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
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
|
/******************************************************
Mini-transaction buffer
(c) 1995 Innobase Oy
Created 11/26/1995 Heikki Tuuri
*******************************************************/
#include "sync0sync.h"
#include "sync0rw.h"
#include "mach0data.h"
/*******************************************************************
Starts a mini-transaction and creates a mini-transaction handle
and a buffer in the memory buffer given by the caller. */
UNIV_INLINE
mtr_t*
mtr_start(
/*======*/
/* out: mtr buffer which also acts as
the mtr handle */
mtr_t* mtr) /* in: memory buffer for the mtr buffer */
{
dyn_array_create(&(mtr->memo));
dyn_array_create(&(mtr->log));
mtr->log_mode = MTR_LOG_ALL;
mtr->modifications = FALSE;
mtr->n_log_recs = 0;
#ifdef UNIV_DEBUG
mtr->state = MTR_ACTIVE;
mtr->magic_n = MTR_MAGIC_N;
#endif
return(mtr);
}
/*******************************************************
Pushes an object to an mtr memo stack. */
UNIV_INLINE
void
mtr_memo_push(
/*==========*/
mtr_t* mtr, /* in: mtr */
void* object, /* in: object */
ulint type) /* in: object type: MTR_MEMO_S_LOCK, ... */
{
dyn_array_t* memo;
mtr_memo_slot_t* slot;
ut_ad(object);
ut_ad(type >= MTR_MEMO_PAGE_S_FIX);
ut_ad(type <= MTR_MEMO_X_LOCK);
ut_ad(mtr);
ut_ad(mtr->magic_n == MTR_MAGIC_N);
memo = &(mtr->memo);
slot = dyn_array_push(memo, sizeof(mtr_memo_slot_t));
slot->object = object;
slot->type = type;
}
/**************************************************************
Sets and returns a savepoint in mtr. */
UNIV_INLINE
ulint
mtr_set_savepoint(
/*==============*/
/* out: savepoint */
mtr_t* mtr) /* in: mtr */
{
dyn_array_t* memo;
ut_ad(mtr);
ut_ad(mtr->magic_n == MTR_MAGIC_N);
memo = &(mtr->memo);
return(dyn_array_get_data_size(memo));
}
/**************************************************************
Releases the (index tree) s-latch stored in an mtr memo after a
savepoint. */
UNIV_INLINE
void
mtr_release_s_latch_at_savepoint(
/*=============================*/
mtr_t* mtr, /* in: mtr */
ulint savepoint, /* in: savepoint */
rw_lock_t* lock) /* in: latch to release */
{
mtr_memo_slot_t* slot;
dyn_array_t* memo;
ut_ad(mtr);
ut_ad(mtr->magic_n == MTR_MAGIC_N);
ut_ad(mtr->state == MTR_ACTIVE);
memo = &(mtr->memo);
ut_ad(dyn_array_get_data_size(memo) > savepoint);
slot = dyn_array_get_element(memo, savepoint);
ut_ad(slot->object == lock);
ut_ad(slot->type == MTR_MEMO_S_LOCK);
rw_lock_s_unlock(lock);
slot->object = NULL;
}
#ifdef UNIV_DEBUG
/**************************************************************
Checks if memo contains the given item. */
UNIV_INLINE
ibool
mtr_memo_contains(
/*==============*/
/* out: TRUE if contains */
mtr_t* mtr, /* in: mtr */
void* object, /* in: object to search */
ulint type) /* in: type of object */
{
mtr_memo_slot_t* slot;
dyn_array_t* memo;
ulint offset;
ut_ad(mtr);
ut_ad(mtr->magic_n == MTR_MAGIC_N);
memo = &(mtr->memo);
offset = dyn_array_get_data_size(memo);
while (offset > 0) {
offset -= sizeof(mtr_memo_slot_t);
slot = dyn_array_get_element(memo, offset);
if ((object == slot->object) && (type == slot->type)) {
return(TRUE);
}
}
return(FALSE);
}
#endif /* UNIV_DEBUG */
/*******************************************************************
Returns the log object of a mini-transaction buffer. */
UNIV_INLINE
dyn_array_t*
mtr_get_log(
/*========*/
/* out: log */
mtr_t* mtr) /* in: mini-transaction */
{
ut_ad(mtr);
ut_ad(mtr->magic_n == MTR_MAGIC_N);
return(&(mtr->log));
}
/*******************************************************************
Gets the logging mode of a mini-transaction. */
UNIV_INLINE
ulint
mtr_get_log_mode(
/*=============*/
/* out: logging mode: MTR_LOG_NONE, ... */
mtr_t* mtr) /* in: mtr */
{
ut_ad(mtr);
ut_ad(mtr->log_mode >= MTR_LOG_ALL);
ut_ad(mtr->log_mode <= MTR_LOG_SHORT_INSERTS);
return(mtr->log_mode);
}
/*******************************************************************
Changes the logging mode of a mini-transaction. */
UNIV_INLINE
ulint
mtr_set_log_mode(
/*=============*/
/* out: old mode */
mtr_t* mtr, /* in: mtr */
ulint mode) /* in: logging mode: MTR_LOG_NONE, ... */
{
ulint old_mode;
ut_ad(mtr);
ut_ad(mode >= MTR_LOG_ALL);
ut_ad(mode <= MTR_LOG_SHORT_INSERTS);
old_mode = mtr->log_mode;
if ((mode == MTR_LOG_SHORT_INSERTS) && (old_mode == MTR_LOG_NONE)) {
/* Do nothing */
} else {
mtr->log_mode = mode;
}
ut_ad(old_mode >= MTR_LOG_ALL);
ut_ad(old_mode <= MTR_LOG_SHORT_INSERTS);
return(old_mode);
}
/*************************************************************************
Locks a lock in s-mode. */
UNIV_INLINE
void
mtr_s_lock_func(
/*============*/
rw_lock_t* lock, /* in: rw-lock */
const char* file, /* in: file name */
ulint line, /* in: line number */
mtr_t* mtr) /* in: mtr */
{
ut_ad(mtr);
ut_ad(lock);
rw_lock_s_lock_func(lock, 0, file, line);
mtr_memo_push(mtr, lock, MTR_MEMO_S_LOCK);
}
/*************************************************************************
Locks a lock in x-mode. */
UNIV_INLINE
void
mtr_x_lock_func(
/*============*/
rw_lock_t* lock, /* in: rw-lock */
const char* file, /* in: file name */
ulint line, /* in: line number */
mtr_t* mtr) /* in: mtr */
{
ut_ad(mtr);
ut_ad(lock);
rw_lock_x_lock_func(lock, 0, file, line);
mtr_memo_push(mtr, lock, MTR_MEMO_X_LOCK);
}
|