FM / impl

/usr/include/boost/asio/detail/impl

Name	Size	Mode	Actions
buffer_sequence_adapter.ipp	3096	0644	edit dl rm
descriptor_ops.ipp	15091	0644	edit dl rm
dev_poll_reactor.hpp	2587	0644	edit dl rm
dev_poll_reactor.ipp	13138	0644	edit dl rm
epoll_reactor.hpp	2439	0644	edit dl rm
epoll_reactor.ipp	22372	0644	edit dl rm
eventfd_select_interrupter.ipp	4598	0644	edit dl rm
handler_tracking.ipp	11782	0644	edit dl rm
kqueue_reactor.hpp	2590	0644	edit dl rm
kqueue_reactor.ipp	17045	0644	edit dl rm
null_event.ipp	1906	0644	edit dl rm
pipe_select_interrupter.ipp	3176	0644	edit dl rm
posix_event.ipp	1776	0644	edit dl rm
posix_mutex.ipp	1235	0644	edit dl rm
posix_thread.ipp	1964	0644	edit dl rm
posix_tss_ptr.ipp	1261	0644	edit dl rm
reactive_descriptor_service.ipp	6388	0644	edit dl rm
reactive_serial_port_service.ipp	4278	0644	edit dl rm
reactive_socket_service_base.ipp	8802	0644	edit dl rm
resolver_service_base.ipp	3891	0644	edit dl rm
scheduler.ipp	15892	0644	edit dl rm
select_reactor.hpp	2985	0644	edit dl rm
select_reactor.ipp	9352	0644	edit dl rm
service_registry.hpp	2652	0644	edit dl rm
service_registry.ipp	5462	0644	edit dl rm
signal_set_service.ipp	20376	0644	edit dl rm
socket_ops.ipp	113798	0644	edit dl rm
socket_select_interrupter.ipp	5858	0644	edit dl rm
strand_executor_service.hpp	11570	0644	edit dl rm
strand_executor_service.ipp	3637	0644	edit dl rm
strand_service.hpp	3574	0644	edit dl rm
strand_service.ipp	5037	0644	edit dl rm
throw_error.ipp	1268	0644	edit dl rm
timer_queue_ptime.ipp	2410	0644	edit dl rm
timer_queue_set.ipp	2317	0644	edit dl rm
winrt_ssocket_service_base.ipp	17513	0644	edit dl rm
winrt_timer_scheduler.hpp	2664	0644	edit dl rm
winrt_timer_scheduler.ipp	2962	0644	edit dl rm
winsock_init.ipp	2050	0644	edit dl rm
win_event.ipp	2068	0644	edit dl rm
win_iocp_handle_service.ipp	14394	0644	edit dl rm
win_iocp_io_context.hpp	3026	0644	edit dl rm
win_iocp_io_context.ipp	16634	0644	edit dl rm
win_iocp_serial_port_service.ipp	6021	0644	edit dl rm
win_iocp_socket_service_base.ipp	25041	0644	edit dl rm
win_mutex.ipp	2213	0644	edit dl rm
win_object_handle_service.ipp	12495	0644	edit dl rm
win_static_mutex.ipp	3636	0644	edit dl rm
win_thread.ipp	4102	0644	edit dl rm
win_tss_ptr.ipp	1448	0644	edit dl rm

Edit: /usr/include/boost/asio/detail/impl/strand_service.ipp (5037B)

//
// detail/impl/strand_service.ipp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2020 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 BOOST_ASIO_DETAIL_IMPL_STRAND_SERVICE_IPP
#define BOOST_ASIO_DETAIL_IMPL_STRAND_SERVICE_IPP

#if defined(_MSC_VER) && (_MSC_VER >= 1200)
# pragma once
#endif // defined(_MSC_VER) && (_MSC_VER >= 1200)

#include <boost/asio/detail/config.hpp>
#include <boost/asio/detail/call_stack.hpp>
#include <boost/asio/detail/strand_service.hpp>

#include <boost/asio/detail/push_options.hpp>

namespace boost {
namespace asio {
namespace detail {

struct strand_service::on_do_complete_exit
{
  io_context_impl* owner_;
  strand_impl* impl_;

