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//
// detail/win_iocp_socket_service_base.hpp
// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
//
// Copyright (c) 2003-2023 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_WIN_IOCP_SOCKET_SERVICE_BASE_HPP
#define ASIO_DETAIL_WIN_IOCP_SOCKET_SERVICE_BASE_HPP
#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)
#include "asio/associated_cancellation_slot.hpp"
#include "asio/error.hpp"
#include "asio/execution_context.hpp"
#include "asio/socket_base.hpp"
#include "asio/detail/bind_handler.hpp"
#include "asio/detail/buffer_sequence_adapter.hpp"
#include "asio/detail/fenced_block.hpp"
#include "asio/detail/handler_alloc_helpers.hpp"
#include "asio/detail/handler_invoke_helpers.hpp"
#include "asio/detail/memory.hpp"
#include "asio/detail/mutex.hpp"
#include "asio/detail/operation.hpp"
#include "asio/detail/reactor_op.hpp"
#include "asio/detail/select_reactor.hpp"
#include "asio/detail/socket_holder.hpp"
#include "asio/detail/socket_ops.hpp"
#include "asio/detail/socket_types.hpp"
#include "asio/detail/win_iocp_io_context.hpp"
#include "asio/detail/win_iocp_null_buffers_op.hpp"
#include "asio/detail/win_iocp_socket_connect_op.hpp"
#include "asio/detail/win_iocp_socket_send_op.hpp"
#include "asio/detail/win_iocp_socket_recv_op.hpp"
#include "asio/detail/win_iocp_socket_recvmsg_op.hpp"
#include "asio/detail/win_iocp_wait_op.hpp"
#include "asio/detail/push_options.hpp"
namespace asio {
namespace detail {
class win_iocp_socket_service_base
{
public:
// The implementation type of the socket.
struct base_implementation_type
{
// The native socket representation.
socket_type socket_;
// The current state of the socket.
socket_ops::state_type state_;
// We use a shared pointer as a cancellation token here to work around the
// broken Windows support for cancellation. MSDN says that when you call
// closesocket any outstanding WSARecv or WSASend operations will complete
// with the error ERROR_OPERATION_ABORTED. In practice they complete with
// ERROR_NETNAME_DELETED, which means you can't tell the difference between
// a local cancellation and the socket being hard-closed by the peer.
socket_ops::shared_cancel_token_type cancel_token_;
// Per-descriptor data used by the reactor.
select_reactor::per_descriptor_data reactor_data_;
#if defined(ASIO_ENABLE_CANCELIO)
// The ID of the thread from which it is safe to cancel asynchronous
// operations. 0 means no asynchronous operations have been started yet.
// ~0 means asynchronous operations have been started from more than one
// thread, and cancellation is not supported for the socket.
DWORD safe_cancellation_thread_id_;
#endif // defined(ASIO_ENABLE_CANCELIO)
// Pointers to adjacent socket implementations in linked list.
base_implementation_type* next_;
base_implementation_type* prev_;
};
// Constructor.
ASIO_DECL win_iocp_socket_service_base(execution_context& context);
// Destroy all user-defined handler objects owned by the service.
ASIO_DECL void base_shutdown();
// Construct a new socket implementation.
ASIO_DECL void construct(base_implementation_type& impl);
// Move-construct a new socket implementation.
ASIO_DECL void base_move_construct(base_implementation_type& impl,
base_implementation_type& other_impl) ASIO_NOEXCEPT;
// Move-assign from another socket implementation.
ASIO_DECL void base_move_assign(base_implementation_type& impl,
win_iocp_socket_service_base& other_service,
base_implementation_type& other_impl);
// Destroy a socket implementation.
ASIO_DECL void destroy(base_implementation_type& impl);
// Determine whether the socket is open.
bool is_open(const base_implementation_type& impl) const
{
return impl.socket_ != invalid_socket;
}
// Destroy a socket implementation.
ASIO_DECL asio::error_code close(
base_implementation_type& impl, asio::error_code& ec);
// Release ownership of the socket.
ASIO_DECL socket_type release(
base_implementation_type& impl, asio::error_code& ec);
// Cancel all operations associated with the socket.
