mirror of
https://github.com/matrix-construct/construct
synced 2024-11-30 02:32:43 +01:00
74 lines
2.6 KiB
C++
74 lines
2.6 KiB
C++
// Matrix Construct
|
|
//
|
|
// Copyright (C) Matrix Construct Developers, Authors & Contributors
|
|
// Copyright (C) 2016-2018 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_CONTINUATION_H
|
|
|
|
// This file is not included with the IRCd standard include stack because
|
|
// it requires symbols we can't forward declare without boost headers. It
|
|
// is part of the <ircd/asio.h> stack which can be included in your
|
|
// definition file if necessary.
|
|
|
|
namespace ircd::ctx
|
|
{
|
|
struct continuation;
|
|
|
|
using yield_context = boost::asio::yield_context;
|
|
using yield_closure = std::function<void (yield_context &)>;
|
|
using interruptor = std::function<void (ctx *const &)>;
|
|
using predicate = std::function<bool ()>;
|
|
}
|
|
|
|
namespace ircd
|
|
{
|
|
using ctx::continuation;
|
|
}
|
|
|
|
/// This object must be placed on the stack when the context is yielding (INTERNAL)
|
|
///
|
|
/// The instance contains references to some callables which must remain valid.
|
|
///
|
|
/// - predicate (NOT YET USED)
|
|
/// A wakeup condition. This should be a simple boolean function which
|
|
/// tests whether the context should be woken up. The continuation references
|
|
/// this to convey the condition to a scheduler which may test many predicates
|
|
/// while contexts are asleep and then determine a schedule. This is an
|
|
/// alternative to waking up contexts first to test their predicates.
|
|
///
|
|
/// - interruptor
|
|
/// An interruption action. This is called when a context cannot wakeup on its
|
|
/// own after receiving an interruption without help from this action. Common
|
|
/// use for this is with yields to asio.
|
|
///
|
|
struct ircd::ctx::continuation
|
|
{
|
|
static const predicate asio_predicate;
|
|
static const predicate true_predicate;
|
|
static const predicate false_predicate;
|
|
static const interruptor noop_interruptor;
|
|
|
|
ctx *const self;
|
|
const predicate *const pred;
|
|
const interruptor *const intr;
|
|
const uint uncaught_exceptions;
|
|
|
|
operator const boost::asio::yield_context &() const noexcept;
|
|
operator boost::asio::yield_context &() noexcept;
|
|
|
|
continuation(const predicate &,
|
|
const interruptor &,
|
|
const yield_closure &);
|
|
|
|
continuation(continuation &&) = delete;
|
|
continuation(const continuation &) = delete;
|
|
continuation &operator=(continuation &&) = delete;
|
|
continuation &operator=(const continuation &) = delete;
|
|
~continuation() noexcept;
|
|
};
|