mirror of
https://github.com/MariaDB/server.git
synced 2025-01-18 21:12:26 +01:00
126 lines
3.2 KiB
C
126 lines
3.2 KiB
C
/*****************************************************************************
|
|
|
|
Copyright (c) 1996, 2009, Innobase Oy. All Rights Reserved.
|
|
|
|
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., 59 Temple
|
|
Place, Suite 330, Boston, MA 02111-1307 USA
|
|
|
|
*****************************************************************************/
|
|
|
|
/**************************************************//**
|
|
@file srv/srv0que.c
|
|
Server query execution
|
|
|
|
Created 6/5/1996 Heikki Tuuri
|
|
*******************************************************/
|
|
|
|
#include "srv0que.h"
|
|
|
|
#include "srv0srv.h"
|
|
#include "sync0sync.h"
|
|
#include "os0thread.h"
|
|
#include "usr0sess.h"
|
|
#include "que0que.h"
|
|
|
|
/**********************************************************************//**
|
|
Checks if there is work to do in the server task queue. If there is, the
|
|
thread starts processing a task. Before leaving, it again checks the task
|
|
queue and picks a new task if any exists. This is called by a SRV_WORKER
|
|
thread. */
|
|
UNIV_INTERN
|
|
void
|
|
srv_que_task_queue_check(void)
|
|
/*==========================*/
|
|
{
|
|
que_thr_t* thr;
|
|
|
|
for (;;) {
|
|
mutex_enter(&kernel_mutex);
|
|
|
|
thr = UT_LIST_GET_FIRST(srv_sys->tasks);
|
|
|
|
if (thr == NULL) {
|
|
mutex_exit(&kernel_mutex);
|
|
|
|
return;
|
|
}
|
|
|
|
UT_LIST_REMOVE(queue, srv_sys->tasks, thr);
|
|
|
|
mutex_exit(&kernel_mutex);
|
|
|
|
que_run_threads(thr);
|
|
}
|
|
}
|
|
|
|
/**********************************************************************//**
|
|
Performs round-robin on the server tasks. This is called by a SRV_WORKER
|
|
thread every second or so.
|
|
@return the new (may be == thr) query thread to run */
|
|
UNIV_INTERN
|
|
que_thr_t*
|
|
srv_que_round_robin(
|
|
/*================*/
|
|
que_thr_t* thr) /*!< in: query thread */
|
|
{
|
|
que_thr_t* new_thr;
|
|
|
|
ut_ad(thr);
|
|
ut_ad(thr->state == QUE_THR_RUNNING);
|
|
|
|
mutex_enter(&kernel_mutex);
|
|
|
|
UT_LIST_ADD_LAST(queue, srv_sys->tasks, thr);
|
|
|
|
new_thr = UT_LIST_GET_FIRST(srv_sys->tasks);
|
|
|
|
mutex_exit(&kernel_mutex);
|
|
|
|
return(new_thr);
|
|
}
|
|
|
|
/**********************************************************************//**
|
|
Enqueues a task to server task queue and releases a worker thread, if there
|
|
is a suspended one. */
|
|
UNIV_INTERN
|
|
void
|
|
srv_que_task_enqueue_low(
|
|
/*=====================*/
|
|
que_thr_t* thr) /*!< in: query thread */
|
|
{
|
|
ut_ad(thr);
|
|
ut_ad(mutex_own(&kernel_mutex));
|
|
|
|
UT_LIST_ADD_LAST(queue, srv_sys->tasks, thr);
|
|
|
|
srv_release_threads(SRV_WORKER, 1);
|
|
}
|
|
|
|
/**********************************************************************//**
|
|
Enqueues a task to server task queue and releases a worker thread, if there
|
|
is a suspended one. */
|
|
UNIV_INTERN
|
|
void
|
|
srv_que_task_enqueue(
|
|
/*=================*/
|
|
que_thr_t* thr) /*!< in: query thread */
|
|
{
|
|
ut_ad(thr);
|
|
|
|
ut_a(0); /* Under MySQL this is never called */
|
|
|
|
mutex_enter(&kernel_mutex);
|
|
|
|
srv_que_task_enqueue_low(thr);
|
|
|
|
mutex_exit(&kernel_mutex);
|
|
}
|