ASIO_DECL asio::error_code cancel(
base_implementation_type& impl, asio::error_code& ec);
// Determine whether the socket is at the out-of-band data mark.
bool at_mark(const base_implementation_type& impl,
asio::error_code& ec) const
{
return socket_ops::sockatmark(impl.socket_, ec);
}
// Determine the number of bytes available for reading.
std::size_t available(const base_implementation_type& impl,
asio::error_code& ec) const
{
return socket_ops::available(impl.socket_, ec);
}
// Place the socket into the state where it will listen for new connections.
asio::error_code listen(base_implementation_type& impl,
int backlog, asio::error_code& ec)
{
socket_ops::listen(impl.socket_, backlog, ec);
return ec;
}
// Perform an IO control command on the socket.
template <typename IO_Control_Command>
asio::error_code io_control(base_implementation_type& impl,
IO_Control_Command& command, asio::error_code& ec)
{
socket_ops::ioctl(impl.socket_, impl.state_, command.name(),
static_cast<ioctl_arg_type*>(command.data()), ec);
return ec;
}
// Gets the non-blocking mode of the socket.
bool non_blocking(const base_implementation_type& impl) const
{
return (impl.state_ & socket_ops::user_set_non_blocking) != 0;
}
// Sets the non-blocking mode of the socket.
asio::error_code non_blocking(base_implementation_type& impl,
bool mode, asio::error_code& ec)
{
socket_ops::set_user_non_blocking(impl.socket_, impl.state_, mode, ec);
return ec;
}
// Gets the non-blocking mode of the native socket implementation.
bool native_non_blocking(const base_implementation_type& impl) const
{
return (impl.state_ & socket_ops::internal_non_blocking) != 0;
}
// Sets the non-blocking mode of the native socket implementation.
asio::error_code native_non_blocking(base_implementation_type& impl,
bool mode, asio::error_code& ec)
{
socket_ops::set_internal_non_blocking(impl.socket_, impl.state_, mode, ec);
return ec;
}
// Wait for the socket to become ready to read, ready to write, or to have
// pending error conditions.
asio::error_code wait(base_implementation_type& impl,
socket_base::wait_type w, asio::error_code& ec)
{
switch (w)
{
case socket_base::wait_read:
socket_ops::poll_read(impl.socket_, impl.state_, -1, ec);
break;
case socket_base::wait_write:
socket_ops::poll_write(impl.socket_, impl.state_, -1, ec);
break;
case socket_base::wait_error:
socket_ops::poll_error(impl.socket_, impl.state_, -1, ec);
break;
default:
ec = asio::error::invalid_argument;
break;
}
return ec;
}
// Asynchronously wait for the socket to become ready to read, ready to
// write, or to have pending error conditions.
template <typename Handler, typename IoExecutor>
void async_wait(base_implementation_type& impl,
socket_base::wait_type w, Handler& handler, const IoExecutor& io_ex)
{
typename associated_cancellation_slot<Handler>::type slot
= asio::get_associated_cancellation_slot(handler);
bool is_continuation =
asio_handler_cont_helpers::is_continuation(handler);
// Allocate and construct an operation to wrap the handler.
typedef win_iocp_wait_op<Handler, IoExecutor> op;
typename op::ptr p = { asio::detail::addressof(handler),
op::ptr::allocate(handler), 0 };
p.p = new (p.v) op(impl.cancel_token_, handler, io_ex);
ASIO_HANDLER_CREATION((context_, *p.p, "socket",
&impl, impl.socket_, "async_wait"));
// Optionally register for per-operation cancellation.
operation* iocp_op = p.p;
if (slot.is_connected())
{
p.p->cancellation_key_ = iocp_op =
&slot.template emplace<reactor_op_cancellation>(
impl.socket_, iocp_op);
}
int op_type = -1;
switch (w)
{
case socket_base::wait_read:
op_type = start_null_buffers_receive_op(impl, 0, p.p, iocp_op);
break;
case socket_base::wait_write:
op_type = select_reactor::write_op;
start_reactor_op(impl, select_reactor::write_op, p.p);
break;
case socket_base::wait_error:
op_type = select_reactor::read_op;
start_reactor_op(impl, select_reactor::except_op, p.p);
break;
default:
p.p->ec_ = asio::error::invalid_argument;
iocp_service_.post_immediate_completion(p.p, is_continuation);
break;
}
p.v = p.p = 0;
// Update cancellation method if the reactor was used.
