1 #ifndef SYS_VARS_SHARED_INCLUDED 2 #define SYS_VARS_SHARED_INCLUDED 3 4 /* Copyright (c) 2002, 2021, Oracle and/or its affiliates. 5 6 This program is free software; you can redistribute it and/or modify 7 it under the terms of the GNU General Public License, version 2.0, 8 as published by the Free Software Foundation. 9 10 This program is also distributed with certain software (including 11 but not limited to OpenSSL) that is licensed under separate terms, 12 as designated in a particular file or component or in included license 13 documentation. The authors of MySQL hereby grant you an additional 14 permission to link the program and your derivative works with the 15 separately licensed software that they have included with MySQL. 16 17 This program is distributed in the hope that it will be useful, 18 but WITHOUT ANY WARRANTY; without even the implied warranty of 19 MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the 20 GNU General Public License, version 2.0, for more details. 21 22 You should have received a copy of the GNU General Public License 23 along with this program; if not, write to the Free Software Foundation, 24 51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA */ 25 26 /** 27 @file 28 "protected" interface to sys_var - server configuration variables. 29 30 This header is included by files implementing support and utility 31 functions of sys_var's (set_var.cc) and files implementing 32 classes in the sys_var hierarchy (sql_plugin.cc) 33 */ 34 35 #include "my_global.h" 36 37 class THD; 38 class sys_var; 39 40 extern bool throw_bounds_warning(THD *thd, const char *name, 41 bool fixed, bool is_unsigned, longlong v); 42 extern bool throw_bounds_warning(THD *thd, const char *name, bool fixed, 43 double v); 44 extern sys_var *intern_find_sys_var(const char *str, size_t length); 45 46 /** wrapper to hide a mutex and an rwlock under a common interface */ 47 class PolyLock 48 { 49 public: 50 virtual void rdlock()= 0; 51 virtual void wrlock()= 0; 52 virtual void unlock()= 0; ~PolyLock()53 virtual ~PolyLock() {} 54 }; 55 56 class PolyLock_mutex: public PolyLock 57 { 58 mysql_mutex_t *mutex; 59 public: PolyLock_mutex(mysql_mutex_t * arg)60 PolyLock_mutex(mysql_mutex_t *arg): mutex(arg) {} rdlock()61 void rdlock() { mysql_mutex_lock(mutex); } wrlock()62 void wrlock() { mysql_mutex_lock(mutex); } unlock()63 void unlock() { mysql_mutex_unlock(mutex); } 64 }; 65 66 class PolyLock_rwlock: public PolyLock 67 { 68 mysql_rwlock_t *rwlock; 69 public: PolyLock_rwlock(mysql_rwlock_t * arg)70 PolyLock_rwlock(mysql_rwlock_t *arg): rwlock(arg) {} rdlock()71 void rdlock() { mysql_rwlock_rdlock(rwlock); } wrlock()72 void wrlock() { mysql_rwlock_wrlock(rwlock); } unlock()73 void unlock() { mysql_rwlock_unlock(rwlock); } 74 }; 75 76 class PolyLock_lock_log: public PolyLock 77 { 78 public: 79 void rdlock(); 80 void wrlock(); 81 void unlock(); 82 }; 83 84 class AutoWLock 85 { 86 PolyLock *lock; 87 public: AutoWLock(PolyLock * l)88 AutoWLock(PolyLock *l) : lock(l) { if (lock) lock->wrlock(); } ~AutoWLock()89 ~AutoWLock() { if (lock) lock->unlock(); } 90 }; 91 92 class AutoRLock 93 { 94 PolyLock *lock; 95 public: AutoRLock(PolyLock * l)96 AutoRLock(PolyLock *l) : lock(l) { if (lock) lock->rdlock(); } ~AutoRLock()97 ~AutoRLock() { if (lock) lock->unlock(); } 98 }; 99 100 101 #endif /* SYS_VARS_SHARED_INCLUDED */ 102