mirror of
https://github.com/MariaDB/server.git
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167 lines
3.0 KiB
C++
167 lines
3.0 KiB
C++
/* Copyright (C) 2002 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; either version 2 of the License, or
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(at your option) any later version.
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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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#ifdef __GNUC__
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#pragma implementation
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#endif
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#include "mysql_priv.h"
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#include "sp_cache.h"
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#include "sp_head.h"
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static pthread_mutex_t Cversion_lock;
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static ulong Cversion = 0;
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void
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sp_cache_init()
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{
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pthread_mutex_init(&Cversion_lock, MY_MUTEX_INIT_FAST);
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}
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void
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sp_cache_clear(sp_cache **cp)
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{
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sp_cache *c= *cp;
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if (c)
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{
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delete c;
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*cp= NULL;
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}
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}
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void
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sp_cache_insert(sp_cache **cp, sp_head *sp)
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{
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sp_cache *c= *cp;
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if (! c)
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c= new sp_cache();
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if (c)
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{
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ulong v;
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pthread_mutex_lock(&Cversion_lock); // LOCK
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v= Cversion;
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pthread_mutex_unlock(&Cversion_lock); // UNLOCK
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if (c->version < v)
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{
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if (*cp)
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c->remove_all();
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c->version= v;
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}
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c->insert(sp);
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if (*cp == NULL)
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*cp= c;
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}
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}
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sp_head *
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sp_cache_lookup(sp_cache **cp, sp_name *name)
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{
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ulong v;
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sp_cache *c= *cp;
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if (! c)
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return NULL;
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pthread_mutex_lock(&Cversion_lock); // LOCK
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v= Cversion;
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pthread_mutex_unlock(&Cversion_lock); // UNLOCK
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if (c->version < v)
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{
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c->remove_all();
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c->version= v;
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return NULL;
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}
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return c->lookup(name->m_qname.str, name->m_qname.length);
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}
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bool
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sp_cache_remove(sp_cache **cp, sp_name *name)
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{
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sp_cache *c= *cp;
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bool found= FALSE;
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if (c)
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{
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ulong v;
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pthread_mutex_lock(&Cversion_lock); // LOCK
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v= Cversion++;
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pthread_mutex_unlock(&Cversion_lock); // UNLOCK
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if (c->version < v)
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c->remove_all();
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else
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found= c->remove(name->m_qname.str, name->m_qname.length);
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c->version= v+1;
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}
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return found;
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}
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void
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sp_cache_invalidate()
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{
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pthread_mutex_lock(&Cversion_lock); // LOCK
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Cversion++;
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pthread_mutex_unlock(&Cversion_lock); // UNLOCK
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}
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static byte *
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hash_get_key_for_sp_head(const byte *ptr, uint *plen,
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my_bool first)
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{
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sp_head *sp= (sp_head *)ptr;
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*plen= sp->m_qname.length;
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return (byte*) sp->m_qname.str;
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}
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static void
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hash_free_sp_head(void *p)
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{
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sp_head *sp= (sp_head *)p;
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delete sp;
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}
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sp_cache::sp_cache()
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{
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init();
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}
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sp_cache::~sp_cache()
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{
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hash_free(&m_hashtable);
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}
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void
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sp_cache::init()
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{
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hash_init(&m_hashtable, system_charset_info, 0, 0, 0,
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hash_get_key_for_sp_head, hash_free_sp_head, 0);
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version= 0;
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}
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void
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sp_cache::cleanup()
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{
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hash_free(&m_hashtable);
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}
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