if (slot.is_connected() && op_type != -1)
{
static_cast<reactor_op_cancellation*>(iocp_op)->use_reactor(
&get_reactor(), &impl.reactor_data_, op_type);
}
}
// Send the given data to the peer. Returns the number of bytes sent.
template <typename ConstBufferSequence>
size_t send(base_implementation_type& impl,
const ConstBufferSequence& buffers,
socket_base::message_flags flags, asio::error_code& ec)
{
buffer_sequence_adapter<asio::const_buffer,
ConstBufferSequence> bufs(buffers);
return socket_ops::sync_send(impl.socket_, impl.state_,
bufs.buffers(), bufs.count(), flags, bufs.all_empty(), ec);
}
// Wait until data can be sent without blocking.
size_t send(base_implementation_type& impl, const null_buffers&,
socket_base::message_flags, asio::error_code& ec)
{
// Wait for socket to become ready.
socket_ops::poll_write(impl.socket_, impl.state_, -1, ec);
return 0;
}
// Start an asynchronous send. The data being sent must be valid for the
// lifetime of the asynchronous operation.
template <typename ConstBufferSequence, typename Handler, typename IoExecutor>
void async_send(base_implementation_type& impl,
const ConstBufferSequence& buffers, socket_base::message_flags flags,
Handler& handler, const IoExecutor& io_ex)
{
typename associated_cancellation_slot<Handler>::type slot
= asio::get_associated_cancellation_slot(handler);
// Allocate and construct an operation to wrap the handler.
typedef win_iocp_socket_send_op<
ConstBufferSequence, Handler, IoExecutor> op;
typename op::ptr p = { asio::detail::addressof(handler),
op::ptr::allocate(handler), 0 };
operation* o = p.p = new (p.v) op(
impl.cancel_token_, buffers, handler, io_ex);
ASIO_HANDLER_CREATION((context_, *p.p, "socket",
&impl, impl.socket_, "async_send"));
buffer_sequence_adapter<asio::const_buffer,
ConstBufferSequence> bufs(buffers);
// Optionally register for per-operation cancellation.
if (slot.is_connected())
o = &slot.template emplace<iocp_op_cancellation>(impl.socket_, o);
start_send_op(impl, bufs.buffers(), bufs.count(), flags,
(impl.state_ & socket_ops::stream_oriented) != 0 && bufs.all_empty(),
o);
p.v = p.p = 0;
}
// Start an asynchronous wait until data can be sent without blocking.
template <typename Handler, typename IoExecutor>
void async_send(base_implementation_type& impl, const null_buffers&,
socket_base::message_flags, Handler& handler, const IoExecutor& io_ex)
{
// Allocate and construct an operation to wrap the handler.
typedef win_iocp_null_buffers_op<Handler, IoExecutor> op;
typename op::ptr p = { asio::detail::addressof(handler),
op::ptr::allocate(handler), 0 };
p.p = new (p.v) op(impl.cancel_token_, handler, io_ex);
ASIO_HANDLER_CREATION((context_, *p.p, "socket",
&impl, impl.socket_, "async_send(null_buffers)"));
start_reactor_op(impl, select_reactor::write_op, p.p);
p.v = p.p = 0;
}
// Receive some data from the peer. Returns the number of bytes received.
template <typename MutableBufferSequence>
size_t receive(base_implementation_type& impl,
const MutableBufferSequence& buffers,
socket_base::message_flags flags, asio::error_code& ec)
{
buffer_sequence_adapter<asio::mutable_buffer,
MutableBufferSequence> bufs(buffers);
return socket_ops::sync_recv(impl.socket_, impl.state_,
bufs.buffers(), bufs.count(), flags, bufs.all_empty(), ec);
}
// Wait until data can be received without blocking.
