mirror of
https://github.com/matrix-construct/construct
synced 2024-08-29 21:05:16 +02:00
367 lines
6.5 KiB
C++
367 lines
6.5 KiB
C++
// Matrix Construct
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//
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// Copyright (C) Matrix Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2018 Jason Volk <jason@zemos.net>
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//
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// Permission to use, copy, modify, and/or distribute this software for any
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// purpose with or without fee is hereby granted, provided that the above
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// copyright notice and this permission notice is present in all copies. The
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// full license for this software is available in the LICENSE file.
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#pragma once
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#define HAVE_IRCD_CTX_SHARED_MUTEX_H
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namespace ircd::ctx
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{
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class shared_mutex;
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}
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class ircd::ctx::shared_mutex
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{
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bool u;
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ssize_t s;
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list q;
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void release();
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public:
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size_t waiting() const;
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bool try_lock();
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bool try_lock_shared();
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bool try_lock_upgrade();
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template<class time_point> bool try_lock_until(time_point&&);
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template<class time_point> bool try_lock_shared_until(time_point&&);
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template<class time_point> bool try_lock_upgrade_until(time_point&&);
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template<class duration> bool try_lock_for(duration&&);
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template<class duration> bool try_lock_shared_for(duration&&);
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template<class duration> bool try_lock_upgrade_for(duration&&);
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void lock();
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void lock_shared();
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void lock_upgrade();
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bool try_unlock_shared_and_lock();
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bool try_unlock_shared_and_lock_upgrade();
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bool try_unlock_upgrade_and_lock();
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template<class time_point> bool try_unlock_shared_and_lock_until(time_point&&);
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template<class time_point> bool try_unlock_shared_and_lock_upgrade_until(time_point&&);
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template<class time_point> bool try_unlock_upgrade_and_lock_until(time_point&&);
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template<class duration> bool try_unlock_shared_and_lock_for(duration&&);
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template<class duration> bool try_unlock_shared_and_lock_upgrade_for(duration&&);
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template<class duration> bool try_unlock_upgrade_and_lock_for(duration&&);
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void unlock();
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void unlock_shared();
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void unlock_upgrade();
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void unlock_and_lock_shared();
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void unlock_and_lock_upgrade();
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void unlock_upgrade_and_lock();
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void unlock_upgrade_and_lock_shared();
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shared_mutex();
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shared_mutex(shared_mutex &&) noexcept;
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shared_mutex(const shared_mutex &) = delete;
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shared_mutex &operator=(shared_mutex &&) noexcept;
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shared_mutex &operator=(const shared_mutex &) = delete;
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~shared_mutex() noexcept;
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};
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inline
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ircd::ctx::shared_mutex::shared_mutex()
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:u{false}
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,s{0}
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{
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}
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inline
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ircd::ctx::shared_mutex::shared_mutex(shared_mutex &&o)
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noexcept
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:u{std::move(o.u)}
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,s{std::move(o.s)}
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{
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o.u = false;
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o.s = 0;
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}
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inline
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ircd::ctx::shared_mutex &
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ircd::ctx::shared_mutex::operator=(shared_mutex &&o)
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noexcept
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{
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this->~shared_mutex();
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std::swap(u, o.u);
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std::swap(s, o.s);
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return *this;
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}
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inline
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ircd::ctx::shared_mutex::~shared_mutex()
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noexcept
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{
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assert(!u);
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assert(s == 0);
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assert(q.empty());
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}
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inline void
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ircd::ctx::shared_mutex::unlock_upgrade_and_lock_shared()
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{
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++s;
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u = false;
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release();
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}
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inline void
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ircd::ctx::shared_mutex::unlock_upgrade_and_lock()
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{
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s = std::numeric_limits<decltype(s)>::min();
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u = false;
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}
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inline void
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ircd::ctx::shared_mutex::unlock_and_lock_upgrade()
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{
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s = 0;
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u = true;
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}
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inline void
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ircd::ctx::shared_mutex::unlock_and_lock_shared()
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{
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s = 1;
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release();
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}
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inline void
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ircd::ctx::shared_mutex::unlock_upgrade()
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{
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u = false;
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release();
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}
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inline void
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ircd::ctx::shared_mutex::unlock_shared()
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{
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--s;
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release();
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}
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inline void
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ircd::ctx::shared_mutex::unlock()
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{
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s = 0;
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release();
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}
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template<class duration>
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bool
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ircd::ctx::shared_mutex::try_unlock_upgrade_and_lock_for(duration&& d)
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{
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return try_unlock_upgrade_and_lock_until(steady_clock::now() + d);
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}
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template<class duration>
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bool
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ircd::ctx::shared_mutex::try_unlock_shared_and_lock_upgrade_for(duration&& d)
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{
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return try_unlock_shared_and_lock_upgrade_until(steady_clock::now() + d);
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}
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template<class duration>
