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diff --git a/plugin/semisync/semisync_slave.h b/plugin/semisync/semisync_slave.h
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+++ b/plugin/semisync/semisync_slave.h
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+/* Copyright (C) 2006 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  02110-1301  USA */
+
+
+#ifndef SEMISYNC_SLAVE_H
+#define SEMISYNC_SLAVE_H
+
+#include "semisync.h"
+
+/**
+   The extension class for the slave of semi-synchronous replication
+*/
+class ReplSemiSyncSlave
+  :public ReplSemiSyncBase {
+public:
+ ReplSemiSyncSlave()
+   :slave_enabled_(false)
+  {}
+  ~ReplSemiSyncSlave() {}
+
+  void setTraceLevel(unsigned long trace_level) {
+    trace_level_ = trace_level;
+  }
+
+  /* Initialize this class after MySQL parameters are initialized. this
+   * function should be called once at bootstrap time.
+   */
+  int initObject();
+
+  bool getSlaveEnabled() {
+    return slave_enabled_;
+  }
+  void setSlaveEnabled(bool enabled) {
+    slave_enabled_ = enabled;
+  }
+
+  /* A slave reads the semi-sync packet header and separate the metadata
+   * from the payload data.
+   * 
+   * Input:
+   *  header      - (IN)  packet header pointer
+   *  total_len   - (IN)  total packet length: metadata + payload
+   *  need_reply  - (IN)  whether the master is waiting for the reply
+   *  payload     - (IN)  payload: the replication event
+   *  payload_len - (IN)  payload length
+   *
+   * Return:
+   *  0: success;  non-zero: error
+   */
+  int slaveReadSyncHeader(const char *header, unsigned long total_len, bool *need_reply,
+                          const char **payload, unsigned long *payload_len);
+
+  /* A slave replies to the master indicating its replication process.  It
+   * indicates that the slave has received all events before the specified
+   * binlog position.
+   * 
+   * Input:
+   *  mysql            - (IN)  the mysql network connection
+   *  binlog_filename  - (IN)  the reply point's binlog file name
+   *  binlog_filepos   - (IN)  the reply point's binlog file offset
+   *
+   * Return:
+   *  0: success;  non-zero: error
+   */
+  int slaveReply(MYSQL *mysql, const char *binlog_filename,
+                 my_off_t binlog_filepos);
+
+  int slaveStart(Binlog_relay_IO_param *param);
+  int slaveStop(Binlog_relay_IO_param *param);
+
+private:
+  /* True when initObject has been called */
+  bool init_done_;
+  bool slave_enabled_;        /* semi-sycn is enabled on the slave */
+  MYSQL *mysql_reply;         /* connection to send reply */
+};
+
+
+/* System and status variables for the slave component */
+extern char rpl_semi_sync_slave_enabled;
+extern unsigned long rpl_semi_sync_slave_trace_level;
+extern char rpl_semi_sync_slave_status;
+
+#endif /* SEMISYNC_SLAVE_H */