mirror of
https://github.com/MariaDB/server.git
synced 2025-10-31 19:06:14 +01:00
138 lines
3.5 KiB
C++
138 lines
3.5 KiB
C++
/* Copyright (c) 2007, 2013, Oracle and/or its affiliates.
|
|
Copyright (c) 2012, 2014, SkySQL 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 02110-1335 USA */
|
|
|
|
/*
|
|
Implementation for the thread scheduler
|
|
*/
|
|
|
|
#include "mariadb.h"
|
|
#include "mysqld.h"
|
|
#include "scheduler.h"
|
|
#include "sql_class.h"
|
|
#include "sql_callback.h"
|
|
#include <violite.h>
|
|
|
|
/** @internal
|
|
Helper functions to allow mysys to call the thread scheduler when
|
|
waiting for locks.
|
|
*/
|
|
|
|
/**@{*/
|
|
extern "C"
|
|
{
|
|
static void scheduler_wait_lock_begin(void) {
|
|
thd_wait_begin(NULL, THD_WAIT_TABLE_LOCK);
|
|
}
|
|
|
|
static void scheduler_wait_lock_end(void) {
|
|
thd_wait_end(NULL);
|
|
}
|
|
|
|
static void scheduler_wait_sync_begin(void) {
|
|
thd_wait_begin(NULL, THD_WAIT_SYNC);
|
|
}
|
|
|
|
static void scheduler_wait_sync_end(void) {
|
|
thd_wait_end(NULL);
|
|
}
|
|
|
|
static void scheduler_wait_net_begin(void) {
|
|
thd_wait_begin(NULL, THD_WAIT_NET);
|
|
}
|
|
|
|
static void scheduler_wait_net_end(void) {
|
|
thd_wait_end(NULL);
|
|
}
|
|
|
|
};
|
|
/**@}*/
|
|
|
|
/**
|
|
Common scheduler init function.
|
|
|
|
The scheduler is either initialized by calling
|
|
one_thread_scheduler() or one_thread_per_connection_scheduler() in
|
|
mysqld.cc, so this init function will always be called.
|
|
*/
|
|
|
|
void scheduler_init()
|
|
{
|
|
thr_set_lock_wait_callback(scheduler_wait_lock_begin,
|
|
scheduler_wait_lock_end);
|
|
thr_set_sync_wait_callback(scheduler_wait_sync_begin,
|
|
scheduler_wait_sync_end);
|
|
|
|
vio_set_wait_callback(scheduler_wait_net_begin,
|
|
scheduler_wait_net_end);
|
|
}
|
|
|
|
|
|
/**
|
|
Kill notification callback, used by one-thread-per-connection
|
|
and threadpool scheduler.
|
|
|
|
Wakes up a thread that is stuck in read/poll/epoll/event-poll
|
|
routines used by threadpool, such that subsequent attempt to
|
|
read from client connection will result in IO error.
|
|
*/
|
|
|
|
void post_kill_notification(THD *thd)
|
|
{
|
|
DBUG_ENTER("post_kill_notification");
|
|
if (current_thd == thd || thd->system_thread)
|
|
DBUG_VOID_RETURN;
|
|
|
|
if (thd->net.vio)
|
|
vio_shutdown(thd->net.vio, SHUT_RD);
|
|
DBUG_VOID_RETURN;
|
|
}
|
|
|
|
/*
|
|
Initialize scheduler for --thread-handling=one-thread-per-connection
|
|
*/
|
|
|
|
#ifndef EMBEDDED_LIBRARY
|
|
|
|
void one_thread_per_connection_scheduler(scheduler_functions *func,
|
|
ulong *arg_max_connections,
|
|
Atomic_counter<uint> *arg_connection_count)
|
|
{
|
|
scheduler_init();
|
|
func->max_threads= *arg_max_connections + 1;
|
|
func->max_connections= arg_max_connections;
|
|
func->connection_count= arg_connection_count;
|
|
func->add_connection= create_thread_to_handle_connection;
|
|
func->post_kill_notification= post_kill_notification;
|
|
}
|
|
#else
|
|
void handle_connection_in_main_thread(CONNECT *connect)
|
|
{
|
|
}
|
|
#endif
|
|
|
|
/*
|
|
Initialize scheduler for --thread-handling=no-threads
|
|
*/
|
|
|
|
void one_thread_scheduler(scheduler_functions *func,
|
|
Atomic_counter<uint> *arg_connection_count)
|
|
{
|
|
scheduler_init();
|
|
func->max_threads= 1;
|
|
func->max_connections= &max_connections;
|
|
func->connection_count= arg_connection_count;
|
|
func->add_connection= handle_connection_in_main_thread;
|
|
}
|