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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/win_iocp_handle_service.ipp
parent558d74bffd9f069955af52c0b308a1d6169bcff0 (diff)
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Merge lime output into next branch
Diffstat (limited to 'lib/asio/detail/impl/win_iocp_handle_service.ipp')
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-//
-// detail/impl/win_iocp_handle_service.ipp
-// ~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
-//
-// Copyright (c) 2003-2018 Christopher M. Kohlhoff (chris at kohlhoff dot com)
-// Copyright (c) 2008 Rep Invariant Systems, Inc. (info@repinvariant.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_WIN_IOCP_HANDLE_SERVICE_IPP
-#define ASIO_DETAIL_IMPL_WIN_IOCP_HANDLE_SERVICE_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)
-
-#include "asio/detail/win_iocp_handle_service.hpp"
-
-#include "asio/detail/push_options.hpp"
-
-namespace asio {
-namespace detail {
-
-class win_iocp_handle_service::overlapped_wrapper
- : public OVERLAPPED
-{
-public:
- explicit overlapped_wrapper(asio::error_code& ec)
- {
- Internal = 0;
- InternalHigh = 0;
- Offset = 0;
- OffsetHigh = 0;
-
- // Create a non-signalled manual-reset event, for GetOverlappedResult.
- hEvent = ::CreateEventW(0, TRUE, FALSE, 0);
- if (hEvent)
- {
- // As documented in GetQueuedCompletionStatus, setting the low order
- // bit of this event prevents our synchronous writes from being treated
- // as completion port events.
- DWORD_PTR tmp = reinterpret_cast<DWORD_PTR>(hEvent);
- hEvent = reinterpret_cast<HANDLE>(tmp | 1);
- }
- else
- {
- DWORD last_error = ::GetLastError();
- ec = asio::error_code(last_error,
- asio::error::get_system_category());
- }
- }
-
- ~overlapped_wrapper()
- {
- if (hEvent)
- {
- ::CloseHandle(hEvent);
- }
- }
-};
-
-win_iocp_handle_service::win_iocp_handle_service(
- asio::io_context& io_context)
- : service_base<win_iocp_handle_service>(io_context),
- iocp_service_(asio::use_service<win_iocp_io_context>(io_context)),
- mutex_(),
- impl_list_(0)
-{
-}
-
-void win_iocp_handle_service::shutdown()
-{
- // Close all implementations, causing all operations to complete.
- asio::detail::mutex::scoped_lock lock(mutex_);
- implementation_type* impl = impl_list_;
- while (impl)
- {
- close_for_destruction(*impl);
- impl = impl->next_;
- }
-}
-
-void win_iocp_handle_service::construct(
- win_iocp_handle_service::implementation_type& impl)
-{
- impl.handle_ = INVALID_HANDLE_VALUE;
- impl.safe_cancellation_thread_id_ = 0;
-
- // Insert implementation into linked list of all implementations.
- asio::detail::mutex::scoped_lock lock(mutex_);
- impl.next_ = impl_list_;
- impl.prev_ = 0;
- if (impl_list_)
- impl_list_->prev_ = &impl;
- impl_list_ = &impl;
-}
-
-void win_iocp_handle_service::move_construct(
- win_iocp_handle_service::implementation_type& impl,
- win_iocp_handle_service::implementation_type& other_impl)
-{
- impl.handle_ = other_impl.handle_;
- other_impl.handle_ = INVALID_HANDLE_VALUE;
-
- impl.safe_cancellation_thread_id_ = other_impl.safe_cancellation_thread_id_;
- other_impl.safe_cancellation_thread_id_ = 0;
-
- // Insert implementation into linked list of all implementations.
- asio::detail::mutex::scoped_lock lock(mutex_);
- impl.next_ = impl_list_;
- impl.prev_ = 0;
- if (impl_list_)
- impl_list_->prev_ = &impl;
- impl_list_ = &impl;
-}
-
-void win_iocp_handle_service::move_assign(
- win_iocp_handle_service::implementation_type& impl,
- win_iocp_handle_service& other_service,
- win_iocp_handle_service::implementation_type& other_impl)
-{
- close_for_destruction(impl);
-
- if (this != &other_service)
- {
- // Remove implementation from linked list of all implementations.
