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mysql
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Filename :
threadpool_winsockets.h
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/* Copyright (C) 2020 Monty Program Ab This program is free software; you can redistribute it and/or modify it under the terms of the GNU General Public License as published by the Free Software Foundation; version 2 of the License. This program is distributed in the hope that it will be useful, but WITHOUT ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details. You should have received a copy of the GNU General Public License along with this program; if not, write to the Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1335 USA */ #pragma once #include <WinSock2.h> #include <windows.h> struct st_vio; struct win_aiosocket { /** OVERLAPPED is needed by all Windows AIO*/ OVERLAPPED m_overlapped{}; /** Handle to pipe, or socket */ HANDLE m_handle{}; /** Whether the m_handle refers to pipe*/ bool m_is_pipe{}; /* Read buffer handling */ /** Pointer to buffer of size READ_BUFSIZ. Can be NULL.*/ char *m_buf_ptr{}; /** Offset to current buffer position*/ size_t m_buf_off{}; /** Size of valid data in the buffer*/ size_t m_buf_datalen{}; /* Vio handling */ /** Pointer to original vio->vio_read/vio->has_data function */ size_t (*m_orig_vio_read)(st_vio *, unsigned char *, size_t){}; char (*m_orig_vio_has_data)(st_vio *){}; /** Begins asynchronnous reading from socket/pipe. On IO completion, pre-read some bytes into internal buffer */ DWORD begin_read(); /** Update number of bytes returned, and IO error status Should be called right after IO is completed GetQueuedCompletionStatus() , or threadpool IO completion callback would return nbytes and the error. Sets the valid data length in the read buffer. */ void end_read(ULONG nbytes, DWORD err); /** Override VIO routines with ours, accounting for one-shot buffering. */ void init(st_vio *vio); /** Return number of unread bytes.*/ size_t buffer_remaining(); /* Frees the read buffer.*/ ~win_aiosocket(); }; /* Functions related to IO buffers caches.*/ extern void init_win_aio_buffers(unsigned int n_buffers); extern void destroy_win_aio_buffers();