1 /* Copyright (c) 2010, 2012, Oracle and/or its affiliates. All rights reserved.
2 
3   This program is free software; you can redistribute it and/or modify
4   it under the terms of the GNU General Public License, version 2.0,
5   as published by the Free Software Foundation.
6 
7   This program is also distributed with certain software (including
8   but not limited to OpenSSL) that is licensed under separate terms,
9   as designated in a particular file or component or in included license
10   documentation.  The authors of MySQL hereby grant you an additional
11   permission to link the program and your derivative works with the
12   separately licensed software that they have included with MySQL.
13 
14   This program is distributed in the hope that it will be useful,
15   but WITHOUT ANY WARRANTY; without even the implied warranty of
16   MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
17   GNU General Public License, version 2.0, for more details.
18 
19   You should have received a copy of the GNU General Public License
20   along with this program; if not, write to the Free Software
21   Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301, USA */
22 
23 #ifndef PFS_USER_H
24 #define PFS_USER_H
25 
26 /**
27   @file storage/perfschema/pfs_user.h
28   Performance schema user (declarations).
29 */
30 
31 #include "pfs_lock.h"
32 #include "lf.h"
33 #include "pfs_con_slice.h"
34 
35 struct PFS_global_param;
36 struct PFS_thread;
37 
38 /**
39   @addtogroup Performance_schema_buffers
40   @{
41 */
42 
43 struct PFS_user_key
44 {
45   /**
46     Hash search key.
47     This has to be a string for LF_HASH,
48     the format is "<username><0x00>"
49   */
50   char m_hash_key[USERNAME_LENGTH + 1];
51   uint m_key_length;
52 };
53 
54 struct PFS_ALIGNED PFS_user : public PFS_connection_slice
55 {
56 public:
init_refcountPFS_user57   inline void init_refcount(void)
58   {
59     PFS_atomic::store_32(& m_refcount, 1);
60   }
61 
get_refcountPFS_user62   inline int get_refcount(void)
63   {
64     return PFS_atomic::load_32(& m_refcount);
65   }
66 
inc_refcountPFS_user67   inline void inc_refcount(void)
68   {
69     PFS_atomic::add_32(& m_refcount, 1);
70   }
71 
dec_refcountPFS_user72   inline void dec_refcount(void)
73   {
74     PFS_atomic::add_32(& m_refcount, -1);
75   }
76 
77   void aggregate(void);
78   void aggregate_waits(void);
79   void aggregate_stages(void);
80   void aggregate_statements(void);
81   void aggregate_stats(void);
82   void release(void);
83 
84   /** Internal lock. */
85   pfs_lock m_lock;
86   PFS_user_key m_key;
87   const char *m_username;
88   uint m_username_length;
89 
90   ulonglong m_disconnected_count;
91 
92 private:
93   int m_refcount;
94 };
95 
96 int init_user(const PFS_global_param *param);
97 void cleanup_user(void);
98 int init_user_hash(void);
99 void cleanup_user_hash(void);
100 
101 PFS_user *
102 find_or_create_user(PFS_thread *thread,
103                     const char *username, uint username_length);
104 
105 PFS_user *sanitize_user(PFS_user *unsafe);
106 void purge_all_user(void);
107 
108 
109 /* For iterators and show status. */
110 
111 extern ulong user_max;
112 extern ulong user_lost;
113 
114 /* Exposing the data directly, for iterators. */
115 
116 extern PFS_user *user_array;
117 
118 extern LF_HASH user_hash;
119 
120 /** @} */
121 #endif
122 
123