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153 lines
4 KiB
C++
153 lines
4 KiB
C++
/* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
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Copyright (c) 2012, 2013, Monty Program 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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 "sql_connect.h" // init_new_connection_handler_thread
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#include "scheduler.h"
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#include "mysqld.h"
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#include "sql_class.h"
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#include "sql_callback.h"
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#include <violite.h>
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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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return 1; // Abort handle_one_connection
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}
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/** @internal
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Helper functions to allow mysys to call the thread scheduler when
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waiting for locks.
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*/
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/**@{*/
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extern "C"
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{
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static void scheduler_wait_lock_begin(void) {
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thd_wait_begin(NULL, THD_WAIT_TABLE_LOCK);
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}
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static void scheduler_wait_lock_end(void) {
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thd_wait_end(NULL);
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}
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static void scheduler_wait_sync_begin(void) {
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thd_wait_begin(NULL, THD_WAIT_SYNC);
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}
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static void scheduler_wait_sync_end(void) {
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thd_wait_end(NULL);
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}
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static void scheduler_wait_net_begin(void) {
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thd_wait_begin(NULL, THD_WAIT_NET);
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}
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static void scheduler_wait_net_end(void) {
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thd_wait_end(NULL);
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}
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};
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/**@}*/
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/**
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Common scheduler init function.
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The scheduler is either initialized by calling
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one_thread_scheduler() or one_thread_per_connection_scheduler() in
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mysqld.cc, so this init function will always be called.
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*/
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void scheduler_init() {
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thr_set_lock_wait_callback(scheduler_wait_lock_begin,
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scheduler_wait_lock_end);
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thr_set_sync_wait_callback(scheduler_wait_sync_begin,
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scheduler_wait_sync_end);
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vio_set_wait_callback(scheduler_wait_net_begin,
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scheduler_wait_net_end);
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}
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/**
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Kill notification callback, used by one-thread-per-connection
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and threadpool scheduler.
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Wakes up a thread that is stuck in read/poll/epoll/event-poll
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routines used by threadpool, such that subsequent attempt to
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read from client connection will result in IO error.
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*/
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void post_kill_notification(THD *thd)
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{
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DBUG_ENTER("post_kill_notification");
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if (current_thd == thd || thd->system_thread)
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DBUG_VOID_RETURN;
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if (thd->net.vio)
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vio_shutdown(thd->net.vio, SHUT_RD);
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DBUG_VOID_RETURN;
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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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ulong *arg_max_connections,
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uint *arg_connection_count)
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{
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scheduler_init();
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func->max_threads= *arg_max_connections + 1;
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func->max_connections= arg_max_connections;
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func->connection_count= arg_connection_count;
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func->init_new_connection_thread= init_new_connection_handler_thread;
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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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func->post_kill_notification= post_kill_notification;
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}
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#endif
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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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scheduler_init();
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func->max_threads= 1;
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func->max_connections= &max_connections;
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func->connection_count= &connection_count;
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#ifndef EMBEDDED_LIBRARY
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func->init_new_connection_thread= init_new_connection_handler_thread;
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func->add_connection= handle_connection_in_main_thread;
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#endif
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func->end_thread= no_threads_end;
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}
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