size_t receive(base_implementation_type& impl, const null_buffers&,
socket_base::message_flags, asio::error_code& ec)
{
// Wait for socket to become ready.
socket_ops::poll_read(impl.socket_, impl.state_, -1, ec);
return 0;
}
// Start an asynchronous receive. The buffer for the data being received
// must be valid for the lifetime of the asynchronous operation.
template <typename MutableBufferSequence,
typename Handler, typename IoExecutor>
void async_receive(base_implementation_type& impl,
const MutableBufferSequence& buffers, socket_base::message_flags flags,
Handler& handler, const IoExecutor& io_ex)
{
typename associated_cancellation_slot<Handler>::type slot
= asio::get_associated_cancellation_slot(handler);
// Allocate and construct an operation to wrap the handler.
typedef win_iocp_socket_recv_op<
MutableBufferSequence, Handler, IoExecutor> op;
typename op::ptr p = { asio::detail::addressof(handler),
op::ptr::allocate(handler), 0 };
operation* o = p.p = new (p.v) op(impl.state_,
impl.cancel_token_, buffers, handler, io_ex);
ASIO_HANDLER_CREATION((context_, *p.p, "socket",
&impl, impl.socket_, "async_receive"));
buffer_sequence_adapter<asio::mutable_buffer,
MutableBufferSequence> bufs(buffers);
// Optionally register for per-operation cancellation.
if (slot.is_connected())
o = &slot.template emplace<iocp_op_cancellation>(impl.socket_, o);
start_receive_op(impl, bufs.buffers(), bufs.count(), flags,
(impl.state_ & socket_ops::stream_oriented) != 0 && bufs.all_empty(),
o);
p.v = p.p = 0;
}
// Wait until data can be received without blocking.
template <typename Handler, typename IoExecutor>
void async_receive(base_implementation_type& impl,
const null_buffers&, socket_base::message_flags flags,
Handler& handler, const IoExecutor& io_ex)
{
typename associated_cancellation_slot<Handler>::type slot
= asio::get_associated_cancellation_slot(handler);
// Allocate and construct an operation to wrap the handler.
typedef win_iocp_null_buffers_op<Handler, IoExecutor> op;
typename op::ptr p = { asio::detail::addressof(handler),
op::ptr::allocate(handler), 0 };
p.p = new (p.v) op(impl.cancel_token_, handler, io_ex);
ASIO_HANDLER_CREATION((context_, *p.p, "socket",
&impl, impl.socket_, "async_receive(null_buffers)"));
// Optionally register for per-operation cancellation.
operation* iocp_op = p.p;
if (slot.is_connected())
{
p.p->cancellation_key_ = iocp_op =
&slot.template emplace<reactor_op_cancellation>(
impl.socket_, iocp_op);
}
int op_type = start_null_buffers_receive_op(impl, flags, p.p, iocp_op);
p.v = p.p = 0;
// Update cancellation method if the reactor was used.
if (slot.is_connected() && op_type != -1)
{
static_cast<reactor_op_cancellation*>(iocp_op)->use_reactor(
&get_reactor(), &impl.reactor_data_, op_type);
}
}
// Receive some data with associated flags. Returns the number of bytes
// received.
template <typename MutableBufferSequence>
size_t receive_with_flags(base_implementation_type& impl,
const MutableBufferSequence& buffers,
socket_base::message_flags in_flags,
socket_base::message_flags& out_flags, asio::error_code& ec)
{
buffer_sequence_adapter<asio::mutable_buffer,
MutableBufferSequence> bufs(buffers);
return socket_ops::sync_recvmsg(impl.socket_, impl.state_,
bufs.buffers(), bufs.count(), in_flags, out_flags, ec);
}
// Wait until data can be received without blocking.
size_t receive_with_flags(base_implementation_type& impl,
const null_buffers&, socket_base::message_flags,
socket_base::message_flags& out_flags, asio::error_code& ec)
{
// Wait for socket to become ready.
socket_ops::poll_read(impl.socket_, impl.state_, -1, ec);
// Clear out_flags, since we cannot give it any other sensible value when
// performing a null_buffers operation.
