sp_cache.h

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/* -*- C++ -*- */
/* Copyright (c) 2002, 2023, Oracle and/or its affiliates.
 
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   it under the terms of the GNU General Public License, version 2.0,
   as published by the Free Software Foundation.
 
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   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
   GNU General Public License, version 2.0, for more details.
 
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   Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301  USA */
 
#ifndef _SP_CACHE_H_
#define _SP_CACHE_H_
 
#include <sys/types.h>
 
#include "my_inttypes.h"
 
/*
  Stored procedures/functions cache. This is used as follows:
   * Each thread has its own cache.
   * Each sp_head object is put into its thread cache before it is used, and
     then remains in the cache until deleted.
*/
 
class sp_cache;
class sp_head;
class sp_name;
 
/*
  Cache usage scenarios:
  1. SP execution in thread:
  1.1 While holding sp_head* pointers:
 
    // look up a routine in the cache (no checks if it is up to date or not)
    sp_cache_lookup();
 
    sp_cache_insert();
    sp_cache_invalidate();
 
  1.2 When not holding any sp_head* pointers:
    sp_cache_flush_obsolete();
 
  2. Before thread exit:
    sp_cache_clear();
*/
 
void sp_cache_clear(sp_cache **cp);
void sp_cache_insert(sp_cache **cp, sp_head *sp);
sp_head *sp_cache_lookup(sp_cache **cp, const sp_name *name);
void sp_cache_invalidate();
void sp_cache_flush_obsolete(sp_cache **cp, sp_head **sp);
int64 sp_cache_version();
void sp_cache_enforce_limit(sp_cache *cp, ulong upper_limit_for_elements);
 
#endif /* _SP_CACHE_H_ */