- asio::detail::mutex::scoped_lock lock(mutex_);
- if (impl_list_ == &impl)
- impl_list_ = impl.next_;
- if (impl.prev_)
- impl.prev_->next_ = impl.next_;
- if (impl.next_)
- impl.next_->prev_= impl.prev_;
- impl.next_ = 0;
- impl.prev_ = 0;
- }
-
- impl.handle_ = other_impl.handle_;
- other_impl.handle_ = INVALID_HANDLE_VALUE;
-
- impl.safe_cancellation_thread_id_ = other_impl.safe_cancellation_thread_id_;
- other_impl.safe_cancellation_thread_id_ = 0;
-
- if (this != &other_service)
- {
- // Insert implementation into linked list of all implementations.
- asio::detail::mutex::scoped_lock lock(other_service.mutex_);
- impl.next_ = other_service.impl_list_;
- impl.prev_ = 0;
- if (other_service.impl_list_)
- other_service.impl_list_->prev_ = &impl;
- other_service.impl_list_ = &impl;
- }
-}
-
-void win_iocp_handle_service::destroy(
- win_iocp_handle_service::implementation_type& impl)
-{
- close_for_destruction(impl);
-
- // Remove implementation from linked list of all implementations.
- asio::detail::mutex::scoped_lock lock(mutex_);
- if (impl_list_ == &impl)
- impl_list_ = impl.next_;
- if (impl.prev_)
- impl.prev_->next_ = impl.next_;
- if (impl.next_)
- impl.next_->prev_= impl.prev_;
- impl.next_ = 0;
- impl.prev_ = 0;
-}
-
-asio::error_code win_iocp_handle_service::assign(
- win_iocp_handle_service::implementation_type& impl,
- const native_handle_type& handle, asio::error_code& ec)
-{
- if (is_open(impl))
- {
- ec = asio::error::already_open;
- return ec;
- }
-
- if (iocp_service_.register_handle(handle, ec))
- return ec;
-
- impl.handle_ = handle;
- ec = asio::error_code();
- return ec;
-}
-
-asio::error_code win_iocp_handle_service::close(
- win_iocp_handle_service::implementation_type& impl,
- asio::error_code& ec)
-{
- if (is_open(impl))
- {
- ASIO_HANDLER_OPERATION((iocp_service_.context(), "handle",
- &impl, reinterpret_cast<uintmax_t>(impl.handle_), "close"));
-
- if (!::CloseHandle(impl.handle_))
- {
- DWORD last_error = ::GetLastError();
- ec = asio::error_code(last_error,
- asio::error::get_system_category());
- }
- else
- {
- ec = asio::error_code();
- }
-
- impl.handle_ = INVALID_HANDLE_VALUE;
- impl.safe_cancellation_thread_id_ = 0;
- }
- else
- {
- ec = asio::error_code();
- }
-
- return ec;
-}
-
-asio::error_code win_iocp_handle_service::cancel(
- win_iocp_handle_service::implementation_type& impl,
- asio::error_code& ec)
-{
- if (!is_open(impl))
- {
- ec = asio::error::bad_descriptor;
- return ec;
- }
-
- ASIO_HANDLER_OPERATION((iocp_service_.context(), "handle",
- &impl, reinterpret_cast<uintmax_t>(impl.handle_), "cancel"));
-
- if (FARPROC cancel_io_ex_ptr = ::GetProcAddress(
- ::GetModuleHandleA("KERNEL32"), "CancelIoEx"))
- {
- // The version of Windows supports cancellation from any thread.
- typedef BOOL (WINAPI* cancel_io_ex_t)(HANDLE, LPOVERLAPPED);
- cancel_io_ex_t cancel_io_ex = (cancel_io_ex_t)cancel_io_ex_ptr;
- if (!cancel_io_ex(impl.handle_, 0))
- {
- DWORD last_error = ::GetLastError();
- if (last_error == ERROR_NOT_FOUND)
- {
- // ERROR_NOT_FOUND means that there were no operations to be
- // cancelled. We swallow this error to match the behaviour on other
- // platforms.
