chromium/third_party/libc++/src/include/shared_mutex

// -*- C++ -*-
//===----------------------------------------------------------------------===//
//
// Part of the LLVM Project, under the Apache License v2.0 with LLVM Exceptions.
// See https://llvm.org/LICENSE.txt for license information.
// SPDX-License-Identifier: Apache-2.0 WITH LLVM-exception
//
//===----------------------------------------------------------------------===//

#ifndef _LIBCPP_SHARED_MUTEX
#define _LIBCPP_SHARED_MUTEX

/*
    shared_mutex synopsis

// C++1y

namespace std
{

class shared_mutex      // C++17
{
public:
    shared_mutex();
    ~shared_mutex();

    shared_mutex(const shared_mutex&) = delete;
    shared_mutex& operator=(const shared_mutex&) = delete;

    // Exclusive ownership
    void lock(); // blocking
    bool try_lock();
    void unlock();

    // Shared ownership
    void lock_shared(); // blocking
    bool try_lock_shared();
    void unlock_shared();

    typedef implementation-defined native_handle_type; // See 30.2.3
    native_handle_type native_handle(); // See 30.2.3
};

class shared_timed_mutex
{
public:
    shared_timed_mutex();
    ~shared_timed_mutex();

    shared_timed_mutex(const shared_timed_mutex&) = delete;
    shared_timed_mutex& operator=(const shared_timed_mutex&) = delete;

    // Exclusive ownership
    void lock(); // blocking
    bool try_lock();
    template <class Rep, class Period>
        bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
    template <class Clock, class Duration>
        bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
    void unlock();

    // Shared ownership
    void lock_shared(); // blocking
    bool try_lock_shared();
    template <class Rep, class Period>
        bool
        try_lock_shared_for(const chrono::duration<Rep, Period>& rel_time);
    template <class Clock, class Duration>
        bool
        try_lock_shared_until(const chrono::time_point<Clock, Duration>& abs_time);
    void unlock_shared();
};

template <class Mutex>
class shared_lock
{
public:
    typedef Mutex mutex_type;

    // Shared locking
    shared_lock() noexcept;
    explicit shared_lock(mutex_type& m); // blocking
    shared_lock(mutex_type& m, defer_lock_t) noexcept;
    shared_lock(mutex_type& m, try_to_lock_t);
    shared_lock(mutex_type& m, adopt_lock_t);
    template <class Clock, class Duration>
        shared_lock(mutex_type& m,
                    const chrono::time_point<Clock, Duration>& abs_time);
    template <class Rep, class Period>
        shared_lock(mutex_type& m,
                    const chrono::duration<Rep, Period>& rel_time);
    ~shared_lock();

    shared_lock(shared_lock const&) = delete;
    shared_lock& operator=(shared_lock const&) = delete;

    shared_lock(shared_lock&& u) noexcept;
    shared_lock& operator=(shared_lock&& u) noexcept;

    void lock(); // blocking
    bool try_lock();
    template <class Rep, class Period>
        bool try_lock_for(const chrono::duration<Rep, Period>& rel_time);
    template <class Clock, class Duration>
        bool try_lock_until(const chrono::time_point<Clock, Duration>& abs_time);
    void unlock();

    // Setters
    void swap(shared_lock& u) noexcept;
    mutex_type* release() noexcept;

    // Getters
    bool owns_lock() const noexcept;
    explicit operator bool () const noexcept;
    mutex_type* mutex() const noexcept;
};

template <class Mutex>
    void swap(shared_lock<Mutex>& x, shared_lock<Mutex>& y) noexcept;

}  // std

*/

#include <__config>

#if !defined(_LIBCPP_HAS_NO_THREADS)

#  include <__chrono/duration.h>
#  include <__chrono/steady_clock.h>
#  include <__chrono/time_point.h>
#  include <__condition_variable/condition_variable.h>
#  include <__memory/addressof.h>
#  include <__mutex/mutex.h>
#  include <__mutex/tag_types.h>
#  include <__mutex/unique_lock.h>
#  include <__system_error/system_error.h>
#  include <__utility/swap.h>
#  include <cerrno>
#  include <version>

_LIBCPP_PUSH_MACROS
#  include <__undef_macros>

#  if _LIBCPP_STD_VER >= 14

#    if !defined(_LIBCPP_HAS_NO_PRAGMA_SYSTEM_HEADER)
#      pragma GCC system_header
#    endif

_LIBCPP_BEGIN_NAMESPACE_STD

#  endif // _LIBCPP_STD_VER >= 14

_LIBCPP_POP_MACROS

#endif // !defined(_LIBCPP_HAS_NO_THREADS)

#if !defined(_LIBCPP_REMOVE_TRANSITIVE_INCLUDES) && _LIBCPP_STD_VER <= 20
#  include <system_error>
#endif

#endif // _LIBCPP_SHARED_MUTEX