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| 1 | 13 | up20180614 | // -*- C++ -*- |
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| 2 | //===--------------------------- 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_MUTEX |
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| 12 | #define _LIBCPP_MUTEX |
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| 13 | |||
| 14 | /* |
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| 15 | mutex synopsis |
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| 16 | |||
| 17 | namespace std |
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| 18 | {
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| 19 | |||
| 20 | class mutex |
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| 21 | {
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| 22 | public: |
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| 23 | constexpr mutex() noexcept; |
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| 24 | ~mutex(); |
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| 25 | |||
| 26 | mutex(const mutex&) = delete; |
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| 27 | mutex& operator=(const mutex&) = delete; |
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| 28 | |||
| 29 | void lock(); |
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| 30 | bool try_lock(); |
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| 31 | void unlock(); |
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| 32 | |||
| 33 | typedef pthread_mutex_t* native_handle_type; |
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| 34 | native_handle_type native_handle(); |
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| 35 | }; |
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| 36 | |||
| 37 | class recursive_mutex |
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| 38 | {
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| 39 | public: |
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| 40 | recursive_mutex(); |
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| 41 | ~recursive_mutex(); |
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| 42 | |||
| 43 | recursive_mutex(const recursive_mutex&) = delete; |
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| 44 | recursive_mutex& operator=(const recursive_mutex&) = delete; |
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| 45 | |||
| 46 | void lock(); |
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| 47 | bool try_lock() noexcept; |
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| 48 | void unlock(); |
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| 49 | |||
| 50 | typedef pthread_mutex_t* native_handle_type; |
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| 51 | native_handle_type native_handle(); |
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| 52 | }; |
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| 53 | |||
| 54 | class timed_mutex |
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| 55 | {
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| 56 | public: |
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| 57 | timed_mutex(); |
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| 58 | ~timed_mutex(); |
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| 59 | |||
| 60 | timed_mutex(const timed_mutex&) = delete; |
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| 61 | timed_mutex& operator=(const timed_mutex&) = delete; |
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| 62 | |||
| 63 | void lock(); |
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| 64 | bool try_lock(); |
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| 65 | template <class Rep, class Period> |
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| 66 | bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); |
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| 67 | template <class Clock, class Duration> |
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| 68 | bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); |
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| 69 | void unlock(); |
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| 70 | }; |
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| 71 | |||
| 72 | class recursive_timed_mutex |
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| 73 | {
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| 74 | public: |
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| 75 | recursive_timed_mutex(); |
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| 76 | ~recursive_timed_mutex(); |
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| 77 | |||
| 78 | recursive_timed_mutex(const recursive_timed_mutex&) = delete; |
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| 79 | recursive_timed_mutex& operator=(const recursive_timed_mutex&) = delete; |
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| 80 | |||
| 81 | void lock(); |
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| 82 | bool try_lock() noexcept; |
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| 83 | template <class Rep, class Period> |
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| 84 | bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); |
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| 85 | template <class Clock, class Duration> |
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| 86 | bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); |
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| 87 | void unlock(); |
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| 88 | }; |
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| 89 | |||
| 90 | struct defer_lock_t {};
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| 91 | struct try_to_lock_t {};
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| 92 | struct adopt_lock_t {};
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| 93 | |||
| 94 | constexpr defer_lock_t defer_lock{};
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| 95 | constexpr try_to_lock_t try_to_lock{};
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| 96 | constexpr adopt_lock_t adopt_lock{};
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| 97 | |||
| 98 | template <class Mutex> |
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| 99 | class lock_guard |
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| 100 | {
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| 101 | public: |
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| 102 | typedef Mutex mutex_type; |
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| 103 | |||
| 104 | explicit lock_guard(mutex_type& m); |
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| 105 | lock_guard(mutex_type& m, adopt_lock_t); |
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| 106 | ~lock_guard(); |
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| 107 | |||
| 108 | lock_guard(lock_guard const&) = delete; |
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| 109 | lock_guard& operator=(lock_guard const&) = delete; |
