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authorMatthias P. Braendli <matthias.braendli@mpb.li>2019-10-07 04:52:50 +0200
committerMatthias P. Braendli <matthias.braendli@mpb.li>2019-10-07 04:52:50 +0200
commit0aa6201a490bfabc0ae021ceb9f1fb0f46727c5d (patch)
treea71d934d8151dd43e7c16555fef17fd749c5da70 /lib/asio/detail/scheduler.hpp
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-//
-// detail/scheduler.hpp
-// ~~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
-//
-// Distributed under the Boost Software License, Version 1.0. (See accompanying
-// file LICENSE_1_0.txt or copy at http://www.boost.org/LICENSE_1_0.txt)
-//
-
-#ifndef ASIO_DETAIL_SCHEDULER_HPP
-#define ASIO_DETAIL_SCHEDULER_HPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-
-#include "asio/error_code.hpp"
-#include "asio/execution_context.hpp"
-#include "asio/detail/atomic_count.hpp"
-#include "asio/detail/conditionally_enabled_event.hpp"
-#include "asio/detail/conditionally_enabled_mutex.hpp"
-#include "asio/detail/op_queue.hpp"
-#include "asio/detail/reactor_fwd.hpp"
-#include "asio/detail/scheduler_operation.hpp"
-#include "asio/detail/thread_context.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace detail {
-
-struct scheduler_thread_info;
-
-class scheduler
- : public execution_context_service_base<scheduler>,
- public thread_context
-{
-public:
- typedef scheduler_operation operation;
-
- // Constructor. Specifies the number of concurrent threads that are likely to
- // run the scheduler. If set to 1 certain optimisation are performed.
- ASIO_DECL scheduler(asio::execution_context& ctx,
- int concurrency_hint = 0);
-
- // Destroy all user-defined handler objects owned by the service.
- ASIO_DECL void shutdown();
-
- // Initialise the task, if required.
- ASIO_DECL void init_task();
-
- // Run the event loop until interrupted or no more work.
- ASIO_DECL std::size_t run(asio::error_code& ec);
-
- // Run until interrupted or one operation is performed.
- ASIO_DECL std::size_t run_one(asio::error_code& ec);
-
- // Run until timeout, interrupted, or one operation is performed.
- ASIO_DECL std::size_t wait_one(
- long usec, asio::error_code& ec);
-
- // Poll for operations without blocking.
- ASIO_DECL std::size_t poll(asio::error_code& ec);
-
- // Poll for one operation without blocking.
- ASIO_DECL std::size_t poll_one(asio::error_code& ec);
-
- // Interrupt the event processing loop.
- ASIO_DECL void stop();
-
- // Determine whether the scheduler is stopped.
- ASIO_DECL bool stopped() const;
-
- // Restart in preparation for a subsequent run invocation.
- ASIO_DECL void restart();
-
- // Notify that some work has started.
- void work_started()
- {
- ++outstanding_work_;
- }
-
- // Used to compensate for a forthcoming work_finished call. Must be called
- // from within a scheduler-owned thread.
- ASIO_DECL void compensating_work_started();
-
- // Notify that some work has finished.
- void work_finished()
- {
- if (--outstanding_work_ == 0)
- stop();
- }
-
- // Return whether a handler can be dispatched immediately.
- bool can_dispatch()
- {
- return thread_call_stack::contains(this) != 0;
- }
-
- // Request invocation of the given operation and return immediately. Assumes
- // that work_started() has not yet been called for the operation.
- ASIO_DECL void post_immediate_completion(
- operation* op, bool is_continuation);
-
- // Request invocation of the given operation and return immediately. Assumes
- // that work_started() was previously called for the operation.
- ASIO_DECL void post_deferred_completion(operation* op);
-
- // Request invocation of the given operations and return immediately. Assumes
- // that work_started() was previously called for each operation.
- ASIO_DECL void post_deferred_completions(op_queue<operation>& ops);
-
- // Enqueue the given operation following a failed attempt to dispatch the
- // operation for immediate invocation.
- ASIO_DECL void do_dispatch(operation* op);
-
- // Process unfinished operations as part of a shutdownoperation. Assumes that
- // work_started() was previously called for the operations.
- ASIO_DECL void abandon_operations(op_queue<operation>& ops);
-
- // Get the concurrency hint that was used to initialise the scheduler.
- int concurrency_hint() const
- {
- return concurrency_hint_;
- }
-
-private:
- // The mutex type used by this scheduler.
- typedef conditionally_enabled_mutex mutex;
-
- // The event type used by this scheduler.
- typedef conditionally_enabled_event event;
-
- // Structure containing thread-specific data.
- typedef scheduler_thread_info thread_info;
-
- // Run at most one operation. May block.
- ASIO_DECL std::size_t do_run_one(mutex::scoped_lock& lock,
- thread_info& this_thread, const asio::error_code& ec);
-
- // Run at most one operation with a timeout. May block.
- ASIO_DECL std::size_t do_wait_one(mutex::scoped_lock& lock,
- thread_info& this_thread, long usec, const asio::error_code& ec);
-
- // Poll for at most one operation.
- ASIO_DECL std::size_t do_poll_one(mutex::scoped_lock& lock,
- thread_info& this_thread, const asio::error_code& ec);
-
- // Stop the task and all idle threads.
- ASIO_DECL void stop_all_threads(mutex::scoped_lock& lock);
-
- // Wake a single idle thread, or the task, and always unlock the mutex.
- ASIO_DECL void wake_one_thread_and_unlock(
- mutex::scoped_lock& lock);
-
- // Helper class to perform task-related operations on block exit.
- struct task_cleanup;
- friend struct task_cleanup;
-
- // Helper class to call work-related operations on block exit.
- struct work_cleanup;
- friend struct work_cleanup;
-
- // Whether to optimise for single-threaded use cases.
- const bool one_thread_;
-
- // Mutex to protect access to internal data.
- mutable mutex mutex_;
-
- // Event to wake up blocked threads.
- event wakeup_event_;
-
- // The task to be run by this service.
- reactor* task_;
-
- // Operation object to represent the position of the task in the queue.
- struct task_operation : operation
- {
- task_operation() : operation(0) {}
- } task_operation_;
-
- // Whether the task has been interrupted.
- bool task_interrupted_;
-
- // The count of unfinished work.
- atomic_count outstanding_work_;
-
- // The queue of handlers that are ready to be delivered.
- op_queue<operation> op_queue_;
-
- // Flag to indicate that the dispatcher has been stopped.
- bool stopped_;
-
- // Flag to indicate that the dispatcher has been shut down.
- bool shutdown_;
-
- // The concurrency hint used to initialise the scheduler.
- const int concurrency_hint_;
-};
-
-} // namespace detail
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#if defined(ASIO_HEADER_ONLY)
-# include "asio/detail/impl/scheduler.ipp"
-#endif // defined(ASIO_HEADER_ONLY)
-
-#endif // ASIO_DETAIL_SCHEDULER_HPP