mirror of
https://github.com/matrix-construct/construct
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30796e5729
ircd::json::tuple: Fix template name related for clang-11. ircd::ctx: Fix template related for clang-11; inline linkages. ircd:Ⓜ️🪝 Fix template related for clang-11.
207 lines
6.7 KiB
C++
207 lines
6.7 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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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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bool is_main_thread() noexcept;
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void assert_main_thread();
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const uint64_t &id(const ctx &) noexcept; // Unique ID for context
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string_view name(const ctx &) noexcept; // User's optional label for context
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const uint32_t &flags(const ctx &) noexcept; // Direct flags access
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const int32_t ¬es(const ctx &) noexcept; // Peeks at internal semaphore count
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const uint64_t &epoch(const ctx &) noexcept; // Context switching counter
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const ulong &cycles(const ctx &) noexcept; // Accumulated tsc (not counting cur slice)
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const int8_t &ionice(const ctx &) noexcept; // IO priority nice-value
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const int8_t &nice(const ctx &) noexcept; // Scheduling priority nice-value
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bool interruptible(const ctx &) noexcept; // Context can throw at interruption point
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bool interruption(const ctx &) noexcept; // Context was marked for interruption
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bool termination(const ctx &) noexcept; // Context was marked for termination
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bool finished(const ctx &) noexcept; // Context function returned (or exception).
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bool started(const ctx &) noexcept; // Context was ever entered.
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bool running(const ctx &) noexcept; // Context is the currently running ctx.
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bool waiting(const ctx &) noexcept; // started() && !finished() && !running()
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bool queued(const ctx &) noexcept; // !running() && notes() > 0
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uint32_t &flags(ctx &) noexcept; // Direct flags access
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int8_t ionice(ctx &, const int8_t &) noexcept; // IO priority nice-value
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int8_t nice(ctx &, const int8_t &) noexcept; // Scheduling priority nice-value
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void interruptible(ctx &, const bool &) noexcept; // 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 &) noexcept; // Queue a context switch to arg
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void yield(ctx &); // Direct context switch to arg
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bool for_each(const std::function<bool (ctx &)> &);
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const uint64_t &epoch() noexcept;
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extern log::log log;
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}
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#include "prof.h"
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#include "this_ctx.h"
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#include "context.h"
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#include "wait.h"
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#include "sleep.h"
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#include "stack.h"
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#include "stack_usage_assertion.h"
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#include "slice_usage_warning.h"
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#include "critical_assertion.h"
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#include "critical_indicator.h"
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#include "exception_handler.h"
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#include "uninterruptible.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 "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 "scope_notify.h"
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#include "mutex.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 "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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#include "concurrent.h"
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#include "concurrent_for_each.h"
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#include "trit.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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namespace this_ctx = ctx::this_ctx;
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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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using ctx::is_main_thread;
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using ctx::assert_main_thread;
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}
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/// Marks `ctx` for whether to allow or suppress interruption. Suppression
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/// does not ignore an interrupt itself, it only ignores the interruption
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/// points. Thus when a suppression ends if the interrupt flag was ever set
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/// the next interruption point will throw as expected.
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inline void
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ircd::ctx::interruptible(ctx &ctx,
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const bool &b)
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noexcept
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{
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flags(ctx) ^= (flags(ctx) ^ (ulong(b) - 1)) & context::NOINTERRUPT;
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assert(bool(flags(ctx) & context::NOINTERRUPT) == !b);
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assert(interruptible(ctx) == b);
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}
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/// Indicates if `ctx` was terminated; does not clear the flag
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inline bool
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ircd::ctx::termination(const ctx &c)
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noexcept
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{
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return flags(c) & context::TERMINATED;
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}
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/// Indicates if `ctx` was interrupted; does not clear the flag
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inline bool
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ircd::ctx::interruption(const ctx &c)
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noexcept
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{
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return flags(c) & context::INTERRUPTED;
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}
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inline bool
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ircd::ctx::interruptible(const ctx &ctx)
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noexcept
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{
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return ~flags(ctx) & context::NOINTERRUPT;
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}
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/// Returns the cycle count for `ctx`
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inline const ulong &
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ircd::ctx::cycles(const ctx &ctx)
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noexcept
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{
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return prof::get(ctx, prof::event::CYCLES);
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}
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/// Returns the yield count for `ctx`
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inline const uint64_t &
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ircd::ctx::epoch(const ctx &ctx)
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noexcept
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{
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return prof::get(ctx, prof::event::YIELD);
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}
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inline void
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__attribute__((always_inline))
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ircd::ctx::assert_main_thread()
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{
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assert(is_main_thread());
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}
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inline bool
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__attribute__((always_inline))
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ircd::ctx::is_main_thread()
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noexcept
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{
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return current ||
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std::this_thread::get_id() == ios::main_thread_id;
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}
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