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bool
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ircd::ctx::shared_mutex::try_unlock_shared_and_lock_for(duration&& d)
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{
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return try_unlock_shared_and_lock_until(steady_clock::now() + d);
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}
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template<class time_point>
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bool
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ircd::ctx::shared_mutex::try_unlock_upgrade_and_lock_until(time_point&& tp)
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{
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assert(0);
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return false;
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}
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template<class time_point>
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bool
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ircd::ctx::shared_mutex::try_unlock_shared_and_lock_upgrade_until(time_point&& tp)
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{
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assert(0);
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return false;
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}
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template<class time_point>
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bool
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ircd::ctx::shared_mutex::try_unlock_shared_and_lock_until(time_point&& tp)
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{
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assert(0);
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return false;
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}
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inline bool
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ircd::ctx::shared_mutex::try_unlock_upgrade_and_lock()
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{
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if(!try_lock())
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return false;
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u = false;
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return true;
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}
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inline bool
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ircd::ctx::shared_mutex::try_unlock_shared_and_lock_upgrade()
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{
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if(!try_lock_upgrade())
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return false;
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--s;
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return true;
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}
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inline bool
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ircd::ctx::shared_mutex::try_unlock_shared_and_lock()
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{
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if(s != 1)
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return false;
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s = 1;
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return true;
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}
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inline void
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ircd::ctx::shared_mutex::lock_upgrade()
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{
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if(likely(try_lock_upgrade()))
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return;
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q.push_back(current);
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while(!try_lock_upgrade())
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wait();
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}
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inline void
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ircd::ctx::shared_mutex::lock_shared()
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{
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if(likely(try_lock_shared()))
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return;
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q.push_back(current);
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while(!try_lock_shared())
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wait();
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}
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inline void
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ircd::ctx::shared_mutex::lock()
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{
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if(likely(try_lock()))
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return;
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q.push_back(current);
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while(!try_lock())
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wait();
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}
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template<class duration>
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bool
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ircd::ctx::shared_mutex::try_lock_upgrade_for(duration&& d)
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{
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return try_lock_upgrade_until(steady_clock::now() + d);
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}
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template<class duration>
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bool
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ircd::ctx::shared_mutex::try_lock_shared_for(duration&& d)
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{
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return try_lock_shared_until(steady_clock::now() + d);
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}
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template<class duration>
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bool
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ircd::ctx::shared_mutex::try_lock_for(duration&& d)
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{
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return try_lock_until(steady_clock::now() + d);
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}
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template<class time_point>
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bool
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ircd::ctx::shared_mutex::try_lock_upgrade_until(time_point&& d)
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{
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assert(0);
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return false;
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}
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template<class time_point>
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bool
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ircd::ctx::shared_mutex::try_lock_shared_until(time_point&& d)
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{
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assert(0);
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return false;
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}
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template<class time_point>
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bool
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ircd::ctx::shared_mutex::try_lock_until(time_point&& tp)
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{
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if(likely(try_lock()))
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return true;
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q.push_back(current);
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while(!try_lock())
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{
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if(unlikely(wait_until<std::nothrow_t>(tp)))
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{
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q.remove(current);
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return false;
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}
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}
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return true;
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}
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inline bool
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ircd::ctx::shared_mutex::try_lock_upgrade()
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{
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if(s < 0)
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return false;
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if(u)
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return false;
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u = true;
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return true;
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}
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inline bool
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ircd::ctx::shared_mutex::try_lock_shared()
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{
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++s;
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return s >= 0;
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}
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inline bool
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ircd::ctx::shared_mutex::try_lock()
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{
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if(s)
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return false;
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s = std::numeric_limits<decltype(s)>::min();
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return true;
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}
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inline size_t
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ircd::ctx::shared_mutex::waiting()
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const
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{
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return q.size();
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}
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inline void
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ircd::ctx::shared_mutex::release()
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{
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release_sequence(q);
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}
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