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/* Copyright (C) 2007 Google Inc.
Copyright (C) 2008 MySQL AB
Use is subject to license terms
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 02110-1301 USA */
#ifndef SEMISYNC_H
#define SEMISYNC_H
#define MYSQL_SERVER
#define HAVE_REPLICATION
#include <my_pthread.h>
#include <sql_priv.h>
#include <sql_class.h>
#include "unireg.h"
#include <replication.h>
#include "log.h" /* sql_print_information */
typedef struct st_mysql_show_var SHOW_VAR;
typedef struct st_mysql_sys_var SYS_VAR;
/**
This class is used to trace function calls and other process
information
*/
class Trace {
public:
static const unsigned long kTraceFunction;
static const unsigned long kTraceGeneral;
static const unsigned long kTraceDetail;
static const unsigned long kTraceNetWait;
unsigned long trace_level_; /* the level for tracing */
inline void function_enter(const char *func_name)
{
if (trace_level_ & kTraceFunction)
sql_print_information("---> %s enter", func_name);
}
inline int function_exit(const char *func_name, int exit_code)
{
if (trace_level_ & kTraceFunction)
sql_print_information("<--- %s exit (%d)", func_name, exit_code);
return exit_code;
}
Trace()
:trace_level_(0L)
{}
Trace(unsigned long trace_level)
:trace_level_(trace_level)
{}
};
/**
Base class for semi-sync master and slave classes
*/
class ReplSemiSyncBase
:public Trace {
public:
static const unsigned char kSyncHeader[2]; /* three byte packet header */
/* Constants in network packet header. */
static const unsigned char kPacketMagicNum;
static const unsigned char kPacketFlagSync;
};
/* 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)
#endif /* SEMISYNC_H */
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