- ec = asio::error_code();
- }
- else
- {
- ec = asio::error_code(last_error,
- asio::error::get_system_category());
- }
- }
- else
- {
- ec = asio::error_code();
- }
- }
- else if (impl.safe_cancellation_thread_id_ == 0)
- {
- // No operations have been started, so there's nothing to cancel.
- ec = asio::error_code();
- }
- else if (impl.safe_cancellation_thread_id_ == ::GetCurrentThreadId())
- {
- // Asynchronous operations have been started from the current thread only,
- // so it is safe to try to cancel them using CancelIo.
- if (!::CancelIo(impl.handle_))
- {
- DWORD last_error = ::GetLastError();
- ec = asio::error_code(last_error,
- asio::error::get_system_category());
- }
- else
- {
- ec = asio::error_code();
- }
- }
- else
- {
- // Asynchronous operations have been started from more than one thread,
- // so cancellation is not safe.
- ec = asio::error::operation_not_supported;
- }
-
- return ec;
-}
-
-size_t win_iocp_handle_service::do_write(
- win_iocp_handle_service::implementation_type& impl, uint64_t offset,
- const asio::const_buffer& buffer, asio::error_code& ec)
-{
- if (!is_open(impl))
- {
- ec = asio::error::bad_descriptor;
- return 0;
- }
-
- // A request to write 0 bytes on a handle is a no-op.
- if (buffer.size() == 0)
- {
- ec = asio::error_code();
- return 0;
- }
-
- overlapped_wrapper overlapped(ec);
- if (ec)
- {
- return 0;
- }
-
- // Write the data.
- overlapped.Offset = offset & 0xFFFFFFFF;
- overlapped.OffsetHigh = (offset >> 32) & 0xFFFFFFFF;
- BOOL ok = ::WriteFile(impl.handle_, buffer.data(),
- static_cast<DWORD>(buffer.size()), 0, &overlapped);
- if (!ok)
- {
- DWORD last_error = ::GetLastError();
- if (last_error != ERROR_IO_PENDING)
- {
- ec = asio::error_code(last_error,
- asio::error::get_system_category());
- return 0;
- }
- }
-
- // Wait for the operation to complete.
- DWORD bytes_transferred = 0;
- ok = ::GetOverlappedResult(impl.handle_,
- &overlapped, &bytes_transferred, TRUE);
- if (!ok)
- {
- DWORD last_error = ::GetLastError();
- ec = asio::error_code(last_error,
- asio::error::get_system_category());
- return 0;
- }
-
- ec = asio::error_code();
- return bytes_transferred;
-}
-
-void win_iocp_handle_service::start_write_op(
- win_iocp_handle_service::implementation_type& impl, uint64_t offset,
- const asio::const_buffer& buffer, operation* op)
-{
- update_cancellation_thread_id(impl);
- iocp_service_.work_started();
-
- if (!is_open(impl))
- {
- iocp_service_.on_completion(op, asio::error::bad_descriptor);
- }
- else if (buffer.size() == 0)
- {
- // A request to write 0 bytes on a handle is a no-op.
- iocp_service_.on_completion(op);
- }
- else
- {
- DWORD bytes_transferred = 0;
- op->Offset = offset & 0xFFFFFFFF;
- op->OffsetHigh = (offset >> 32) & 0xFFFFFFFF;
- BOOL ok = ::WriteFile(impl.handle_, buffer.data(),
- static_cast<DWORD>(buffer.size()),
- &bytes_transferred, op);
- DWORD last_error = ::GetLastError();
- if (!ok && last_error != ERROR_IO_PENDING
- && last_error != ERROR_MORE_DATA)
- {
- iocp_service_.on_completion(op, last_error, bytes_transferred);
- }
- else
- {
- iocp_service_.on_pending(op);
- }
- }
-}
-
-size_t win_iocp_handle_service::do_read(
- win_iocp_handle_service::implementation_type& impl, uint64_t offset,
- const asio::mutable_buffer& buffer, asio::error_code& ec)
-{
- if (!is_open(impl))
- {
- ec = asio::error::bad_descriptor;
- return 0;
- }
-
- // A request to read 0 bytes on a stream handle is a no-op.
