;}
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| 427 | }; |
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| 428 | |||
| 429 | template <class _Mutex> |
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| 430 | void |
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| 431 | shared_lock<_Mutex>::lock() |
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| 432 | {
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| 433 | if (__m_ == nullptr) |
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| 434 | __throw_system_error(EPERM, "shared_lock::lock: references null mutex"); |
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| 435 | if (__owns_) |
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| 436 | __throw_system_error(EDEADLK, "shared_lock::lock: already locked"); |
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| 437 | __m_->lock_shared(); |
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| 438 | __owns_ = true; |
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| 439 | } |
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| 440 | |||
| 441 | template <class _Mutex> |
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| 442 | bool |
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| 443 | shared_lock<_Mutex>::try_lock() |
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| 444 | {
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| 445 | if (__m_ == nullptr) |
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| 446 | __throw_system_error(EPERM, "shared_lock::try_lock: references null mutex"); |
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| 447 | if (__owns_) |
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| 448 | __throw_system_error(EDEADLK, "shared_lock::try_lock: already locked"); |
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| 449 | __owns_ = __m_->try_lock_shared(); |
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| 450 | return __owns_; |
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| 451 | } |
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| 452 | |||
| 453 | template <class _Mutex> |
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| 454 | template <class _Rep, class _Period> |
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| 455 | bool |
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| 456 | shared_lock<_Mutex>::try_lock_for(const chrono::duration<_Rep, _Period>& __d) |
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| 457 | {
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| 458 | if (__m_ == nullptr) |
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| 459 | __throw_system_error(EPERM, "shared_lock::try_lock_for: references null mutex"); |
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| 460 | if (__owns_) |
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| 461 | __throw_system_error(EDEADLK, "shared_lock::try_lock_for: already locked"); |
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| 462 | __owns_ = __m_->try_lock_shared_for(__d); |
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| 463 | return __owns_; |
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| 464 | } |
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| 465 | |||
| 466 | template <class _Mutex> |
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| 467 | template <class _Clock, class _Duration> |
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| 468 | bool |
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| 469 | shared_lock<_Mutex>::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t) |
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| 470 | {
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| 471 | if (__m_ == nullptr) |
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| 472 | __throw_system_error(EPERM, "shared_lock::try_lock_until: references null mutex"); |
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| 473 | if (__owns_) |
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| 474 | __throw_system_error(EDEADLK, "shared_lock::try_lock_until: already locked"); |
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| 475 | __owns_ = __m_->try_lock_shared_until(__t); |
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| 476 | return __owns_; |
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| 477 | } |
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| 478 | |||
| 479 | template <class _Mutex> |
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| 480 | void |
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| 481 | shared_lock<_Mutex>::unlock() |
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| 482 | {
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| 483 | if (!__owns_) |
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| 484 | __throw_system_error(EPERM, "shared_lock::unlock: not locked"); |
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| 485 | __m_->unlock_shared(); |
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| 486 | __owns_ = false; |
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| 487 | } |
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| 488 | |||
| 489 | template <class _Mutex> |
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| 490 | inline _LIBCPP_INLINE_VISIBILITY |
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| 491 | void |
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| 492 | swap(shared_lock<_Mutex>& __x, shared_lock<_Mutex>& __y) _NOEXCEPT |
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| 493 | {__x.swap(__y);}
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| 494 | |||
| 495 | _LIBCPP_END_NAMESPACE_STD |
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| 496 | |||
| 497 | #endif // !_LIBCPP_HAS_NO_THREADS |
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| 498 | |||
| 499 | #endif // _LIBCPP_STD_VER > 11 |
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| 500 | |||
| 501 | #endif // _LIBCPP_SHARED_MUTEX |