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89 lines
2.4 KiB
C++
89 lines
2.4 KiB
C++
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/* Copyright (C) 2007 MySQL AB
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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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/*
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Implementation for the thread scheduler
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*/
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#ifdef USE_PRAGMA_INTERFACE
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#pragma implementation
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#endif
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#include <mysql_priv.h>
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/*
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'Dummy' functions to be used when we don't need any handling for a scheduler
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event
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*/
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static bool init_dummy(void) {return 0;}
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static void post_kill_dummy(THD* thd) {}
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static void end_dummy(void) {}
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static bool end_thread_dummy(THD *thd, bool cache_thread) { return 0; }
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/*
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Initialize default scheduler with dummy functions so that setup functions
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only need to declare those that are relvant for their usage
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*/
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scheduler_functions::scheduler_functions()
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:init(init_dummy),
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init_new_connection_thread(init_new_connection_handler_thread),
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add_connection(0), // Must be defined
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post_kill_notification(post_kill_dummy),
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end_thread(end_thread_dummy), end(end_dummy)
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{}
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/*
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End connection, in case when we are using 'no-threads'
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*/
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static bool no_threads_end(THD *thd, bool put_in_cache)
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{
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unlink_thd(thd);
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pthread_mutex_unlock(&LOCK_thread_count);
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return 1; // Abort handle_one_connection
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}
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/*
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Initailize scheduler for --thread-handling=no-threads
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*/
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void one_thread_scheduler(scheduler_functions* func)
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{
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func->max_threads= 1;
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#ifndef EMBEDDED_LIBRARY
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func->add_connection= handle_connection_in_main_thread;
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#endif
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func->init_new_connection_thread= init_dummy;
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func->end_thread= no_threads_end;
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}
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/*
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Initialize scheduler for --thread-handling=one-thread-per-connection
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*/
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#ifndef EMBEDDED_LIBRARY
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void one_thread_per_connection_scheduler(scheduler_functions* func)
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{
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func->max_threads= max_connections;
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func->add_connection= create_thread_to_handle_connection;
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func->end_thread= one_thread_per_connection_end;
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}
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#endif /* EMBEDDED_LIBRARY */
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