109 lines
3.2 KiB
C++
109 lines
3.2 KiB
C++
#ifndef SYS_VARS_SHARED_INCLUDED
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#define SYS_VARS_SHARED_INCLUDED
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/* Copyright (c) 2002, 2018, 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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/**
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@file
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"protected" interface to sys_var - server configuration variables.
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This header is included by files implementing support and utility
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functions of sys_var's (set_var.cc) and files implementing
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classes in the sys_var hierarchy (sql_plugin.cc)
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*/
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#include "mysql/psi/mysql_mutex.h"
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#include "mysql/psi/mysql_thread.h" // mysql_mutex_t
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#include "sql/sql_table.h"
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class THD;
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class sys_var;
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extern bool throw_bounds_warning(THD *thd, const char *name, bool fixed,
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bool is_unsigned, longlong v);
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extern bool throw_bounds_warning(THD *thd, const char *name, bool fixed,
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double v);
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extern sys_var *intern_find_sys_var(const char *str, size_t length);
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/** wrapper to hide a mutex and an rwlock under a common interface */
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class PolyLock {
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public:
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virtual void rdlock() = 0;
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virtual void wrlock() = 0;
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virtual void unlock() = 0;
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virtual ~PolyLock() {}
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};
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class PolyLock_mutex : public PolyLock {
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mysql_mutex_t *mutex;
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public:
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PolyLock_mutex(mysql_mutex_t *arg) : mutex(arg) {}
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void rdlock() { mysql_mutex_lock(mutex); }
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void wrlock() { mysql_mutex_lock(mutex); }
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void unlock() { mysql_mutex_unlock(mutex); }
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};
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class PolyLock_rwlock : public PolyLock {
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mysql_rwlock_t *rwlock;
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public:
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PolyLock_rwlock(mysql_rwlock_t *arg) : rwlock(arg) {}
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void rdlock() { mysql_rwlock_rdlock(rwlock); }
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void wrlock() { mysql_rwlock_wrlock(rwlock); }
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void unlock() { mysql_rwlock_unlock(rwlock); }
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};
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class PolyLock_lock_log : public PolyLock {
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public:
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void rdlock();
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void wrlock();
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void unlock();
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};
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class AutoWLock {
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PolyLock *lock;
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public:
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AutoWLock(PolyLock *l) : lock(l) {
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if (lock) lock->wrlock();
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}
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~AutoWLock() {
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if (lock) lock->unlock();
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}
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};
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class AutoRLock {
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PolyLock *lock;
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public:
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AutoRLock(PolyLock *l) : lock(l) {
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if (lock) lock->rdlock();
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}
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~AutoRLock() {
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if (lock) lock->unlock();
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}
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};
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#endif /* SYS_VARS_SHARED_INCLUDED */
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