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diff --git a/storage/perfschema/pfs_instr_class.h b/storage/perfschema/pfs_instr_class.h
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+/* Copyright (C) 2008-2009 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 */
+
+#ifndef PFS_INSTR_CLASS_H
+#define PFS_INSTR_CLASS_H
+
+/**
+  @file storage/perfschema/pfs_instr_class.h
+  Performance schema instruments meta data (declarations).
+*/
+
+/**
+  Maximum length of an instrument name.
+  For example, 'wait/sync/mutex/sql/LOCK_open' is an instrument name.
+*/
+#define PFS_MAX_INFO_NAME_LENGTH 128
+
+/**
+  Maximum length of the 'full' prefix of an instrument name.
+  For example, for the instrument name 'wait/sync/mutex/sql/LOCK_open',
+  the full prefix is 'wait/sync/mutex/sql/', which in turn derives from
+  a prefix 'wait/sync/mutex' for mutexes, and a category of 'sql' for mutexes
+  of the sql layer in the server.
+*/
+#define PFS_MAX_FULL_PREFIX_NAME_LENGTH 32
+
+#include <mysql_priv.h>
+#include <mysql/psi/psi.h>
+#include "pfs_lock.h"
+#include "pfs_stat.h"
+
+/**
+  @addtogroup Performance_schema_buffers
+  @{
+*/
+
+extern my_bool pfs_enabled;
+
+/** Key, naming a synch instrument (mutex, rwlock, cond). */
+typedef unsigned int PFS_sync_key;
+/** Key, naming a thread instrument. */
+typedef unsigned int PFS_thread_key;
+/** Key, naming a file instrument. */
+typedef unsigned int PFS_file_key;
+
+struct PFS_thread;
+
+/** Information for all instrumentation. */
+struct PFS_instr_class
+{
+  /** Instrument name. */
+  char m_name[PFS_MAX_INFO_NAME_LENGTH];
+  /** Length in bytes of @c m_name. */
+  uint m_name_length;
+  /** Instrument flags. */
+  int m_flags;
+  /** True if this instrument is enabled. */
+  bool m_enabled;
+  /** True if this instrument is timed. */
+  bool m_timed;
+  /** Wait statistics chain. */
+  PFS_single_stat_chain m_wait_stat;
+};
+
+/** Instrumentation metadata for a MUTEX. */
+struct PFS_mutex_class : public PFS_instr_class
+{
+  /**
+    Lock statistics chain.
+    This statistic is not exposed in user visible tables yet.
+  */
+  PFS_single_stat_chain m_lock_stat;
+  /** Self index in @c mutex_class_array. */
+  uint m_index;
+};
+
+/** Instrumentation metadata for a RWLOCK. */
+struct PFS_rwlock_class : public PFS_instr_class
+{
+  /**
+    Read lock statistics chain.
+    This statistic is not exposed in user visible tables yet.
+  */
+  PFS_single_stat_chain m_read_lock_stat;
+  /**
+    Write lock statistics chain.
+    This statistic is not exposed in user visible tables yet.
+  */
+  PFS_single_stat_chain m_write_lock_stat;
+  /** Self index in @c rwlock_class_array. */
+  uint m_index;
+};
+
+/** Instrumentation metadata for a COND. */
+struct PFS_cond_class : public PFS_instr_class
+{
+  /**
+    Condition usage statistics.
+    This statistic is not exposed in user visible tables yet.
+  */
+  PFS_cond_stat m_cond_stat;
+  /** Self index in @c cond_class_array. */
+  uint m_index;
+};
+
+/** Instrumentation metadata of a thread. */
+struct PFS_thread_class
+{
+  /** Thread instrument name. */
+  char m_name[PFS_MAX_INFO_NAME_LENGTH];
+  /** Length in bytes of @c m_name. */
+  uint m_name_length;
+  /** True if this thread instrument is enabled. */
+  bool m_enabled;
+};
+
+/** Key identifying a table share. */
+struct PFS_table_share_key
+{
+  /**
+    Hash search key.
