1 files changed, 166 insertions, 0 deletions
diff --git a/sql/sp_cache.cc b/sql/sp_cache.cc
new file mode 100644
index 00000000000..056ac6d7e96
--- /dev/null
+++ b/sql/sp_cache.cc
@@ -0,0 +1,166 @@
+/* Copyright (C) 2002 MySQL 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; either version 2 of the License, or
+   (at your option) any later version.
+
+   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 */
+
+#ifdef __GNUC__
+#pragma implementation
+#endif
+
+#include "mysql_priv.h"
+#include "sp_cache.h"
+#include "sp_head.h"
+
+static pthread_mutex_t Cversion_lock;
+static ulong Cversion = 0;
+
+void
+sp_cache_init()
+{
+  pthread_mutex_init(&Cversion_lock, MY_MUTEX_INIT_FAST);
+}
+
+void
+sp_cache_clear(sp_cache **cp)
+{
+  sp_cache *c= *cp;
+
+  if (c)
+  {
+    delete c;
+    *cp= NULL;
+  }
+}
+
+void
+sp_cache_insert(sp_cache **cp, sp_head *sp)
+{
+  sp_cache *c= *cp;
+
+  if (! c)
+    c= new sp_cache();
+  if (c)
+  {
+    ulong v;
+
+    pthread_mutex_lock(&Cversion_lock); // LOCK
+    v= Cversion;
+    pthread_mutex_unlock(&Cversion_lock); // UNLOCK
+
+    if (c->version < v)
+    {
+      if (*cp)
+	c->remove_all();
+      c->version= v;
+    }
+    c->insert(sp);
+    if (*cp == NULL)
+      *cp= c;
+  }
+}
+
+sp_head *
+sp_cache_lookup(sp_cache **cp, sp_name *name)
+{
+  ulong v;
+  sp_cache *c= *cp;
+
+  if (! c)
+    return NULL;
+
+  pthread_mutex_lock(&Cversion_lock); // LOCK
+  v= Cversion;
+  pthread_mutex_unlock(&Cversion_lock); // UNLOCK
+
+  if (c->version < v)
+  {
+    c->remove_all();
+    c->version= v;
+    return NULL;
+  }
+  return c->lookup(name->m_qname.str, name->m_qname.length);
+}
+
+bool
+sp_cache_remove(sp_cache **cp, sp_name *name)
+{
+  sp_cache *c= *cp;
+  bool found= FALSE;
+
+  if (c)
+  {
+    ulong v;
+
+    pthread_mutex_lock(&Cversion_lock); // LOCK
+    v= Cversion++;
+    pthread_mutex_unlock(&Cversion_lock); // UNLOCK
+
+    if (c->version < v)
+      c->remove_all();
+    else
+      found= c->remove(name->m_qname.str, name->m_qname.length);
+    c->version= v+1;
+  }
+  return found;
+}
+
+void
+sp_cache_invalidate()
+{
+  pthread_mutex_lock(&Cversion_lock); // LOCK
+  Cversion++;
+  pthread_mutex_unlock(&Cversion_lock); // UNLOCK
+}
+
+static byte *
+hash_get_key_for_sp_head(const byte *ptr, uint *plen,
+			       my_bool first)
+{
+  sp_head *sp= (sp_head *)ptr;
+
+  *plen= sp->m_qname.length;
+  return (byte*) sp->m_qname.str;
+}
+
+static void
+hash_free_sp_head(void *p)
+{
+  sp_head *sp= (sp_head *)p;
+
+  delete sp;
+}
+
+sp_cache::sp_cache()
+{
+  init();
+}
+
+sp_cache::~sp_cache()
+{
+  hash_free(&m_hashtable);
+}
+
+void
+sp_cache::init()
+{
+  hash_init(&m_hashtable, system_charset_info, 0, 0, 0,
+	    hash_get_key_for_sp_head, hash_free_sp_head, 0);
+  version= 0;
+}
+
+void
+sp_cache::cleanup()
+{
+  hash_free(&m_hashtable);
+}