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| 110 | }; |
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| 111 | |||
| 112 | template <class Mutex> |
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| 113 | class unique_lock |
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| 114 | {
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| 115 | public: |
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| 116 | typedef Mutex mutex_type; |
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| 117 | unique_lock() noexcept; |
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| 118 | explicit unique_lock(mutex_type& m); |
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| 119 | unique_lock(mutex_type& m, defer_lock_t) noexcept; |
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| 120 | unique_lock(mutex_type& m, try_to_lock_t); |
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| 121 | unique_lock(mutex_type& m, adopt_lock_t); |
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| 122 | template <class Clock, class Duration> |
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| 123 | unique_lock(mutex_type& m, const chrono::time_point<Clock, Duration>& abs_time); |
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| 124 | template <class Rep, class Period> |
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| 125 | unique_lock(mutex_type& m, const chrono::duration<Rep, Period>& rel_time); |
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| 126 | ~unique_lock(); |
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| 127 | |||
| 128 | unique_lock(unique_lock const&) = delete; |
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| 129 | unique_lock& operator=(unique_lock const&) = delete; |
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| 130 | |||
| 131 | unique_lock(unique_lock&& u) noexcept; |
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| 132 | unique_lock& operator=(unique_lock&& u) noexcept; |
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| 133 | |||
| 134 | void lock(); |
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| 135 | bool try_lock(); |
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| 136 | |||
| 137 | template <class Rep, class Period> |
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| 138 | bool try_lock_for(const chrono::duration<Rep, Period>& rel_time); |
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| 139 | template <class Clock, class Duration> |
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| 140 | bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time); |
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| 141 | |||
| 142 | void unlock(); |
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| 143 | |||
| 144 | void swap(unique_lock& u) noexcept; |
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| 145 | mutex_type* release() noexcept; |
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| 146 | |||
| 147 | bool owns_lock() const noexcept; |
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| 148 | explicit operator bool () const noexcept; |
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| 149 | mutex_type* mutex() const noexcept; |
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| 150 | }; |
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| 151 | |||
| 152 | template <class Mutex> |
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| 153 | void swap(unique_lock<Mutex>& x, unique_lock<Mutex>& y) noexcept; |
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| 154 | |||
| 155 | template <class L1, class L2, class... L3> |
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| 156 | int try_lock(L1&, L2&, L3&...); |
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| 157 | template <class L1, class L2, class... L3> |
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| 158 | void lock(L1&, L2&, L3&...); |
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| 159 | |||
| 160 | struct once_flag |
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| 161 | {
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| 162 | constexpr once_flag() noexcept; |
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| 163 | |||
| 164 | once_flag(const once_flag&) = delete; |
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| 165 | once_flag& operator=(const once_flag&) = delete; |
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| 166 | }; |
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| 167 | |||
| 168 | template<class Callable, class ...Args> |
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| 169 | void call_once(once_flag& flag, Callable&& func, Args&&... args); |
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| 170 | |||
| 171 | } // std |
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| 172 | |||
| 173 | */ |
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| 174 | |||
| 175 | #include <__config> |
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| 176 | #if !defined(_LIBCPP_HAS_NO_THREADS) && defined(__minix) |
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| 177 | #include <__mutex_base> |
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| 178 | #endif // !defined(_LIBCPP_HAS_NO_THREADS) && defined(__minix) |
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| 179 | #include <functional> |
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| 180 | #include <memory> |
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| 181 | #ifndef _LIBCPP_HAS_NO_VARIADICS |
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| 182 | #include <tuple> |
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| 183 | #endif |
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| 184 | #include <sched.h> |
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| 185 | |||
| 186 | #include <__undef_min_max> |
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| 187 | |||
| 188 | #if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER) |
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| 189 | #pragma GCC system_header |
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| 190 | #endif |
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| 191 | |||
| 192 | _LIBCPP_BEGIN_NAMESPACE_STD |
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| 193 | |||
| 194 | #ifndef _LIBCPP_HAS_NO_THREADS |
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| 195 | |||
| 196 | class _LIBCPP_TYPE_VIS recursive_mutex |
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| 197 | {
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| 198 | pthread_mutex_t __m_; |
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| 199 | |||
| 200 | public: |
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| 201 | recursive_mutex(); |
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| 202 | ~recursive_mutex(); |
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| 203 | |||
| 204 | private: |
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| 205 | recursive_mutex(const recursive_mutex&); // = delete; |
