122 lines
4.0 KiB
C++
122 lines
4.0 KiB
C++
/*
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Copyright (c) 2013, 2018, 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, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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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, version 2.0, 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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*/
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#ifndef CONNECTION_HANDLER_IMPL_INCLUDED
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#define CONNECTION_HANDLER_IMPL_INCLUDED
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#include <list>
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#include "mysql/psi/mysql_cond.h" // mysql_cond_t
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#include "mysql/psi/mysql_mutex.h" // mysql_mutex_t
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#include "sql/conn_handler/connection_handler.h" // Connection_handler
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class Channel_info;
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class THD;
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/**
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This class represents the connection handling functionality
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that each connection is being handled in a single thread
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*/
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class Per_thread_connection_handler : public Connection_handler {
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Per_thread_connection_handler(const Per_thread_connection_handler &);
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Per_thread_connection_handler &operator=(
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const Per_thread_connection_handler &);
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/**
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Check if idle threads to handle connection in
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thread cache. If so enqueue the new connection
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to be picked by the idle thread in thread cache.
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@retval false if idle pthread was found, else true.
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*/
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bool check_idle_thread_and_enqueue_connection(Channel_info *channel_info);
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/**
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List of pending channel info objects to be picked by idle
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threads. Protected by LOCK_thread_cache.
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*/
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static std::list<Channel_info *> *waiting_channel_info_list;
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static mysql_mutex_t LOCK_thread_cache;
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static mysql_cond_t COND_thread_cache;
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static mysql_cond_t COND_flush_thread_cache;
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public:
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// Status variables related to Per_thread_connection_handler
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static ulong blocked_pthread_count; // Protected by LOCK_thread_cache.
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static ulong slow_launch_threads;
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static bool shrink_cache; // Protected by LOCK_thread_cache
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// System variable
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static ulong max_blocked_pthreads;
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static void init();
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static void destroy();
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/**
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Wake blocked pthreads and wait until they have terminated.
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*/
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static void kill_blocked_pthreads();
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/**
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Block until a new connection arrives.
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*/
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static Channel_info *block_until_new_connection();
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/**
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Modify the thread cache size.
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@param thread_cache_size size of thread cache.
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*/
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static void modify_thread_cache_size(const ulong thread_cache_size);
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Per_thread_connection_handler() {}
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virtual ~Per_thread_connection_handler() {}
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protected:
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virtual bool add_connection(Channel_info *channel_info);
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virtual uint get_max_threads() const;
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};
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/**
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This class represents the connection handling functionality
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of all connections being handled in a single worker thread.
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*/
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class One_thread_connection_handler : public Connection_handler {
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One_thread_connection_handler(const One_thread_connection_handler &);
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One_thread_connection_handler &operator=(
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const One_thread_connection_handler &);
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public:
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One_thread_connection_handler() {}
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virtual ~One_thread_connection_handler() {}
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protected:
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virtual bool add_connection(Channel_info *channel_info);
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virtual uint get_max_threads() const { return 1; }
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};
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#endif // CONNECTION_HANDLER_IMPL_INCLUDED
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