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Edit File : sys_vars_shared.h \| Size : 2.67 KB
#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() = default; }; class PolyLock_mutex: public PolyLock { mysql_mutex_t mutex; public: PolyLock_mutex(mysql_mutex_t arg): mutex(arg) {} void rdlock() override { mysql_mutex_lock(mutex); } void wrlock() override { mysql_mutex_lock(mutex); } void unlock() override { mysql_mutex_unlock(mutex); } }; class PolyLock_rwlock: public PolyLock { mysql_rwlock_t rwlock; public: PolyLock_rwlock(mysql_rwlock_t arg): rwlock(arg) {} void rdlock() override { mysql_rwlock_rdlock(rwlock); } void wrlock() override { mysql_rwlock_wrlock(rwlock); } void unlock() override { 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 */ Back

Edit File : sys_vars_shared.h | Size : 2.67 KB

#ifndef SYS_VARS_SHARED_INCLUDED
#define SYS_VARS_SHARED_INCLUDED

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() = default;
};

class PolyLock_mutex: public PolyLock
{
  mysql_mutex_t *mutex;
public:
  PolyLock_mutex(mysql_mutex_t *arg): mutex(arg) {}
  void rdlock() override { mysql_mutex_lock(mutex); }
  void wrlock() override { mysql_mutex_lock(mutex); }
  void unlock() override { mysql_mutex_unlock(mutex); }
};

class PolyLock_rwlock: public PolyLock
{
  mysql_rwlock_t *rwlock;
public:
  PolyLock_rwlock(mysql_rwlock_t *arg): rwlock(arg) {}
  void rdlock() override { mysql_rwlock_rdlock(rwlock); }
  void wrlock() override { mysql_rwlock_wrlock(rwlock); }
  void unlock() override { 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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