+    This has to be a string for LF_HASH,
+    the format is "<schema_name><0x00><object_name><0x00>"
+    @see create_table_def_key
+  */
+  char m_hash_key[NAME_LEN + 1 + NAME_LEN + 1];
+  /** Length in bytes of @c m_hash_key. */
+  uint m_key_length;
+};
+
+/** Instrumentation metadata for a table share. */
+struct PFS_table_share
+{
+  /** Internal lock. */
+  pfs_lock m_lock;
+  /** Search key. */
+  PFS_table_share_key m_key;
+  /** Schema name. */
+  const char *m_schema_name;
+  /** Length in bytes of @c m_schema_name. */
+  uint m_schema_name_length;
+  /** Table name. */
+  const char *m_table_name;
+  /** Length in bytes of @c m_table_name. */
+  uint m_table_name_length;
+  /** Wait statistics chain. */
+  PFS_single_stat_chain m_wait_stat;
+  /** True if this table instrument is enabled. */
+  bool m_enabled;
+  /** True if this table instrument is timed. */
+  bool m_timed;
+  /** True if this table instrument is aggregated. */
+  bool m_aggregated;
+};
+
+/**
+  Instrument controlling all tables.
+  This instrument is used as a default when there is no
+  entry present in SETUP_OBJECTS.
+*/
+extern PFS_instr_class global_table_class;
+
+/** Instrumentation metadata for a file. */
+struct PFS_file_class : public PFS_instr_class
+{
+  /** File usage statistics. */
+  PFS_file_stat m_file_stat;
+  /** Self index in @c file_class_array. */
+  uint m_index;
+};
+
+int init_sync_class(uint mutex_class_sizing,
+                    uint rwlock_class_sizing,
+                    uint cond_class_sizing);
+
+void cleanup_sync_class();
+int init_thread_class(uint thread_class_sizing);
+void cleanup_thread_class();
+int init_table_share(uint table_share_sizing);
+void cleanup_table_share();
+int init_table_share_hash();
+void cleanup_table_share_hash();
+int init_file_class(uint file_class_sizing);
+void cleanup_file_class();
+
+PFS_sync_key register_mutex_class(const char *name, uint name_length,
+                                  int flags);
+
+PFS_sync_key register_rwlock_class(const char *name, uint name_length,
+                                   int flags);
+
+PFS_sync_key register_cond_class(const char *name, uint name_length,
+                                 int flags);
+
+PFS_thread_key register_thread_class(const char *name, uint name_length,
+                                     int flags);
+
+PFS_file_key register_file_class(const char *name, uint name_length,
+                                 int flags);
+
+PFS_mutex_class *find_mutex_class(PSI_mutex_key key);
+PFS_mutex_class *sanitize_mutex_class(PFS_mutex_class *unsafe);
+PFS_rwlock_class *find_rwlock_class(PSI_rwlock_key key);
+PFS_rwlock_class *sanitize_rwlock_class(PFS_rwlock_class *unsafe);
+PFS_cond_class *find_cond_class(PSI_cond_key key);
+PFS_cond_class *sanitize_cond_class(PFS_cond_class *unsafe);
+PFS_thread_class *find_thread_class(PSI_thread_key key);
+PFS_thread_class *sanitize_thread_class(PFS_thread_class *unsafe);
+PFS_file_class *find_file_class(PSI_file_key key);
+PFS_file_class *sanitize_file_class(PFS_file_class *unsafe);
+
+PFS_table_share *find_or_create_table_share(PFS_thread *thread,
+                                            const char *schema_name,
+                                            uint schema_name_length,
+                                            const char *table_name,
+                                            uint table_name_length);
+
+PFS_table_share *sanitize_table_share(PFS_table_share *unsafe);
+
+extern ulong mutex_class_max;
+extern ulong mutex_class_lost;
+extern ulong rwlock_class_max;
+extern ulong rwlock_class_lost;
+extern ulong cond_class_max;
+extern ulong cond_class_lost;
+extern ulong thread_class_max;
+extern ulong thread_class_lost;
+extern ulong file_class_max;
+extern ulong file_class_lost;
+extern ulong table_share_max;
+extern ulong table_share_lost;
+extern PFS_table_share *table_share_array;
+
+void reset_instrument_class_waits();
+void reset_file_class_io();
+
+/** @} */
+#endif
+