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69 lines
2.2 KiB
69 lines
2.2 KiB
5 months ago
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/* -*- C++ -*- */
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/* Copyright (c) 2002, 2017, Oracle and/or its affiliates. All rights reserved.
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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, version 2.0,
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as published by the Free Software Foundation.
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This program is also distributed with certain software (including
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but not limited to OpenSSL) that is licensed under separate terms,
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as designated in a particular file or component or in included license
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documentation. The authors of MySQL hereby grant you an additional
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permission to link the program and your derivative works with the
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separately licensed software that they have included with MySQL.
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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, version 2.0, 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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA */
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#ifndef _SP_CACHE_H_
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#define _SP_CACHE_H_
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#include <sys/types.h>
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#include "my_inttypes.h"
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/*
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Stored procedures/functions cache. This is used as follows:
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* Each thread has its own cache.
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* Each sp_head object is put into its thread cache before it is used, and
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then remains in the cache until deleted.
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*/
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class sp_cache;
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class sp_head;
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class sp_name;
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/*
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Cache usage scenarios:
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1. SP execution in thread:
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1.1 While holding sp_head* pointers:
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// look up a routine in the cache (no checks if it is up to date or not)
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sp_cache_lookup();
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sp_cache_insert();
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sp_cache_invalidate();
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1.2 When not holding any sp_head* pointers:
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sp_cache_flush_obsolete();
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2. Before thread exit:
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sp_cache_clear();
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*/
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void sp_cache_clear(sp_cache **cp);
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void sp_cache_insert(sp_cache **cp, sp_head *sp);
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sp_head *sp_cache_lookup(sp_cache **cp, sp_name *name);
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void sp_cache_invalidate();
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void sp_cache_flush_obsolete(sp_cache **cp, sp_head **sp);
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int64 sp_cache_version();
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void sp_cache_enforce_limit(sp_cache *cp, ulong upper_limit_for_elements);
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#endif /* _SP_CACHE_H_ */
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