out_flags = 0;
return 0;
}
// Start an asynchronous receive. The buffer for the data being received
// must be valid for the lifetime of the asynchronous operation.
template <typename MutableBufferSequence,
typename Handler, typename IoExecutor>
void async_receive_with_flags(base_implementation_type& impl,
const MutableBufferSequence& buffers, socket_base::message_flags in_flags,
socket_base::message_flags& out_flags, Handler& handler,
const IoExecutor& io_ex)
{
typename associated_cancellation_slot<Handler>::type slot
= asio::get_associated_cancellation_slot(handler);
// Allocate and construct an operation to wrap the handler.
typedef win_iocp_socket_recvmsg_op<
MutableBufferSequence, Handler, IoExecutor> op;
typename op::ptr p = { asio::detail::addressof(handler),
op::ptr::allocate(handler), 0 };
operation* o = p.p = new (p.v) op(impl.cancel_token_,
buffers, out_flags, handler, io_ex);
ASIO_HANDLER_CREATION((context_, *p.p, "socket",
&impl, impl.socket_, "async_receive_with_flags"));
buffer_sequence_adapter<asio::mutable_buffer,
MutableBufferSequence> bufs(buffers);
// Optionally register for per-operation cancellation.
if (slot.is_connected())
o = &slot.template emplace<iocp_op_cancellation>(impl.socket_, o);
start_receive_op(impl, bufs.buffers(), bufs.count(), in_flags, false, o);
p.v = p.p = 0;
}
// Wait until data can be received without blocking.
template <typename Handler, typename IoExecutor>
void async_receive_with_flags(base_implementation_type& impl,
const null_buffers&, socket_base::message_flags in_flags,
socket_base::message_flags& out_flags, Handler& handler,
const IoExecutor& io_ex)
{
typename associated_cancellation_slot<Handler>::type slot
= asio::get_associated_cancellation_slot(handler);
// Allocate and construct an operation to wrap the handler.
typedef win_iocp_null_buffers_op<Handler, IoExecutor> op;
typename op::ptr p = { asio::detail::addressof(handler),
op::ptr::allocate(handler), 0 };
p.p = new (p.v) op(impl.cancel_token_, handler, io_ex);
ASIO_HANDLER_CREATION((context_, *p.p, "socket",
&impl, impl.socket_, "async_receive_with_flags(null_buffers)"));
// Reset out_flags since it can be given no sensible value at this time.
out_flags = 0;
// Optionally register for per-operation cancellation.
operation* iocp_op = p.p;
if (slot.is_connected())
{
p.p->cancellation_key_ = iocp_op =
&slot.template emplace<reactor_op_cancellation>(
impl.socket_, iocp_op);
}
int op_type = start_null_buffers_receive_op(impl, in_flags, p.p, iocp_op);
p.v = p.p = 0;
// Update cancellation method if the reactor was used.
if (slot.is_connected() && op_type != -1)
{
static_cast<reactor_op_cancellation*>(iocp_op)->use_reactor(
&get_reactor(), &impl.reactor_data_, op_type);
}
}
// Helper function to restart an asynchronous accept operation.
ASIO_DECL void restart_accept_op(socket_type s,
socket_holder& new_socket, int family, int type,
int protocol, void* output_buffer, DWORD address_length,
long* cancel_requested, operation* op);
protected:
// Open a new socket implementation.
ASIO_DECL asio::error_code do_open(
base_implementation_type& impl, int family, int type,
int protocol, asio::error_code& ec);
// Assign a native socket to a socket implementation.
ASIO_DECL asio::error_code do_assign(
base_implementation_type& impl, int type,
socket_type native_socket, asio::error_code& ec);
// Helper function to start an asynchronous send operation.
ASIO_DECL void start_send_op(base_implementation_type& impl,
WSABUF* buffers, std::size_t buffer_count,
socket_base::message_flags flags, bool noop, operation* op);
// Helper function to start an asynchronous send_to operation.
