#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 #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 */