1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
|
/* Copyright (c) 2000, 2010, Oracle and/or its affiliates. All rights reserved.
Copyright (c) 2017, MariaDB Corporation.
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 */
/* For use with thr_lock:s */
#ifndef _thr_lock_h
#define _thr_lock_h
#ifdef __cplusplus
extern "C" {
#endif
#include <my_pthread.h>
#include <my_list.h>
struct st_thr_lock;
extern ulong locks_immediate,locks_waited ;
/*
Important: if a new lock type is added, a matching lock description
must be added to sql_test.cc's lock_descriptions array.
*/
enum thr_lock_type { TL_IGNORE=-1,
TL_UNLOCK, /* UNLOCK ANY LOCK */
/*
Parser only! At open_tables() becomes TL_READ or
TL_READ_NO_INSERT depending on the binary log format
(SBR/RBR) and on the table category (log table).
Used for tables that are read by statements which
modify tables.
*/
TL_READ_DEFAULT,
TL_READ, /* Read lock */
TL_READ_WITH_SHARED_LOCKS,
/* High prior. than TL_WRITE. Allow concurrent insert */
TL_READ_HIGH_PRIORITY,
/* READ, Don't allow concurrent insert */
TL_READ_NO_INSERT,
/*
Write lock, but allow other threads to read / write.
Used by BDB tables in MySQL to mark that someone is
reading/writing to the table.
*/
TL_WRITE_ALLOW_WRITE,
/*
WRITE lock used by concurrent insert. Will allow
READ, if one could use concurrent insert on table.
*/
TL_WRITE_CONCURRENT_INSERT,
/* Write used by INSERT DELAYED. Allows READ locks */
TL_WRITE_DELAYED,
/*
parser only! Late bound low_priority flag.
At open_tables() becomes thd->update_lock_default.
*/
TL_WRITE_DEFAULT,
/* WRITE lock that has lower priority than TL_READ */
TL_WRITE_LOW_PRIORITY,
/* Normal WRITE lock */
TL_WRITE,
/* Abort new lock request with an error */
TL_WRITE_ONLY};
enum enum_thr_lock_result { THR_LOCK_SUCCESS= 0, THR_LOCK_ABORTED= 1,
THR_LOCK_WAIT_TIMEOUT= 2, THR_LOCK_DEADLOCK= 3 };
/* Priority for locks */
#define THR_LOCK_LATE_PRIV 1U /* For locks to be merged with org lock */
#define THR_LOCK_MERGE_PRIV 2U /* For merge tables */
#define THR_UNLOCK_UPDATE_STATUS 1U
extern ulong max_write_lock_count;
extern my_bool thr_lock_inited;
extern enum thr_lock_type thr_upgraded_concurrent_insert_lock;
/*
A description of the thread which owns the lock. The address
of an instance of this structure is used to uniquely identify the thread.
*/
typedef struct st_thr_lock_info
{
pthread_t thread;
my_thread_id thread_id;
void *mysql_thd; // THD pointer
} THR_LOCK_INFO;
typedef struct st_thr_lock_data {
THR_LOCK_INFO *owner;
struct st_thr_lock_data *next,**prev;
struct st_thr_lock *lock;
mysql_cond_t *cond;
void *status_param; /* Param to status functions */
void *debug_print_param; /* For error messages */
struct PSI_table *m_psi;
enum thr_lock_type type;
enum thr_lock_type org_type; /* Cache for MariaDB */
uint priority;
} THR_LOCK_DATA;
struct st_lock_list {
THR_LOCK_DATA *data,**last;
};
typedef struct st_thr_lock {
LIST list;
mysql_mutex_t mutex;
struct st_lock_list read_wait;
struct st_lock_list read;
struct st_lock_list write_wait;
struct st_lock_list write;
/* write_lock_count is incremented for write locks and reset on read locks */
ulong write_lock_count;
uint read_no_write_count;
void (*get_status)(void*, my_bool); /* When one gets a lock */
void (*copy_status)(void*,void*);
void (*update_status)(void*); /* Before release of write */
void (*restore_status)(void*); /* Before release of read */
my_bool (*start_trans)(void*); /* When all locks are taken */
my_bool (*check_status)(void *);
void (*fix_status)(void *, void *);/* For thr_merge_locks() */
const char *name; /* Used for error reporting */
my_bool allow_multiple_concurrent_insert;
} THR_LOCK;
extern LIST *thr_lock_thread_list;
extern mysql_mutex_t THR_LOCK_lock;
struct st_my_thread_var;
my_bool init_thr_lock(void); /* Must be called once/thread */
void thr_lock_info_init(THR_LOCK_INFO *info, struct st_my_thread_var *tmp);
void thr_lock_init(THR_LOCK *lock);
void thr_lock_delete(THR_LOCK *lock);
void thr_lock_data_init(THR_LOCK *lock,THR_LOCK_DATA *data,
void *status_param);
void thr_unlock(THR_LOCK_DATA *data, uint unlock_flags);
enum enum_thr_lock_result thr_multi_lock(THR_LOCK_DATA **data,
uint count, THR_LOCK_INFO *owner,
ulong lock_wait_timeout);
void thr_multi_unlock(THR_LOCK_DATA **data,uint count, uint unlock_flags);
void thr_merge_locks(THR_LOCK_DATA **data, uint org_count, uint new_count);
void thr_abort_locks(THR_LOCK *lock, my_bool upgrade_lock);
my_bool thr_abort_locks_for_thread(THR_LOCK *lock, my_thread_id thread);
void thr_print_locks(void); /* For debugging */
my_bool thr_upgrade_write_delay_lock(THR_LOCK_DATA *data,
enum thr_lock_type new_lock_type,
ulong lock_wait_timeout);
void thr_downgrade_write_lock(THR_LOCK_DATA *data,
enum thr_lock_type new_lock_type);
my_bool thr_reschedule_write_lock(THR_LOCK_DATA *data,
ulong lock_wait_timeout);
void thr_set_lock_wait_callback(void (*before_wait)(void),
void (*after_wait)(void));
#ifdef WITH_WSREP
typedef my_bool (* wsrep_thd_is_brute_force_fun)(const MYSQL_THD, my_bool);
typedef my_bool(* wsrep_abort_thd_fun)(const MYSQL_THD, MYSQL_THD, my_bool);
typedef my_bool (* wsrep_on_fun)(const MYSQL_THD);
void wsrep_thr_lock_init(
wsrep_thd_is_brute_force_fun bf_fun, wsrep_abort_thd_fun abort_fun,
my_bool debug, my_bool convert_LOCK_to_trx, wsrep_on_fun on_fun);
#endif
#ifdef __cplusplus
}
#endif
#endif /* _thr_lock_h */
|
