mirror of
https://github.com/matrix-construct/construct
synced 2024-06-19 18:38:21 +02:00
159 lines
3.6 KiB
C++
159 lines
3.6 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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void terminate(dock &) noexcept;
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void interrupt(dock &) noexcept;
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void notify(dock &) noexcept;
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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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struct ircd::ctx::dock
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{
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enum opts :uint;
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struct continuation;
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using predicate = std::function<bool ()>;
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private:
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list q;
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public:
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bool empty() const noexcept;
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size_t size() const noexcept;
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bool waiting(const ctx &) const noexcept;
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bool wait_until(const system_point, const predicate &, const opts = (opts)0);
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bool wait_until(const system_point, const opts = (opts)0);
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template<class duration> bool wait_for(const duration, const predicate &, const opts = (opts)0);
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template<class duration> bool wait_for(const duration, const opts = (opts)0);
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void wait(const predicate &, const opts = (opts)0);
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void wait(const opts = (opts)0);
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void terminate_all() noexcept;
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void interrupt_all() noexcept;
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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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namespace ircd::ctx
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{
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template<> bool dock::wait_for(const microseconds, const predicate &, const opts);
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template<> bool dock::wait_for(const microseconds, const opts);
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}
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struct [[gnu::visibility("internal")]]
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ircd::ctx::dock::continuation
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{
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dock *const d;
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const opts *const o;
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continuation(dock *, const opts &opts);
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~continuation() noexcept;
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};
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/// Options. These are bitflags for forward compatibility with unrelated opts
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/// even though some flags are exclusive to others.
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enum ircd::ctx::dock::opts
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:uint
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{
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/// No options.
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NONE = 0x00,
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/// Waiting context will add itself to back of queue. This is the default.
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FIFO = 0x01,
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/// Waiting context will add itself to front of queue. The default is FIFO
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/// for fair queuing preventing starvation.
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LIFO = 0x02,
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/// Waiting context will add itself to front if its ID is lower than the
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/// front, otherwise back.
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SORT = 0x04,
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};
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/// Wake up the next context waiting on the dock
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inline void
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ircd::ctx::dock::notify_one()
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noexcept
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{
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if(q.empty())
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return;
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ircd::ctx::notify(*q.front());
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}
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template<class duration>
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inline bool
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ircd::ctx::dock::wait_for(const duration dur,
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const predicate &pred,
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const opts opts)
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{
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static_assert(!std::is_same<duration, microseconds>());
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return wait_for(duration_cast<microseconds>(dur), pred, opts);
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}
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template<class duration>
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inline bool
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ircd::ctx::dock::wait_for(const duration dur,
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const opts opts)
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{
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static_assert(!std::is_same<duration, microseconds>());
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return wait_for(duration_cast<microseconds>(dur), opts);
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}
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/// The number of contexts waiting in the queue.
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inline size_t
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ircd::ctx::dock::size()
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const noexcept
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{
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return q.size();
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}
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/// The number of contexts waiting in the queue.
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inline bool
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ircd::ctx::dock::empty()
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const noexcept
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{
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return q.empty();
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}
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inline void
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ircd::ctx::notify(dock &dock)
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noexcept
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{
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dock.notify();
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}
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inline void
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ircd::ctx::interrupt(dock &dock)
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noexcept
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{
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dock.interrupt_all();
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}
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inline void
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ircd::ctx::terminate(dock &dock)
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noexcept
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{
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dock.terminate_all();
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}
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