mirror of
https://github.com/matrix-construct/construct
synced 2024-11-16 15:00:51 +01:00
89 lines
3.2 KiB
C++
89 lines
3.2 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.
|
|
|
|
#define HAVE_IRCD_RUN_H
|
|
|
|
// Forward declarations for because ctx.h is included after runlevel.h.
|
|
namespace ircd::ctx
|
|
{
|
|
struct dock;
|
|
}
|
|
|
|
namespace ircd::run
|
|
{
|
|
enum class level :int;
|
|
struct changed;
|
|
|
|
string_view reflect(const enum level &);
|
|
bool set(const enum level &);
|
|
|
|
extern const enum level &level;
|
|
}
|
|
|
|
/// An instance of this class registers itself to be called back when
|
|
/// the ircd::run::level has changed.
|
|
///
|
|
/// Note: Its destructor will access a list in libircd; after a callback
|
|
/// for a HALT do not unload libircd.so until destructing this object.
|
|
///
|
|
/// A static ctx::dock is also available for contexts to wait for a run::level
|
|
/// change notification.
|
|
///
|
|
struct ircd::run::changed
|
|
:instance_list<ircd::run::changed>
|
|
,std::function<void (const enum level &)>
|
|
{
|
|
using handler = std::function<void (const enum level &)>;
|
|
|
|
// Users on an ircd::ctx who wish to use the dock interface to wait for
|
|
// a run::level change can directly access this static instance.
|
|
static ctx::dock dock;
|
|
|
|
/// The handler function will be called back for any run::level change while
|
|
/// this instance remains in scope.
|
|
changed(handler function);
|
|
~changed() noexcept;
|
|
};
|
|
|
|
/// The run::level allows all observers to know the coarse state of IRCd and to
|
|
/// react accordingly. This can be used by the embedder of libircd to know
|
|
/// when it's safe to use or delete libircd resources. It is also used
|
|
/// similarly by the library and its modules. Only one runlevel is active at
|
|
/// any time.
|
|
///
|
|
/// * HALT is the off mode. Nothing is/will be running in libircd until
|
|
/// an invocation of ircd::init();
|
|
///
|
|
/// * READY is the state after calling ircd::init(). Leaving READY is done with
|
|
/// the user either calling their ios.run() to start executing tasks or calling
|
|
/// ircd::quit() to HALT again.
|
|
///
|
|
/// * START indicates the daemon is executing its startup procedures. Leaving
|
|
/// the START state occurs internally when there is success or a fatal error.
|
|
///
|
|
/// * RUN is the service mode. Full client and application functionality exists
|
|
/// in this mode. Leaving the RUN mode is done with ircd::quit();
|
|
///
|
|
/// * QUIT indicates the daemon is executing the shutdown procedures. This
|
|
/// will eventually return back to the HALT state.
|
|
///
|
|
/// * FAULT is a special mode indicating something really bad. The exact
|
|
/// details of this mode are ambiguous. Users do not have to handle this.
|
|
///
|
|
enum class ircd::run::level
|
|
:int
|
|
{
|
|
HALT = 0, ///< x <-- IRCd Powered off.
|
|
READY = 1, ///< | | Ready for user to run ios event loop.
|
|
START = 2, ///< | | Starting up subsystems for service.
|
|
RUN = 3, ///< O | IRCd in service.
|
|
QUIT = 4, ///< --> ^ Clean shutdown in progress.
|
|
FAULT = -1, ///< Unrecoverable fault.
|
|
};
|