mirror of
https://github.com/matrix-construct/construct
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113 lines
4.3 KiB
C++
113 lines
4.3 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_H
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/// Userspace Contexts: cooperative threading from stackful coroutines.
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///
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/// This is the public interface to the userspace context system. No 3rd party
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/// symbols are included from here. This file is included automatically in stdinc.h
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/// and you do not have to include it manually.
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///
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/// There are two primary objects at work in the context system:
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///
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/// `struct context` <ircd/ctx/context.h>
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/// Public interface emulating std::thread; included automatically from here.
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/// To spawn and manipulate contexts, deal with this object.
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///
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/// `struct ctx` (ircd/ctx.cc)
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/// Internal implementation of the context. This is not included here.
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/// Several low-level functions are exposed for library creators. This file is usually
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/// included when boost/asio.hpp is also included and calls are actually made into boost.
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///
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/// boost::asio is not included from here. To access that include boost in a
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/// definition file with #include <ircd/asio.h>. That include contains some
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/// devices we use to yield a context to asio.
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///
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namespace ircd::ctx
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{
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using std::chrono::steady_clock;
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using time_point = steady_clock::time_point;
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struct ctx;
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IRCD_EXCEPTION(ircd::error, error)
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IRCD_EXCEPTION(error, interrupted)
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IRCD_EXCEPTION(error, timeout)
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struct terminated {}; // Special exception
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IRCD_OVERLOAD(threadsafe)
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extern const std::list<ctx *> &ctxs; // List of all ctx instances
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const uint64_t &id(const ctx &); // Unique ID for context
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string_view name(const ctx &); // User's optional label for context
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const size_t &stack_max(const ctx &); // Returns stack size allocated for ctx
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const size_t &stack_at(const ctx &); // Stack at last sleep (also see this_ctx.h)
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const int64_t ¬es(const ctx &); // Peeks at internal semaphore count
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const uint64_t &yields(const ctx &); // Context switching counter
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const ulong &cycles(const ctx &); // Accumulated tsc (not counting cur slice)
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bool interruptible(const ctx &); // Context can throw at interruption point
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bool interruption(const ctx &); // Context was marked for interruption
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bool termination(const ctx &); // Context was marked for termination
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bool finished(const ctx &); // Context function returned (or exception).
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bool started(const ctx &); // Context was ever entered.
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bool running(const ctx &); // Context is the currently running ctx.
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bool waiting(const ctx &); // started() && !finished() && !running()
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void interruptible(ctx &, const bool &); // False for interrupt suppression.
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void interrupt(ctx &); // Interrupt the context.
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void terminate(ctx &); // Interrupt for termination.
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void signal(ctx &, std::function<void ()>); // Post function to context strand
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void notify(ctx &, threadsafe_t); // Notify context with threadsafety.
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bool notify(ctx &); // Queue a context switch to arg
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void yield(ctx &); // Direct context switch to arg
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}
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#include "this_ctx.h"
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#include "prof.h"
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#include "list.h"
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#include "dock.h"
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#include "latch.h"
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#include "queue.h"
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#include "mutex.h"
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#include "shared_mutex.h"
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#include "upgrade_lock.h"
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#include "unlock_guard.h"
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#include "condition_variable.h"
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#include "view.h"
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#include "shared_state.h"
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#include "promise.h"
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#include "future.h"
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#include "when.h"
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#include "context.h"
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#include "async.h"
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#include "pool.h"
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#include "ole.h"
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#include "fault.h"
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// Exports to ircd::
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namespace ircd
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{
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//using yield = boost::asio::yield_context;
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using ctx::timeout;
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using ctx::context;
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using ctx::sleep;
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using ctx::promise;
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using ctx::future;
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using ctx::use_future_t;
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using ctx::use_future;
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using ctx::critical_assertion;
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using ctx::critical_indicator;
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}
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