1 files changed, 81 insertions, 0 deletions
diff --git a/sql/sys_vars_shared.h b/sql/sys_vars_shared.h
new file mode 100644
index 00000000000..e996fdba52e
--- /dev/null
+++ b/sql/sys_vars_shared.h
@@ -0,0 +1,81 @@
+/* Copyright (C) 2002-2006 MySQL AB, 2009 Sun Microsystems, Inc.
+
+   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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  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 <mysql_priv.h>
+#include "set_var.h"
+
+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, uint 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
+{
+  pthread_mutex_t *mutex;
+public:
+  PolyLock_mutex(pthread_mutex_t *arg): mutex(arg) {}
+  void rdlock() { pthread_mutex_lock(mutex); }
+  void wrlock() { pthread_mutex_lock(mutex); }
+  void unlock() { pthread_mutex_unlock(mutex); }
+};
+
+class PolyLock_rwlock: public PolyLock
+{
+  rw_lock_t *rwlock;
+public:
+  PolyLock_rwlock(rw_lock_t *arg): rwlock(arg) {}
+  void rdlock() { rw_rdlock(rwlock); }
+  void wrlock() { rw_wrlock(rwlock); }
+  void unlock() { rw_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(); }
+};
+