mirror of
https://github.com/matrix-construct/construct
synced 2024-11-09 11:31:11 +01:00
99 lines
3 KiB
C++
99 lines
3 KiB
C++
// The Construct
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//
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// Copyright (C) The Construct Developers, Authors & Contributors
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// Copyright (C) 2016-2020 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_WAIT_H
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namespace ircd::ctx { inline namespace this_ctx
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{
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// Returns when context is woken up.
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void wait();
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// Return remaining time if notified; or <= 0 if not, and timeout thrown on throw overloads
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microseconds wait(const microseconds &, const std::nothrow_t &);
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template<class E,
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class duration>
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nothrow_overload<E, duration> wait(const duration &);
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// timeout thrown if time point reached
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template<class E = timeout,
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class duration>
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throw_overload<E, duration> wait(const duration &);
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// Returns false if notified; true if time point reached
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bool wait_until(const system_point &tp, const std::nothrow_t &);
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// Returns false if notified; true if time point reached
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template<class E>
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nothrow_overload<E, bool> wait_until(const system_point &tp);
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// timeout thrown if time point reached
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template<class E = timeout>
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throw_overload<E> wait_until(const system_point &tp);
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}}
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/// Wait for a notification until a point in time. If there is a notification
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/// then context continues normally. If there's never a notification then an
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/// exception (= timeout) is thrown.
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/// interruption point.
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template<class E>
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ircd::throw_overload<E>
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ircd::ctx::this_ctx::wait_until(const system_point &tp)
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{
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if(wait_until<std::nothrow_t>(tp))
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throw E{};
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}
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/// Wait for a notification until a point in time. If there is a notification
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/// then returns true. If there's never a notification then returns false.
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/// interruption point. this is not noexcept.
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template<class E>
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ircd::nothrow_overload<E, bool>
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ircd::ctx::this_ctx::wait_until(const system_point &tp)
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{
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return wait_until(tp, std::nothrow);
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}
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/// Wait for a notification for at most some amount of time. If the duration is
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/// reached without a notification then E (= timeout) is thrown. Otherwise,
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/// returns the time remaining on the duration.
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/// interruption point
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template<class E,
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class duration>
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ircd::throw_overload<E, duration>
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ircd::ctx::this_ctx::wait(const duration &d)
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{
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const auto ret
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{
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wait<std::nothrow_t>(d)
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};
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return ret <= duration(0)?
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throw E{}:
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ret;
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}
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/// Wait for a notification for some amount of time. This function returns
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/// when a context is notified. It always returns the duration remaining which
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/// will be <= 0 to indicate a timeout without notification.
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/// interruption point. this is not noexcept.
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template<class E,
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class duration>
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ircd::nothrow_overload<E, duration>
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ircd::ctx::this_ctx::wait(const duration &d)
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{
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const auto ret
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{
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wait(duration_cast<microseconds>(d), std::nothrow)
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};
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return duration_cast<duration>(ret);
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}
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