ASIO_DECL void start_send_to_op(base_implementation_type& impl,
WSABUF* buffers, std::size_t buffer_count, const void* addr,
int addrlen, socket_base::message_flags flags, operation* op);
// Helper function to start an asynchronous receive operation.
ASIO_DECL void start_receive_op(base_implementation_type& impl,
WSABUF* buffers, std::size_t buffer_count,
socket_base::message_flags flags, bool noop, operation* op);
// Helper function to start an asynchronous null_buffers receive operation.
ASIO_DECL int start_null_buffers_receive_op(
base_implementation_type& impl, socket_base::message_flags flags,
reactor_op* op, operation* iocp_op);
// Helper function to start an asynchronous receive_from operation.
ASIO_DECL void start_receive_from_op(base_implementation_type& impl,
WSABUF* buffers, std::size_t buffer_count, void* addr,
socket_base::message_flags flags, int* addrlen, operation* op);
// Helper function to start an asynchronous accept operation.
ASIO_DECL void start_accept_op(base_implementation_type& impl,
bool peer_is_open, socket_holder& new_socket, int family, int type,
int protocol, void* output_buffer, DWORD address_length, operation* op);
// Start an asynchronous read or write operation using the reactor.
ASIO_DECL void start_reactor_op(base_implementation_type& impl,
int op_type, reactor_op* op);
// Start the asynchronous connect operation using the reactor.
ASIO_DECL int start_connect_op(base_implementation_type& impl,
int family, int type, const void* remote_addr, std::size_t remote_addrlen,
win_iocp_socket_connect_op_base* op, operation* iocp_op);
// Helper function to close a socket when the associated object is being
// destroyed.
ASIO_DECL void close_for_destruction(base_implementation_type& impl);
// Update the ID of the thread from which cancellation is safe.
ASIO_DECL void update_cancellation_thread_id(
base_implementation_type& impl);
// Helper function to get the reactor. If no reactor has been created yet, a
// new one is obtained from the execution context and a pointer to it is
// cached in this service.
ASIO_DECL select_reactor& get_reactor();
// The type of a ConnectEx function pointer, as old SDKs may not provide it.
typedef BOOL (PASCAL *connect_ex_fn)(SOCKET,
const socket_addr_type*, int, void*, DWORD, DWORD*, OVERLAPPED*);
// Helper function to get the ConnectEx pointer. If no ConnectEx pointer has
// been obtained yet, one is obtained using WSAIoctl and the pointer is
// cached. Returns a null pointer if ConnectEx is not available.
ASIO_DECL connect_ex_fn get_connect_ex(
base_implementation_type& impl, int type);
// The type of a NtSetInformationFile function pointer.
typedef LONG (NTAPI *nt_set_info_fn)(HANDLE, ULONG_PTR*, void*, ULONG, ULONG);
// Helper function to get the NtSetInformationFile function pointer. If no
// NtSetInformationFile pointer has been obtained yet, one is obtained using
// GetProcAddress and the pointer is cached. Returns a null pointer if
// NtSetInformationFile is not available.
ASIO_DECL nt_set_info_fn get_nt_set_info();
// Helper function to emulate InterlockedCompareExchangePointer functionality
// for:
// - very old Platform SDKs; and
// - platform SDKs where MSVC's /Wp64 option causes spurious warnings.
ASIO_DECL void* interlocked_compare_exchange_pointer(
void** dest, void* exch, void* cmp);
// Helper function to emulate InterlockedExchangePointer functionality for:
// - very old Platform SDKs; and
// - platform SDKs where MSVC's /Wp64 option causes spurious warnings.
