Current File : //proc/thread-self/root/usr/include/mysql/server/private/semisync.h
/* Copyright (C) 2007 Google Inc.
Copyright (C) 2008 MySQL 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 St, Fifth Floor, Boston, MA 02110-1335 USA */
#ifndef SEMISYNC_H
#define SEMISYNC_H
#include "mysqld.h"
#include "log_event.h"
#include "replication.h"
/**
This class is used to trace function calls and other process
information
*/
class Trace {
public:
static const unsigned long k_trace_function;
static const unsigned long k_trace_general;
static const unsigned long k_trace_detail;
static const unsigned long k_trace_net_wait;
unsigned long m_trace_level; /* the level for tracing */
Trace()
:m_trace_level(0L)
{}
Trace(unsigned long trace_level)
:m_trace_level(trace_level)
{}
};
/**
Base class for semi-sync master and slave classes
*/
class Repl_semi_sync_base
:public Trace {
public:
static const unsigned char k_sync_header[2]; /* three byte packet header */
/* Constants in network packet header. */
static const unsigned char k_packet_magic_num;
static const unsigned char k_packet_flag_sync;
};
/* The layout of a semisync slave reply packet:
1 byte for the magic num
8 bytes for the binlog positon
n bytes for the binlog filename, terminated with a '\0'
*/
#define REPLY_MAGIC_NUM_LEN 1
#define REPLY_BINLOG_POS_LEN 8
#define REPLY_BINLOG_NAME_LEN (FN_REFLEN + 1)
#define REPLY_MAGIC_NUM_OFFSET 0
#define REPLY_BINLOG_POS_OFFSET (REPLY_MAGIC_NUM_OFFSET + REPLY_MAGIC_NUM_LEN)
#define REPLY_BINLOG_NAME_OFFSET (REPLY_BINLOG_POS_OFFSET + REPLY_BINLOG_POS_LEN)
#define REPLY_MESSAGE_MAX_LENGTH \
(REPLY_MAGIC_NUM_LEN + REPLY_BINLOG_POS_LEN + REPLY_BINLOG_NAME_LEN)
#endif /* SEMISYNC_H */
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