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/* Copyright (C) MariaDB Corporation 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 Street, Fifth Floor, Boston, MA 02110-1335 USA */
/**
@file user_connect.cc
@brief
Implements the user_connect class.
@details
To support multi_threading, each query creates and use a PlugDB "user"
that is a connection with its personnal memory allocation.
@note
Author Olivier Bertrand
*/
/****************************************************************************/
/* Author: Olivier Bertrand -- bertrandop@gmail.com -- 2004-2020 */
/****************************************************************************/
#define DONT_DEFINE_VOID
#define MYSQL_SERVER
#include <my_global.h>
#include "sql_class.h"
#undef OFFSET
#define NOPARSE
#include "osutil.h"
#include "global.h"
#include "plgdbsem.h"
#include "connect.h"
#include "user_connect.h"
#include "mycat.h"
extern pthread_mutex_t usrmut;
/****************************************************************************/
/* Initialize the user_connect static member. */
/****************************************************************************/
PCONNECT user_connect::to_users= NULL;
/****************************************************************************/
/* Get the work_size SESSION variable value . */
/****************************************************************************/
size_t GetWorkSize(void);
void SetWorkSize(size_t);
/* -------------------------- class user_connect -------------------------- */
/****************************************************************************/
/* Constructor. */
/****************************************************************************/
user_connect::user_connect(THD *thd)
{
thdp= thd;
next= NULL;
previous= NULL;
g= NULL;
last_query_id= 0;
count= 0;
// Statistics
nrd= fnd= nfd= 0;
tb1= 0;
} // end of user_connect constructor
/****************************************************************************/
/* Destructor. */
/****************************************************************************/
user_connect::~user_connect()
{
// Terminate CONNECT and Plug-like environment, should return NULL
g= CntExit(g);
} // end of user_connect destructor
/****************************************************************************/
/* Initialization. */
/****************************************************************************/
bool user_connect::user_init()
{
// Initialize Plug-like environment
size_t worksize= GetWorkSize();
PACTIVITY ap= NULL;
PDBUSER dup= NULL;
g= PlugInit(NULL, (size_t)worksize);
// Check whether the initialization is complete
if (!g || !g->Sarea || PlugSubSet(g->Sarea, g->Sarea_Size)
|| !(dup= PlgMakeUser(g))) {
if (g)
printf("%s\n", g->Message);
(void) PlugExit(g);
g= 0;
if (dup)
free(dup);
return true;
} // endif g->
dup->Catalog= new MYCAT(NULL);
ap= new ACTIVITY;
memset(ap, 0, sizeof(ACTIVITY));
strcpy(ap->Ap_Name, "CONNECT");
g->Activityp= ap;
g->Activityp->Aptr= dup;
pthread_mutex_lock(&usrmut);
next= to_users;
to_users= this;
if (next)
next->previous= this;
count = 1;
pthread_mutex_unlock(&usrmut);
last_query_id= thdp->query_id;
return false;
} // end of user_init
void user_connect::SetHandler(ha_connect *hc)
{
PDBUSER dup= (PDBUSER)g->Activityp->Aptr;
MYCAT *mc= (MYCAT*)dup->Catalog;
mc->SetHandler(hc);
}
/****************************************************************************/
/* Check whether we begin a new query and if so cleanup the previous one. */
/****************************************************************************/
bool user_connect::CheckCleanup(bool force)
{
if (thdp->query_id > last_query_id || force) {
size_t worksize = GetWorkSize();
PlugCleanup(g, true);
if (worksize != g->Sarea_Size) {
FreeSarea(g);
g->Saved_Size = g->Sarea_Size;
// Check whether the work area could be allocated
if (AllocSarea(g, worksize)) {
AllocSarea(g, g->Saved_Size);
SetWorkSize(g->Sarea_Size); // Was too big
} // endif sarea
} // endif worksize
PlugSubSet(g->Sarea, g->Sarea_Size);
g->Xchk = NULL;
g->Createas = false;
g->Alchecked = 0;
g->Mrr = 0;
g->More = 0;
g->Saved_Size = 0;
last_query_id= thdp->query_id;
if (trace(65) && !force)
printf("=====> Begin new query %llu\n", last_query_id);
return true;
} // endif query_id
return false;
} // end of CheckCleanup
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