ASIO_DECL void* interlocked_exchange_pointer(void** dest, void* val);
// Helper class used to implement per operation cancellation.
class iocp_op_cancellation : public operation
{
public:
iocp_op_cancellation(SOCKET s, operation* target)
: operation(&iocp_op_cancellation::do_complete),
socket_(s),
target_(target)
{
}
static void do_complete(void* owner, operation* base,
const asio::error_code& result_ec,
std::size_t bytes_transferred)
{
iocp_op_cancellation* o = static_cast<iocp_op_cancellation*>(base);
o->target_->complete(owner, result_ec, bytes_transferred);
}
void operator()(cancellation_type_t type)
{
#if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600)
if (!!(type &
(cancellation_type::terminal
| cancellation_type::partial
| cancellation_type::total)))
{
HANDLE sock_as_handle = reinterpret_cast<HANDLE>(socket_);
::CancelIoEx(sock_as_handle, this);
}
#else // defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600)
(void)type;
#endif // defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600)
}
private:
SOCKET socket_;
operation* target_;
};
// Helper class used to implement per operation cancellation.
class accept_op_cancellation : public operation
{
public:
accept_op_cancellation(SOCKET s, operation* target)
: operation(&iocp_op_cancellation::do_complete),
socket_(s),
target_(target),
cancel_requested_(0)
{
}
static void do_complete(void* owner, operation* base,
const asio::error_code& result_ec,
std::size_t bytes_transferred)
{
accept_op_cancellation* o = static_cast<accept_op_cancellation*>(base);
o->target_->complete(owner, result_ec, bytes_transferred);
}
long* get_cancel_requested()
{
return &cancel_requested_;
}
void operator()(cancellation_type_t type)
{
#if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600)
if (!!(type &
(cancellation_type::terminal
| cancellation_type::partial
| cancellation_type::total)))
{
HANDLE sock_as_handle = reinterpret_cast<HANDLE>(socket_);
::CancelIoEx(sock_as_handle, this);
}
#else // defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600)
(void)type;
#endif // defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600)
}
private:
SOCKET socket_;
operation* target_;
long cancel_requested_;
};
// Helper class used to implement per operation cancellation.
class reactor_op_cancellation : public operation
{
public:
reactor_op_cancellation(SOCKET s, operation* base)
: operation(&reactor_op_cancellation::do_complete),
socket_(s),
target_(base),
reactor_(0),
reactor_data_(0),
op_type_(-1)
{
}
void use_reactor(select_reactor* r,
select_reactor::per_descriptor_data* p, int o)
{
reactor_ = r;
reactor_data_ = p;
op_type_ = o;
}
static void do_complete(void* owner, operation* base,
const asio::error_code& result_ec,
std::size_t bytes_transferred)
{
reactor_op_cancellation* o = static_cast<reactor_op_cancellation*>(base);
o->target_->complete(owner, result_ec, bytes_transferred);
}
void operator()(cancellation_type_t type)
{
if (!!(type &
(cancellation_type::terminal
| cancellation_type::partial
| cancellation_type::total)))
{
if (reactor_)
{
reactor_->cancel_ops_by_key(socket_,
*reactor_data_, op_type_, this);
}
else
{
#if defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600)
HANDLE sock_as_handle = reinterpret_cast<HANDLE>(socket_);
::CancelIoEx(sock_as_handle, this);
#endif // defined(_WIN32_WINNT) && (_WIN32_WINNT >= 0x0600)
}
}
}
private:
SOCKET socket_;
operation* target_;
select_reactor* reactor_;
select_reactor::per_descriptor_data* reactor_data_;
int op_type_;
};
// The execution context used to obtain the reactor, if required.
execution_context& context_;
// The IOCP service used for running asynchronous operations and dispatching
// handlers.
win_iocp_io_context& iocp_service_;
// The reactor used for performing connect operations. This object is created
// only if needed.
select_reactor* reactor_;
// Pointer to ConnectEx implementation.
void* connect_ex_;
// Pointer to NtSetInformationFile implementation.
void* nt_set_info_;
// Mutex to protect access to the linked list of implementations.
asio::detail::mutex mutex_;
// The head of a linked list of all implementations.
base_implementation_type* impl_list_;
};
} // namespace detail
} // namespace asio
#include "asio/detail/pop_options.hpp"
#if defined(ASIO_HEADER_ONLY)
# include "asio/detail/impl/win_iocp_socket_service_base.ipp"
#endif // defined(ASIO_HEADER_ONLY)
#endif // defined(ASIO_HAS_IOCP)
#endif // ASIO_DETAIL_WIN_IOCP_SOCKET_SERVICE_BASE_HPP
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