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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/impl/select_reactor.ipp
parent558d74bffd9f069955af52c0b308a1d6169bcff0 (diff)
parent0330221d51421caa110b8c5dcb567cc3d0620eb9 (diff)
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Merge lime output into next branch
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-//
-// detail/impl/select_reactor.ipp
-// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-//
-// 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_IMPL_SELECT_REACTOR_IPP
-#define ASIO_DETAIL_IMPL_SELECT_REACTOR_IPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-
-#if defined(ASIO_HAS_IOCP) \
- || (!defined(ASIO_HAS_DEV_POLL) \
- && !defined(ASIO_HAS_EPOLL) \
- && !defined(ASIO_HAS_KQUEUE) \
- && !defined(ASIO_WINDOWS_RUNTIME))
-
-#include "asio/detail/fd_set_adapter.hpp"
-#include "asio/detail/select_reactor.hpp"
-#include "asio/detail/signal_blocker.hpp"
-#include "asio/detail/socket_ops.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace detail {
-
-#if defined(ASIO_HAS_IOCP)
-class select_reactor::thread_function
-{
-public:
- explicit thread_function(select_reactor* r)
- : this_(r)
- {
- }
-
- void operator()()
- {
- this_->run_thread();
- }
-
-private:
- select_reactor* this_;
-};
-#endif // defined(ASIO_HAS_IOCP)
-
-select_reactor::select_reactor(asio::execution_context& ctx)
- : execution_context_service_base<select_reactor>(ctx),
- scheduler_(use_service<scheduler_type>(ctx)),
- mutex_(),
- interrupter_(),
-#if defined(ASIO_HAS_IOCP)
- stop_thread_(false),
- thread_(0),
-#endif // defined(ASIO_HAS_IOCP)
- shutdown_(false)
-{
-#if defined(ASIO_HAS_IOCP)
- asio::detail::signal_blocker sb;
- thread_ = new asio::detail::thread(thread_function(this));
-#endif // defined(ASIO_HAS_IOCP)
-}
-
-select_reactor::~select_reactor()
-{
- shutdown();
-}
-
-void select_reactor::shutdown()
-{
- asio::detail::mutex::scoped_lock lock(mutex_);
- shutdown_ = true;
-#if defined(ASIO_HAS_IOCP)
- stop_thread_ = true;
-#endif // defined(ASIO_HAS_IOCP)
- lock.unlock();
-
-#if defined(ASIO_HAS_IOCP)
- if (thread_)
- {
- interrupter_.interrupt();
- thread_->join();
- delete thread_;
- thread_ = 0;
- }
-#endif // defined(ASIO_HAS_IOCP)
-
- op_queue<operation> ops;
-
- for (int i = 0; i < max_ops; ++i)
- op_queue_[i].get_all_operations(ops);
-
- timer_queues_.get_all_timers(ops);
-
- scheduler_.abandon_operations(ops);
-}
-
-void select_reactor::notify_fork(
- asio::execution_context::fork_event fork_ev)
-{
- if (fork_ev == asio::execution_context::fork_child)
- interrupter_.recreate();
-}
-
-void select_reactor::init_task()
-{
- scheduler_.init_task();
-}
-
-int select_reactor::register_descriptor(socket_type,
- select_reactor::per_descriptor_data&)
-{
- return 0;
-}
-
-int select_reactor::register_internal_descriptor(
- int op_type, socket_type descriptor,
- select_reactor::per_descriptor_data&, reactor_op* op)
-{
- asio::detail::mutex::scoped_lock lock(mutex_);
-
- op_queue_[op_type].enqueue_operation(descriptor, op);
- interrupter_.interrupt();
-
- return 0;
-}
-
-void select_reactor::move_descriptor(socket_type,
- select_reactor::per_descriptor_data&,
- select_reactor::per_descriptor_data&)
-{
-}
-
-void select_reactor::start_op(int op_type, socket_type descriptor,
- select_reactor::per_descriptor_data&, reactor_op* op,
- bool is_continuation, bool)
-{
- asio::detail::mutex::scoped_lock lock(mutex_);
-
- if (shutdown_)
- {
- post_immediate_completion(op, is_continuation);
- return;
- }
-
- bool first = op_queue_[op_type].enqueue_operation(descriptor, op);
- scheduler_.work_started();
- if (first)
- interrupter_.interrupt();
-}
-
-void select_reactor::cancel_ops(socket_type descriptor,
- select_reactor::per_descriptor_data&)
-{
- asio::detail::mutex::scoped_lock lock(mutex_);
- cancel_ops_unlocked(descriptor, asio::error::operation_aborted);
-}
-
-void select_reactor::deregister_descriptor(socket_type descriptor,
- select_reactor::per_descriptor_data&, bool)
-{
- asio::detail::mutex::scoped_lock lock(mutex_);
- cancel_ops_unlocked(descriptor, asio::error::operation_aborted);
-}
-
-void select_reactor::deregister_internal_descriptor(
- socket_type descriptor, select_reactor::per_descriptor_data&)
-{
- asio::detail::mutex::scoped_lock lock(mutex_);
- op_queue<operation> ops;
- for (int i = 0; i < max_ops; ++i)
- op_queue_[i].cancel_operations(descriptor, ops);
-}
-
-void select_reactor::cleanup_descriptor_data(
- select_reactor::per_descriptor_data&)
-{
-}
-
-void select_reactor::run(long usec, op_queue<operation>& ops)
-{
- asio::detail::mutex::scoped_lock lock(mutex_);
-
-#if defined(ASIO_HAS_IOCP)
- // Check if the thread is supposed to stop.