- if (buffer.size() == 0)
- {
- ec = asio::error_code();
- return 0;
- }
-
- overlapped_wrapper overlapped(ec);
- if (ec)
- {
- return 0;
- }
-
- // Read some data.
- overlapped.Offset = offset & 0xFFFFFFFF;
- overlapped.OffsetHigh = (offset >> 32) & 0xFFFFFFFF;
- BOOL ok = ::ReadFile(impl.handle_, buffer.data(),
- static_cast<DWORD>(buffer.size()), 0, &overlapped);
- if (!ok)
- {
- DWORD last_error = ::GetLastError();
- if (last_error != ERROR_IO_PENDING && last_error != ERROR_MORE_DATA)
- {
- if (last_error == ERROR_HANDLE_EOF)
- {
- ec = asio::error::eof;
- }
- else
- {
- ec = asio::error_code(last_error,
- asio::error::get_system_category());
- }
- return 0;
- }
- }
-
- // Wait for the operation to complete.
- DWORD bytes_transferred = 0;
- ok = ::GetOverlappedResult(impl.handle_,
- &overlapped, &bytes_transferred, TRUE);
- if (!ok)
- {
- DWORD last_error = ::GetLastError();
- if (last_error == ERROR_HANDLE_EOF)
- {
- ec = asio::error::eof;
- }
- else
- {
- ec = asio::error_code(last_error,
- asio::error::get_system_category());
- }
- return (last_error == ERROR_MORE_DATA) ? bytes_transferred : 0;
- }
-
- ec = asio::error_code();
- return bytes_transferred;
-}
-
-void win_iocp_handle_service::start_read_op(
- win_iocp_handle_service::implementation_type& impl, uint64_t offset,
- const asio::mutable_buffer& buffer, operation* op)
-{
- update_cancellation_thread_id(impl);
- iocp_service_.work_started();
-
- if (!is_open(impl))
- {
- iocp_service_.on_completion(op, asio::error::bad_descriptor);
- }
- else if (buffer.size() == 0)
- {
- // A request to read 0 bytes on a handle is a no-op.
- iocp_service_.on_completion(op);
- }
- else
- {
- DWORD bytes_transferred = 0;
- op->Offset = offset & 0xFFFFFFFF;
- op->OffsetHigh = (offset >> 32) & 0xFFFFFFFF;
- BOOL ok = ::ReadFile(impl.handle_, buffer.data(),
- static_cast<DWORD>(buffer.size()),
- &bytes_transferred, op);
- DWORD last_error = ::GetLastError();
- if (!ok && last_error != ERROR_IO_PENDING
- && last_error != ERROR_MORE_DATA)
- {
- iocp_service_.on_completion(op, last_error, bytes_transferred);
- }
- else
- {
- iocp_service_.on_pending(op);
- }
- }
-}
-
-void win_iocp_handle_service::update_cancellation_thread_id(
- win_iocp_handle_service::implementation_type& impl)
-{
- if (impl.safe_cancellation_thread_id_ == 0)
- impl.safe_cancellation_thread_id_ = ::GetCurrentThreadId();
- else if (impl.safe_cancellation_thread_id_ != ::GetCurrentThreadId())
- impl.safe_cancellation_thread_id_ = ~DWORD(0);
-}
-
-void win_iocp_handle_service::close_for_destruction(implementation_type& impl)
-{
- if (is_open(impl))
- {
- ASIO_HANDLER_OPERATION((iocp_service_.context(), "handle",
- &impl, reinterpret_cast<uintmax_t>(impl.handle_), "close"));
-
- ::CloseHandle(impl.handle_);
- impl.handle_ = INVALID_HANDLE_VALUE;
- impl.safe_cancellation_thread_id_ = 0;
- }
-}
-
-} // namespace detail
-} // namespace asio
-
-#include "asio/detail/pop_options.hpp"
-
-#endif // defined(ASIO_HAS_IOCP)
-
-#endif // ASIO_DETAIL_IMPL_WIN_IOCP_HANDLE_SERVICE_IPP