~on_do_complete_exit()
  {
    impl_->mutex_.lock();
    impl_->ready_queue_.push(impl_->waiting_queue_);
    bool more_handlers = impl_->locked_ = !impl_->ready_queue_.empty();
    impl_->mutex_.unlock();

if (more_handlers)
      owner_->post_immediate_completion(impl_, true);
  }
};

strand_service::strand_service(boost::asio::io_context& io_context)
  : boost::asio::detail::service_base<strand_service>(io_context),
    io_context_(io_context),
    io_context_impl_(boost::asio::use_service<io_context_impl>(io_context)),
    mutex_(),
    salt_(0)
{
}

void strand_service::shutdown()
{
  op_queue<operation> ops;

boost::asio::detail::mutex::scoped_lock lock(mutex_);

for (std::size_t i = 0; i < num_implementations; ++i)
  {
    if (strand_impl* impl = implementations_[i].get())
    {
      ops.push(impl->waiting_queue_);
      ops.push(impl->ready_queue_);
    }
  }
}

void strand_service::construct(strand_service::implementation_type& impl)
{
  boost::asio::detail::mutex::scoped_lock lock(mutex_);

std::size_t salt = salt_++;
#if defined(BOOST_ASIO_ENABLE_SEQUENTIAL_STRAND_ALLOCATION)
  std::size_t index = salt;
#else // defined(BOOST_ASIO_ENABLE_SEQUENTIAL_STRAND_ALLOCATION)
  std::size_t index = reinterpret_cast<std::size_t>(&impl);
  index += (reinterpret_cast<std::size_t>(&impl) >> 3);
  index ^= salt + 0x9e3779b9 + (index << 6) + (index >> 2);
#endif // defined(BOOST_ASIO_ENABLE_SEQUENTIAL_STRAND_ALLOCATION)
  index = index % num_implementations;

if (!implementations_[index].get())
    implementations_[index].reset(new strand_impl);
  impl = implementations_[index].get();
}

bool strand_service::running_in_this_thread(
    const implementation_type& impl) const
{
  return call_stack<strand_impl>::contains(impl) != 0;
}

bool strand_service::do_dispatch(implementation_type& impl, operation* op)
{
  // If we are running inside the io_context, and no other handler already
  // holds the strand lock, then the handler can run immediately.
  bool can_dispatch = io_context_impl_.can_dispatch();
  impl->mutex_.lock();
  if (can_dispatch && !impl->locked_)
  {
    // Immediate invocation is allowed.
    impl->locked_ = true;
    impl->mutex_.unlock();
    return true;
  }

if (impl->locked_)
  {
    // Some other handler already holds the strand lock. Enqueue for later.
    impl->waiting_queue_.push(op);
    impl->mutex_.unlock();
  }
  else
  {
    // The handler is acquiring the strand lock and so is responsible for
    // scheduling the strand.
    impl->locked_ = true;
    impl->mutex_.unlock();
    impl->ready_queue_.push(op);
    io_context_impl_.post_immediate_completion(impl, false);
  }

return false;
}

void strand_service::do_post(implementation_type& impl,
    operation* op, bool is_continuation)
{
  impl->mutex_.lock();
  if (impl->locked_)
  {
    // Some other handler already holds the strand lock. Enqueue for later.
    impl->waiting_queue_.push(op);
    impl->mutex_.unlock();
  }
  else
  {
    // The handler is acquiring the strand lock and so is responsible for
    // scheduling the strand.
    impl->locked_ = true;
    impl->mutex_.unlock();
    impl->ready_queue_.push(op);
    io_context_impl_.post_immediate_completion(impl, is_continuation);
  }
}

void strand_service::do_complete(void* owner, operation* base,
    const boost::system::error_code& ec, std::size_t /*bytes_transferred*/)
{
  if (owner)
  {
    strand_impl* impl = static_cast<strand_impl*>(base);

// Indicate that this strand is executing on the current thread.
    call_stack<strand_impl>::context ctx(impl);

// Ensure the next handler, if any, is scheduled on block exit.
    on_do_complete_exit on_exit;
    on_exit.owner_ = static_cast<io_context_impl*>(owner);
    on_exit.impl_ = impl;

// Run all ready handlers. No lock is required since the ready queue is
    // accessed only within the strand.
    while (operation* o = impl->ready_queue_.front())
    {
      impl->ready_queue_.pop();
      o->complete(owner, ec, 0);
    }
  }
}

} // namespace detail
} // namespace asio
} // namespace boost

#include <boost/asio/detail/pop_options.hpp>

#endif // BOOST_ASIO_DETAIL_IMPL_STRAND_SERVICE_IPP

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