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+/* 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 */