mirror of
https://github.com/matrix-construct/construct
synced 2024-06-19 18:38:21 +02:00
101 lines
3 KiB
C++
101 lines
3 KiB
C++
// The Construct
|
|
//
|
|
// Copyright (C) The Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2020 Jason Volk <jason@zemos.net>
|
|
//
|
|
// Permission to use, copy, modify, and/or distribute this software for any
|
|
// purpose with or without fee is hereby granted, provided that the above
|
|
// copyright notice and this permission notice is present in all copies. The
|
|
// full license for this software is available in the LICENSE file.
|
|
|
|
#pragma once
|
|
#define HAVE_IRCD_CTX_WAIT_H
|
|
|
|
namespace ircd::ctx { inline namespace this_ctx
|
|
{
|
|
// Returns when context is woken up.
|
|
void wait();
|
|
|
|
// Return remaining time if notified; or <= 0 if not, and timeout thrown on throw overloads
|
|
microseconds wait(const microseconds &, const std::nothrow_t &);
|
|
|
|
template<class E,
|
|
class duration>
|
|
nothrow_overload<E, duration> wait(const duration &);
|
|
|
|
// timeout thrown if time point reached
|
|
template<class E = timeout,
|
|
class duration>
|
|
throw_overload<E, duration> wait(const duration &);
|
|
|
|
// Returns false if notified; true if time point reached
|
|
bool wait_until(const system_point &tp, const std::nothrow_t &);
|
|
|
|
// Returns false if notified; true if time point reached
|
|
template<class E>
|
|
nothrow_overload<E, bool> wait_until(const system_point &tp);
|
|
|
|
// timeout thrown if time point reached
|
|
template<class E = timeout>
|
|
throw_overload<E> wait_until(const system_point &tp);
|
|
}}
|
|
|
|
/// Wait for a notification until a point in time. If there is a notification
|
|
/// then context continues normally. If there's never a notification then an
|
|
/// exception (= timeout) is thrown.
|
|
/// interruption point.
|
|
template<class E>
|
|
inline ircd::throw_overload<E>
|
|
ircd::ctx::this_ctx::wait_until(const system_point &tp)
|
|
{
|
|
if(unlikely(wait_until<std::nothrow_t>(tp)))
|
|
throw E{};
|
|
}
|
|
|
|
/// Wait for a notification until a point in time. If there is a notification
|
|
/// then returns false. If there's never a notification then returns true.
|
|
/// interruption point. this is not noexcept.
|
|
template<class E>
|
|
inline ircd::nothrow_overload<E, bool>
|
|
ircd::ctx::this_ctx::wait_until(const system_point &tp)
|
|
{
|
|
return wait_until(tp, std::nothrow);
|
|
}
|
|
|
|
/// Wait for a notification for at most some amount of time. If the duration is
|
|
/// reached without a notification then E (= timeout) is thrown. Otherwise,
|
|
/// returns the time remaining on the duration.
|
|
/// interruption point
|
|
template<class E,
|
|
class duration>
|
|
inline ircd::throw_overload<E, duration>
|
|
ircd::ctx::this_ctx::wait(const duration &d)
|
|
{
|
|
const auto ret
|
|
{
|
|
wait<std::nothrow_t>(d)
|
|
};
|
|
|
|
if(unlikely(ret <= duration(0)))
|
|
throw E{};
|
|
|
|
return ret;
|
|
}
|
|
|
|
/// Wait for a notification for some amount of time. This function returns
|
|
/// when a context is notified. It always returns the duration remaining which
|
|
/// will be <= 0 to indicate a timeout without notification.
|
|
/// interruption point. this is not noexcept.
|
|
template<class E,
|
|
class duration>
|
|
inline ircd::nothrow_overload<E, duration>
|
|
ircd::ctx::this_ctx::wait(const duration &d)
|
|
{
|
|
const auto ret
|
|
{
|
|
wait(duration_cast<microseconds>(d), std::nothrow)
|
|
};
|
|
|
|
return duration_cast<duration>(ret);
|
|
}
|