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119 lines
3.2 KiB
C++
119 lines
3.2 KiB
C++
/* Copyright (c) 2014, Oracle and/or its affiliates. All rights reserved.
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef SEMISYNC_MASTER_ACK_RECEIVER_DEFINED
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#define SEMISYNC_MASTER_ACK_RECEIVER_DEFINED
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#include "my_global.h"
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#include "my_pthread.h"
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#include "sql_class.h"
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#include "semisync.h"
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/**
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Ack_receiver is responsible to control ack receive thread and maintain
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slave information used by ack receive thread.
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There are mainly four operations on ack receive thread:
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start: start ack receive thread
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stop: stop ack receive thread
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add_slave: maintain a new semisync slave's information
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remove_slave: remove a semisync slave's information
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*/
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class Ack_receiver : public Repl_semi_sync_base
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{
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public:
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Ack_receiver();
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~Ack_receiver() {}
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void cleanup();
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/**
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Notify ack receiver to receive acks on the dump session.
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It adds the given dump thread into the slave list and wakes
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up ack thread if it is waiting for any slave coming.
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@param[in] thd THD of a dump thread.
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@return it return false if succeeds, otherwise true is returned.
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*/
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bool add_slave(THD *thd);
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/**
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Notify ack receiver not to receive ack on the dump session.
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it removes the given dump thread from slave list.
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@param[in] thd THD of a dump thread.
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*/
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void remove_slave(THD *thd);
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/**
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Start ack receive thread
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@return it return false if succeeds, otherwise true is returned.
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*/
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bool start();
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/**
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Stop ack receive thread
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*/
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void stop();
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/**
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The core of ack receive thread.
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It monitors all slaves' sockets and receives acks when they come.
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*/
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void run();
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void set_trace_level(unsigned long trace_level)
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{
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m_trace_level= trace_level;
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}
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private:
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enum status {ST_UP, ST_DOWN, ST_STOPPING};
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uint8 m_status;
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/*
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Protect m_status, m_slaves_changed and m_slaves. ack thread and other
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session may access the variables at the same time.
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*/
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mysql_mutex_t m_mutex;
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mysql_cond_t m_cond;
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/* If slave list is updated(add or remove). */
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bool m_slaves_changed;
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class Slave :public ilink
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{
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public:
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THD *thd;
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Vio vio;
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my_socket sock_fd() { return vio.mysql_socket.fd; }
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uint server_id() { return thd->variables.server_id; }
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};
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I_List<Slave> m_slaves;
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pthread_t m_pid;
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/* Declare them private, so no one can copy the object. */
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Ack_receiver(const Ack_receiver &ack_receiver);
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Ack_receiver& operator=(const Ack_receiver &ack_receiver);
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void set_stage_info(const PSI_stage_info &stage);
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void wait_for_slave_connection();
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my_socket get_slave_sockets(fd_set *fds, uint *count);
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};
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extern Ack_receiver ack_receiver;
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#endif
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