mirror of
https://github.com/matrix-construct/construct
synced 2024-11-09 03:21:15 +01:00
162 lines
3 KiB
C++
162 lines
3 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_DOCK_H
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namespace ircd::ctx
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{
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struct dock;
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}
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/// dock is a condition variable which has no requirement for locking because
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/// the context system does not require mutual exclusion for coherence.
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///
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class ircd::ctx::dock
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{
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using predicate = std::function<bool ()>;
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list q;
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void notify(ctx &) noexcept;
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public:
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bool empty() const;
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size_t size() const;
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template<class time_point> bool wait_until(time_point&&, const predicate &);
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template<class time_point> bool wait_until(time_point&&);
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template<class duration> bool wait_for(const duration &, const predicate &);
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template<class duration> bool wait_for(const duration &);
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void wait(const predicate &);
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void wait();
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void notify_all() noexcept;
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void notify_one() noexcept;
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void notify() noexcept;
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};
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/// Returns true if notified; false if timed out
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template<class duration>
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bool
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ircd::ctx::dock::wait_for(const duration &dur)
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{
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static const duration zero(0);
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assert(current);
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const unwind::exceptional renotify{[this]
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{
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notify_one();
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}};
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const unwind remove{[this]
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{
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q.remove(current);
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}};
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q.push_back(current);
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return ircd::ctx::wait<std::nothrow_t>(dur) > zero;
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}
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/// Returns true if predicate passed; false if timed out
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template<class duration>
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bool
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ircd::ctx::dock::wait_for(const duration &dur,
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const predicate &pred)
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{
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static const duration zero(0);
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if(pred())
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return true;
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assert(current);
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const unwind::exceptional renotify{[this]
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{
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notify_one();
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}};
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const unwind remove{[this]
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{
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q.remove(current);
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}};
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q.push_back(current); do
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{
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const bool expired
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{
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ircd::ctx::wait<std::nothrow_t>(dur) <= zero
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};
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if(pred())
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return true;
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if(expired)
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return false;
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}
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while(1);
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}
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/// Returns true if notified; false if timed out
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template<class time_point>
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bool
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ircd::ctx::dock::wait_until(time_point&& tp)
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{
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assert(current);
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const unwind::exceptional renotify{[this]
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{
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notify_one();
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}};
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const unwind remove{[this]
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{
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q.remove(current);
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}};
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q.push_back(current);
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return !ircd::ctx::wait_until<std::nothrow_t>(tp);
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}
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/// Returns true if predicate passed; false if timed out
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template<class time_point>
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bool
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ircd::ctx::dock::wait_until(time_point&& tp,
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const predicate &pred)
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{
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if(pred())
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return true;
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assert(current);
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const unwind::exceptional renotify{[this]
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{
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notify_one();
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}};
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const unwind remove{[this]
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{
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q.remove(current);
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}};
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q.push_back(current); do
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{
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const bool expired
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{
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ircd::ctx::wait_until<std::nothrow_t>(tp)
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};
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if(pred())
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return true;
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if(expired)
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return false;
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}
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while(1);
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}
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