git.m6w6.name Git - m6w6/libmemcached/blob - libmemcached/io.h

   1 /*  vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
   2  *
   3  *  LibMemcached
   4  *
   5  *  Copyright (C) 2011 Data Differential, http://datadifferential.com/
   6  *  Copyright (C) 2006-2009 Brian Aker
   7  *  All rights reserved.
   8  *
   9  *  Redistribution and use in source and binary forms, with or without
  10  *  modification, are permitted provided that the following conditions are
  11  *  met:
  12  *
  13  *      * Redistributions of source code must retain the above copyright
  14  *  notice, this list of conditions and the following disclaimer.
  15  *
  16  *      * Redistributions in binary form must reproduce the above
  17  *  copyright notice, this list of conditions and the following disclaimer
  18  *  in the documentation and/or other materials provided with the
  19  *  distribution.
  20  *
  21  *      * The names of its contributors may not be used to endorse or
  22  *  promote products derived from this software without specific prior
  23  *  written permission.
  24  *
  25  *  THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
  26  *  "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
  27  *  LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
  28  *  A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
  29  *  OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
  30  *  SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
  31  *  LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
  32  *  DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
  33  *  THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
  34  *  (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
  35  *  OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
  36  *
  37  */
  38
  39 #pragma once
  40
  41 #define MAX_UDP_DATAGRAM_LENGTH 1400
  42 #define UDP_DATAGRAM_HEADER_LENGTH 8
  43 #define UDP_REQUEST_ID_MSG_SIG_DIGITS 10
  44 #define UDP_REQUEST_ID_THREAD_MASK 0xFFFF << UDP_REQUEST_ID_MSG_SIG_DIGITS
  45 #define get_udp_datagram_request_id(A) ntohs((A)->request_id)
  46 #define get_udp_datagram_seq_num(A) ntohs((A)->sequence_number)
  47 #define get_udp_datagram_num_datagrams(A) ntohs((A)->num_datagrams)
  48 #define get_msg_num_from_request_id(A) ( (A) & (~(UDP_REQUEST_ID_THREAD_MASK)) )
  49 #define get_thread_id_from_request_id(A) ( (A) & (UDP_REQUEST_ID_THREAD_MASK) ) >> UDP_REQUEST_ID_MSG_SIG_DIGITS
  50 #define generate_udp_request_thread_id(A) (A) << UDP_REQUEST_ID_MSG_SIG_DIGITS
  51 #define UDP_REQUEST_ID_MAX_THREAD_ID get_thread_id_from_request_id(0xFFFF)
  52
  53 struct udp_datagram_header_st
  54 {
  55   uint16_t request_id;
  56   uint16_t sequence_number;
  57   uint16_t num_datagrams;
  58   uint16_t reserved;
  59 };
  60
  61 struct libmemcached_io_vector_st
  62 {
  63   size_t length;
  64   const void *buffer;
  65 };
  66
  67 #ifdef __cplusplus
  68 extern "C" {
  69 #endif
  70
  71 LIBMEMCACHED_LOCAL
  72 ssize_t memcached_io_write(memcached_server_write_instance_st ptr,
  73                            const void *buffer, size_t length, bool with_flush);
  74
  75 LIBMEMCACHED_LOCAL
  76 ssize_t memcached_io_writev(memcached_server_write_instance_st ptr,
  77                             const struct libmemcached_io_vector_st *vector,
  78                             size_t number_of, bool with_flush);
  79
  80 #ifdef __cplusplus
  81 }
  82 #endif