- if (stop_thread_)
- return;
-#endif // defined(ASIO_HAS_IOCP)
-
- // Set up the descriptor sets.
- for (int i = 0; i < max_select_ops; ++i)
- fd_sets_[i].reset();
- fd_sets_[read_op].set(interrupter_.read_descriptor());
- socket_type max_fd = 0;
- bool have_work_to_do = !timer_queues_.all_empty();
- for (int i = 0; i < max_select_ops; ++i)
- {
- have_work_to_do = have_work_to_do || !op_queue_[i].empty();
- fd_sets_[i].set(op_queue_[i], ops);
- if (fd_sets_[i].max_descriptor() > max_fd)
- max_fd = fd_sets_[i].max_descriptor();
- }
-
-#if defined(ASIO_WINDOWS) || defined(__CYGWIN__)
- // Connection operations on Windows use both except and write fd_sets.
- have_work_to_do = have_work_to_do || !op_queue_[connect_op].empty();
- fd_sets_[write_op].set(op_queue_[connect_op], ops);
- if (fd_sets_[write_op].max_descriptor() > max_fd)
- max_fd = fd_sets_[write_op].max_descriptor();
- fd_sets_[except_op].set(op_queue_[connect_op], ops);
- if (fd_sets_[except_op].max_descriptor() > max_fd)
- max_fd = fd_sets_[except_op].max_descriptor();
-#endif // defined(ASIO_WINDOWS) || defined(__CYGWIN__)
-
- // We can return immediately if there's no work to do and the reactor is
- // not supposed to block.
- if (!usec && !have_work_to_do)
- return;
-
- // Determine how long to block while waiting for events.
- timeval tv_buf = { 0, 0 };
- timeval* tv = usec ? get_timeout(usec, tv_buf) : &tv_buf;
-
- lock.unlock();
-
- // Block on the select call until descriptors become ready.
- asio::error_code ec;
- int retval = socket_ops::select(static_cast<int>(max_fd + 1),
- fd_sets_[read_op], fd_sets_[write_op], fd_sets_[except_op], tv, ec);
-
- // Reset the interrupter.
- if (retval > 0 && fd_sets_[read_op].is_set(interrupter_.read_descriptor()))
- {
- interrupter_.reset();
- --retval;
- }
-
- lock.lock();
-
- // Dispatch all ready operations.
- if (retval > 0)
- {
-#if defined(ASIO_WINDOWS) || defined(__CYGWIN__)
- // Connection operations on Windows use both except and write fd_sets.
- fd_sets_[except_op].perform(op_queue_[connect_op], ops);
- fd_sets_[write_op].perform(op_queue_[connect_op], ops);
-#endif // defined(ASIO_WINDOWS) || defined(__CYGWIN__)
-
- // Exception operations must be processed first to ensure that any
- // out-of-band data is read before normal data.
- for (int i = max_select_ops - 1; i >= 0; --i)
- fd_sets_[i].perform(op_queue_[i], ops);
- }
- timer_queues_.get_ready_timers(ops);
-}
-
-void select_reactor::interrupt()
-{
- interrupter_.interrupt();
-}
-
-#if defined(ASIO_HAS_IOCP)
-void select_reactor::run_thread()
-{
- asio::detail::mutex::scoped_lock lock(mutex_);
- while (!stop_thread_)
- {
- lock.unlock();
- op_queue<operation> ops;
- run(true, ops);
- scheduler_.post_deferred_completions(ops);
- lock.lock();
- }
-}
-#endif // defined(ASIO_HAS_IOCP)
-
-void select_reactor::do_add_timer_queue(timer_queue_base& queue)
-{
- mutex::scoped_lock lock(mutex_);
- timer_queues_.insert(&queue);
-}
-
-void select_reactor::do_remove_timer_queue(timer_queue_base& queue)
-{
- mutex::scoped_lock lock(mutex_);
- timer_queues_.erase(&queue);
-}
-
-timeval* select_reactor::get_timeout(long usec, timeval& tv)
-{
- // By default we will wait no longer than 5 minutes. This will ensure that
- // any changes to the system clock are detected after no longer than this.
- const long max_usec = 5 * 60 * 1000 * 1000;
- usec = timer_queues_.wait_duration_usec(
- (usec < 0 || max_usec < usec) ? max_usec : usec);
- tv.tv_sec = usec / 1000000;
- tv.tv_usec = usec % 1000000;
- return &tv;
-}
-
-void select_reactor::cancel_ops_unlocked(socket_type descriptor,
- const asio::error_code& ec)
-{
- bool need_interrupt = false;
- op_queue<operation> ops;
- for (int i = 0; i < max_ops; ++i)
- need_interrupt = op_queue_[i].cancel_operations(
- descriptor, ops, ec) || need_interrupt;
- scheduler_.post_deferred_completions(ops);
- if (need_interrupt)
- interrupter_.interrupt();
-}
-
-} // namespace detail
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // defined(ASIO_HAS_IOCP)
- // || (!defined(ASIO_HAS_DEV_POLL)
- // && !defined(ASIO_HAS_EPOLL)
- // && !defined(ASIO_HAS_KQUEUE))
- // && !defined(ASIO_WINDOWS_RUNTIME))
-
-#endif // ASIO_DETAIL_IMPL_SELECT_REACTOR_IPP