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| 206 | recursive_mutex& operator=(const recursive_mutex&); // = delete; |
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| 207 | |||
| 208 | public: |
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| 209 | void lock(); |
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| 210 | bool try_lock() _NOEXCEPT; |
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| 211 | void unlock() _NOEXCEPT; |
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| 212 | |||
| 213 | typedef pthread_mutex_t* native_handle_type; |
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| 214 | _LIBCPP_INLINE_VISIBILITY |
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| 215 | native_handle_type native_handle() {return &__m_;}
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| 216 | }; |
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| 217 | |||
| 218 | class _LIBCPP_TYPE_VIS timed_mutex |
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| 219 | {
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| 220 | mutex __m_; |
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| 221 | condition_variable __cv_; |
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| 222 | bool __locked_; |
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| 223 | public: |
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| 224 | timed_mutex(); |
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| 225 | ~timed_mutex(); |
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| 226 | |||
| 227 | private: |
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| 228 | timed_mutex(const timed_mutex&); // = delete; |
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| 229 | timed_mutex& operator=(const timed_mutex&); // = delete; |
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| 230 | |||
| 231 | public: |
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| 232 | void lock(); |
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| 233 | bool try_lock() _NOEXCEPT; |
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| 234 | template <class _Rep, class _Period> |
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| 235 | _LIBCPP_INLINE_VISIBILITY |
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| 236 | bool try_lock_for(const chrono::duration<_Rep, _Period>& __d) |
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| 237 | {return try_lock_until(chrono::steady_clock::now() + __d);}
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| 238 | template <class _Clock, class _Duration> |
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| 239 | bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t); |
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| 240 | void unlock() _NOEXCEPT; |
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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 | timed_mutex::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t) |
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| 246 | {
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| 247 | using namespace chrono; |
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| 248 | unique_lock<mutex> __lk(__m_); |
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| 249 | bool no_timeout = _Clock::now() < __t; |
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| 250 | while (no_timeout && __locked_) |
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| 251 | no_timeout = __cv_.wait_until(__lk, __t) == cv_status::no_timeout; |
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| 252 | if (!__locked_) |
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| 253 | {
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| 254 | __locked_ = true; |
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| 255 | return true; |
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| 256 | } |
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| 257 | return false; |
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| 258 | } |
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| 259 | |||
| 260 | class _LIBCPP_TYPE_VIS recursive_timed_mutex |
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| 261 | {
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| 262 | mutex __m_; |
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| 263 | condition_variable __cv_; |
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| 264 | size_t __count_; |
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| 265 | pthread_t __id_; |
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| 266 | public: |
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| 267 | recursive_timed_mutex(); |
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| 268 | ~recursive_timed_mutex(); |
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| 269 | |||
| 270 | private: |
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| 271 | recursive_timed_mutex(const recursive_timed_mutex&); // = delete; |
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| 272 | recursive_timed_mutex& operator=(const recursive_timed_mutex&); // = delete; |
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| 273 | |||
| 274 | public: |
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| 275 | void lock(); |
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| 276 | bool try_lock() _NOEXCEPT; |
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| 277 | template <class _Rep, class _Period> |
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| 278 | _LIBCPP_INLINE_VISIBILITY |
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| 279 | bool try_lock_for(const chrono::duration<_Rep, _Period>& __d) |
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| 280 | {return try_lock_until(chrono::steady_clock::now() + __d);}
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| 281 | template <class _Clock, class _Duration> |
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| 282 | bool try_lock_until(const chrono::time_point<_Clock, _Duration>& __t); |
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| 283 | void unlock() _NOEXCEPT; |
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| 284 | }; |
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| 285 | |||
| 286 | template <class _Clock, class _Duration> |
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| 287 | bool |
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| 288 | recursive_timed_mutex::try_lock_until(const chrono::time_point<_Clock, _Duration>& __t) |
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| 289 | {
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| 290 | using namespace chrono; |
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| 291 | pthread_t __id = pthread_self(); |
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| 292 | unique_lock<mutex> lk(__m_); |
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| 293 | if (pthread_equal(__id, __id_)) |
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| 294 | {
