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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/strand_executor_service.ipp
parent558d74bffd9f069955af52c0b308a1d6169bcff0 (diff)
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Merge lime output into next branch
Diffstat (limited to 'lib/asio/detail/impl/strand_executor_service.ipp')
-rw-r--r--lib/asio/detail/impl/strand_executor_service.ipp134
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diff --git a/lib/asio/detail/impl/strand_executor_service.ipp b/lib/asio/detail/impl/strand_executor_service.ipp
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-//
-// detail/impl/strand_executor_service.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_STRAND_EXECUTOR_SERVICE_IPP
-#define ASIO_DETAIL_IMPL_STRAND_EXECUTOR_SERVICE_IPP
-
-#if defined(_MSC_VER) && (_MSC_VER >= 1200)
-# pragma once
-#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)
-
-#include "asio/detail/config.hpp"
-#include "asio/detail/strand_executor_service.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace detail {
-
-strand_executor_service::strand_executor_service(execution_context& ctx)
- : execution_context_service_base<strand_executor_service>(ctx),
- mutex_(),
- salt_(0),
- impl_list_(0)
-{
-}
-
-void strand_executor_service::shutdown()
-{
- op_queue<scheduler_operation> ops;
-
- asio::detail::mutex::scoped_lock lock(mutex_);
-
- strand_impl* impl = impl_list_;
- while (impl)
- {
- impl->mutex_->lock();
- impl->shutdown_ = true;
- ops.push(impl->waiting_queue_);
- ops.push(impl->ready_queue_);
- impl->mutex_->unlock();
- impl = impl->next_;
- }
-}
-
-strand_executor_service::implementation_type
-strand_executor_service::create_implementation()
-{
- implementation_type new_impl(new strand_impl);
- new_impl->locked_ = false;
- new_impl->shutdown_ = false;
-
- asio::detail::mutex::scoped_lock lock(mutex_);
-
- // Select a mutex from the pool of shared mutexes.
- std::size_t salt = salt_++;
- std::size_t mutex_index = reinterpret_cast<std::size_t>(new_impl.get());
- mutex_index += (reinterpret_cast<std::size_t>(new_impl.get()) >> 3);
- mutex_index ^= salt + 0x9e3779b9 + (mutex_index << 6) + (mutex_index >> 2);
- mutex_index = mutex_index % num_mutexes;
- if (!mutexes_[mutex_index].get())
- mutexes_[mutex_index].reset(new mutex);
- new_impl->mutex_ = mutexes_[mutex_index].get();
-
- // Insert implementation into linked list of all implementations.
- new_impl->next_ = impl_list_;
- new_impl->prev_ = 0;
- if (impl_list_)
- impl_list_->prev_ = new_impl.get();
- impl_list_ = new_impl.get();
- new_impl->service_ = this;
-
- return new_impl;
-}
-
-strand_executor_service::strand_impl::~strand_impl()
-{
- asio::detail::mutex::scoped_lock lock(service_->mutex_);
-
- // Remove implementation from linked list of all implementations.
- if (service_->impl_list_ == this)
- service_->impl_list_ = next_;
- if (prev_)
- prev_->next_ = next_;
- if (next_)
- next_->prev_= prev_;
-}
-
-bool strand_executor_service::enqueue(const implementation_type& impl,
- scheduler_operation* op)
-{
- impl->mutex_->lock();
- if (impl->shutdown_)
- {
- impl->mutex_->unlock();
- op->destroy();
- return false;
- }
- else if (impl->locked_)
- {
- // Some other function already holds the strand lock. Enqueue for later.
- impl->waiting_queue_.push(op);
- impl->mutex_->unlock();
- return false;
- }
- else
- {
- // The function is acquiring the strand lock and so is responsible for
- // scheduling the strand.
- impl->locked_ = true;
- impl->mutex_->unlock();
- impl->ready_queue_.push(op);
- return true;
- }
-}
-
-bool strand_executor_service::running_in_this_thread(
- const implementation_type& impl)
-{
- return !!call_stack<strand_impl>::contains(impl.get());
-}
-
-} // namespace detail
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // ASIO_DETAIL_IMPL_STRAND_EXECUTOR_SERVICE_IPP