Current File : //usr/include/mysql/server/private/sys_vars_shared.h
#ifndef SYS_VARS_SHARED_INCLUDED
#define SYS_VARS_SHARED_INCLUDED
/* Copyright (c) 2002, 2010, Oracle and/or its affiliates. All rights reserved.
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; version 2 of the License.
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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
/**
@file
"protected" interface to sys_var - server configuration variables.
This header is included by files implementing support and utility
functions of sys_var's (set_var.cc) and files implementing
classes in the sys_var hierarchy (sql_plugin.cc)
*/
#include <sql_priv.h>
#include "set_var.h"
extern bool throw_bounds_warning(THD *thd, const char *name,const char *v);
extern bool throw_bounds_warning(THD *thd, const char *name,
bool fixed, bool is_unsigned, longlong v);
extern bool throw_bounds_warning(THD *thd, const char *name, bool fixed,
double v);
extern sys_var *intern_find_sys_var(const char *str, size_t length);
extern sys_var_chain all_sys_vars;
/** wrapper to hide a mutex and an rwlock under a common interface */
class PolyLock
{
public:
virtual void rdlock()= 0;
virtual void wrlock()= 0;
virtual void unlock()= 0;
virtual ~PolyLock() {}
};
class PolyLock_mutex: public PolyLock
{
mysql_mutex_t *mutex;
public:
PolyLock_mutex(mysql_mutex_t *arg): mutex(arg) {}
void rdlock() { mysql_mutex_lock(mutex); }
void wrlock() { mysql_mutex_lock(mutex); }
void unlock() { mysql_mutex_unlock(mutex); }
};
class PolyLock_rwlock: public PolyLock
{
mysql_rwlock_t *rwlock;
public:
PolyLock_rwlock(mysql_rwlock_t *arg): rwlock(arg) {}
void rdlock() { mysql_rwlock_rdlock(rwlock); }
void wrlock() { mysql_rwlock_wrlock(rwlock); }
void unlock() { mysql_rwlock_unlock(rwlock); }
};
class AutoWLock
{
PolyLock *lock;
public:
AutoWLock(PolyLock *l) : lock(l) { if (lock) lock->wrlock(); }
~AutoWLock() { if (lock) lock->unlock(); }
};
class AutoRLock
{
PolyLock *lock;
public:
AutoRLock(PolyLock *l) : lock(l) { if (lock) lock->rdlock(); }
~AutoRLock() { if (lock) lock->unlock(); }
};
#endif /* SYS_VARS_SHARED_INCLUDED */
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