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| 295 | if (__count_ == numeric_limits<size_t>::max()) |
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| 296 | return false; |
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| 297 | ++__count_; |
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| 298 | return true; |
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| 299 | } |
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| 300 | bool no_timeout = _Clock::now() < __t; |
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| 301 | while (no_timeout && __count_ != 0) |
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| 302 | no_timeout = __cv_.wait_until(lk, __t) == cv_status::no_timeout; |
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| 303 | if (__count_ == 0) |
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| 304 | {
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| 305 | __count_ = 1; |
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| 306 | __id_ = __id; |
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| 307 | return true; |
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| 308 | } |
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| 309 | return false; |
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| 310 | } |
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| 311 | |||
| 312 | template <class _L0, class _L1> |
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| 313 | int |
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| 314 | try_lock(_L0& __l0, _L1& __l1) |
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| 315 | {
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| 316 | unique_lock<_L0> __u0(__l0, try_to_lock); |
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| 317 | if (__u0.owns_lock()) |
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| 318 | {
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| 319 | if (__l1.try_lock()) |
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| 320 | {
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| 321 | __u0.release(); |
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| 322 | return -1; |
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| 323 | } |
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| 324 | else |
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| 325 | return 1; |
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| 326 | } |
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| 327 | return 0; |
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| 328 | } |
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| 329 | |||
| 330 | #ifndef _LIBCPP_HAS_NO_VARIADICS |
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| 331 | |||
| 332 | template <class _L0, class _L1, class _L2, class... _L3> |
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| 333 | int |
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| 334 | try_lock(_L0& __l0, _L1& __l1, _L2& __l2, _L3&... __l3) |
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| 335 | {
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| 336 | int __r = 0; |
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| 337 | unique_lock<_L0> __u0(__l0, try_to_lock); |
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| 338 | if (__u0.owns_lock()) |
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| 339 | {
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| 340 | __r = try_lock(__l1, __l2, __l3...); |
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| 341 | if (__r == -1) |
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| 342 | __u0.release(); |
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| 343 | else |
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| 344 | ++__r; |
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| 345 | } |
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| 346 | return __r; |
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| 347 | } |
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| 348 | |||
| 349 | #endif // _LIBCPP_HAS_NO_VARIADICS |
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| 350 | |||
| 351 | template <class _L0, class _L1> |
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| 352 | void |
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| 353 | lock(_L0& __l0, _L1& __l1) |
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| 354 | {
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| 355 | while (true) |
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| 356 | {
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| 357 | {
|
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| 358 | unique_lock<_L0> __u0(__l0); |
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| 359 | if (__l1.try_lock()) |
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| 360 | {
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| 361 | __u0.release(); |
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| 362 | break; |
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| 363 | } |
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| 364 | } |
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| 365 | sched_yield(); |
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| 366 | {
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| 367 | unique_lock<_L1> __u1(__l1); |
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| 368 | if (__l0.try_lock()) |
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| 369 | {
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| 370 | __u1.release(); |
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| 371 | break; |
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| 372 | } |
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| 373 | } |
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| 374 | sched_yield(); |
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| 375 | } |
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| 376 | } |
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| 377 | |||
| 378 | #ifndef _LIBCPP_HAS_NO_VARIADICS |
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| 379 | |||
| 380 | template <class _L0, class _L1, class _L2, class ..._L3> |
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| 381 | void |
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| 382 | __lock_first(int __i, _L0& __l0, _L1& __l1, _L2& __l2, _L3& ...__l3) |
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| 383 | {
|
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| 384 | while (true) |
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| 385 | {
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| 386 | switch (__i) |
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| 387 | {
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| 388 | case 0: |
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| 389 | {
|
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| 390 | unique_lock<_L0> __u0(__l0); |
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| 391 | __i = try_lock(__l1, __l2, __l3...); |
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| 392 | if (__i == -1) |
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| 393 | {
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| 394 | __u0.release(); |
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| 395 | return; |
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| 396 | } |
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| 397 | } |
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| 398 | ++__i; |
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| 399 | sched_yield(); |
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| 400 | break; |
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| 401 | case 1: |
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| 402 | {
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| 403 | unique_lock<_L1> __u1(__l1); |
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| 404 | __i = try_lock(__l2, __l3..., __l0); |
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| 405 | if (__i == -1) |
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| 406 | {
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| 407 | __u1.release(); |
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| 408 | return; |
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| 409 | } |
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| 410 | } |
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| 411 | if (__i == sizeof...(_L3) + 1) |
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| 412 | __i = 0; |
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| 413 | else |
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| 414 | __i += 2; |
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| 415 | sched_yield(); |
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| 416 | break; |
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| 417 | default: |
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| 418 | __lock_first(__i - 2, __l2, __l3..., __l0, __l1); |
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| 419 | return; |
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| 420 | } |
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| 421 | } |
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| 422 | } |
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| 423 | |||
| 424 | template <class _L0, class _L1, class _L2, class ..._L3> |
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| 425 | inline _LIBCPP_INLINE_VISIBILITY |
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| 426 | void |
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| 427 | lock(_L0& __l0, _L1& __l1, _L2& __l2, _L3& ...__l3) |
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| 428 | {
|
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| 429 | __lock_first(0, __l0, __l1, __l2, __l3...); |
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| 430 | } |
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| 431 | |||
| 432 | #endif // _LIBCPP_HAS_NO_VARIADICS |
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| 433 | |||
| 434 | #endif // !_LIBCPP_HAS_NO_THREADS |
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| 435 | |||
| 436 | struct _LIBCPP_TYPE_VIS_ONLY once_flag; |
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| 437 | |||
| 438 | #ifndef _LIBCPP_HAS_NO_VARIADICS |
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| 439 | |||
| 440 | template<class _Callable, class... _Args> |
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| 441 | _LIBCPP_INLINE_VISIBILITY |
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| 442 | void call_once(once_flag&, _Callable&&, _Args&&...); |
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| 443 | |||
| 444 | #else // _LIBCPP_HAS_NO_VARIADICS |
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| 445 | |||
| 446 | template<class _Callable> |
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| 447 | _LIBCPP_INLINE_VISIBILITY |
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| 448 | void call_once(once_flag&, _Callable&); |
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| 449 | |||
| 450 | template<class _Callable> |
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| 451 | _LIBCPP_INLINE_VISIBILITY |
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| 452 | void call_once(once_flag&, const _Callable&); |
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| 453 | |||
| 454 | #endif // _LIBCPP_HAS_NO_VARIADICS |
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| 455 | |||
| 456 | struct _LIBCPP_TYPE_VIS_ONLY once_flag |
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| 457 | {
|
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| 458 | _LIBCPP_INLINE_VISIBILITY |
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| 459 | _LIBCPP_CONSTEXPR |
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| 460 | once_flag() _NOEXCEPT : __state_(0) {}
|
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| 461 | |||
| 462 | private: |
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| 463 | once_flag(const once_flag&); // = delete; |
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| 464 | once_flag& operator=(const once_flag&); // = delete; |
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| 465 | |||
| 466 | unsigned long __state_; |
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| 467 | |||
| 468 | #ifndef _LIBCPP_HAS_NO_VARIADICS |
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| 469 | template<class _Callable, class... _Args> |
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| 470 | friend |
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| 471 | void call_once(once_flag&, _Callable&&, _Args&&...); |
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| 472 | #else // _LIBCPP_HAS_NO_VARIADICS |
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| 473 | template<class _Callable> |
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| 474 | friend |
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| 475 | void call_once(once_flag&, _Callable&); |
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| 476 | |||
| 477 | template<class _Callable> |
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| 478 | friend |
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| 479 | void call_once(once_flag&, const _Callable&); |
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| 480 | #endif // _LIBCPP_HAS_NO_VARIADICS |
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| 481 | }; |
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| 482 | |||
| 483 | #ifndef _LIBCPP_HAS_NO_VARIADICS |
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| 484 | |||
| 485 | template <class _Fp> |
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| 486 | class __call_once_param |
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| 487 | {
|
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| 488 | _Fp& __f_; |
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| 489 | public: |
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| 490 | _LIBCPP_INLINE_VISIBILITY |
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| 491 | explicit __call_once_param(_Fp& __f) : __f_(__f) {}
|
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| 492 | |||
| 493 | _LIBCPP_INLINE_VISIBILITY |
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| 494 | void operator()() |
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| 495 | {
|
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| 496 | typedef typename __make_tuple_indices<tuple_size<_Fp>::value, 1>::type _Index; |
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| 497 | __execute(_Index()); |
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| 498 | } |
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| 499 | |||
| 500 | private: |
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| 501 | template <size_t ..._Indices> |
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| 502 | _LIBCPP_INLINE_VISIBILITY |
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| 503 | void __execute(__tuple_indices<_Indices...>) |
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| 504 | {
|
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| 505 | __invoke(_VSTD::get<0>(_VSTD::move(__f_)), _VSTD::get<_Indices>(_VSTD::move(__f_))...); |
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| 506 | } |
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| 507 | }; |
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| 508 | |||
| 509 | #else |
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| 510 | |||
| 511 | template <class _Fp> |
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| 512 | class __call_once_param |
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| 513 | {
|
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| 514 | _Fp& __f_; |
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| 515 | public: |
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| 516 | _LIBCPP_INLINE_VISIBILITY |
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| 517 | explicit __call_once_param(_Fp& __f) : __f_(__f) {}
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| 518 | |||
| 519 | _LIBCPP_INLINE_VISIBILITY |
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| 520 | void operator()() |
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| 521 | {
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| 522 | __f_(); |
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| 523 | } |
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| 524 | }; |
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| 525 | |||
| 526 | #endif |
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| 527 | |||
| 528 | template <class _Fp> |
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| 529 | void |
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| 530 | __call_once_proxy(void* __vp) |
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| 531 | {
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| 532 | __call_once_param<_Fp>* __p = static_cast<__call_once_param<_Fp>*>(__vp); |
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| 533 | (*__p)(); |
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| 534 | } |
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| 535 | |||
| 536 | _LIBCPP_FUNC_VIS void __call_once(volatile unsigned long&, void*, void(*)(void*)); |
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| 537 | |||
| 538 | #ifndef _LIBCPP_HAS_NO_VARIADICS |
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| 539 | |||
| 540 | template<class _Callable, class... _Args> |
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| 541 | inline _LIBCPP_INLINE_VISIBILITY |
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| 542 | void |
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| 543 | call_once(once_flag& __flag, _Callable&& __func, _Args&&... __args) |
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| 544 | {
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| 545 | if (__libcpp_relaxed_load(&__flag.__state_) != ~0ul) |
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| 546 | {
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| 547 | typedef tuple<_Callable&&, _Args&&...> _Gp; |
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| 548 | _Gp __f(_VSTD::forward<_Callable>(__func), _VSTD::forward<_Args>(__args)...); |
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| 549 | __call_once_param<_Gp> __p(__f); |
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| 550 | __call_once(__flag.__state_, &__p, &__call_once_proxy<_Gp>); |
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| 551 | } |
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| 552 | } |
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| 553 | |||
| 554 | #else // _LIBCPP_HAS_NO_VARIADICS |
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| 555 | |||
| 556 | template<class _Callable> |
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| 557 | inline _LIBCPP_INLINE_VISIBILITY |
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| 558 | void |
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| 559 | call_once(once_flag& __flag, _Callable& __func) |
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| 560 | {
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| 561 | if (__libcpp_relaxed_load(&__flag.__state_) != ~0ul) |
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| 562 | {
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| 563 | __call_once_param<_Callable> __p(__func); |
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| 564 | __call_once(__flag.__state_, &__p, &__call_once_proxy<_Callable>); |
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| 565 | } |
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| 566 | } |
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| 567 | |||
| 568 | template<class _Callable> |
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| 569 | inline _LIBCPP_INLINE_VISIBILITY |
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| 570 | void |
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| 571 | call_once(once_flag& __flag, const _Callable& __func) |
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| 572 | {
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| 573 | if (__flag.__state_ != ~0ul) |
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| 574 | {
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| 575 | __call_once_param<const _Callable> __p(__func); |
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| 576 | __call_once(__flag.__state_, &__p, &__call_once_proxy<const _Callable>); |
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| 577 | } |
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| 578 | } |
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| 579 | |||
| 580 | #endif // _LIBCPP_HAS_NO_VARIADICS |
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| 581 | |||
| 582 | _LIBCPP_END_NAMESPACE_STD |
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| 583 | |||
| 584 | #endif // _LIBCPP_MUTEX |