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
|
/*****************************************************************************
Copyright (c) 1997, 2012, Oracle and/or its affiliates. All Rights Reserved.
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 Street, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/read0read.ic
Cursor read
Created 2/16/1997 Heikki Tuuri
*******************************************************/
#include "trx0sys.h"
#ifdef UNIV_DEBUG
/*********************************************************************//**
Validates a read view object. */
static
bool
read_view_validate(
/*===============*/
const read_view_t* view) /*!< in: view to validate */
{
ut_ad(mutex_own(&trx_sys->mutex));
ut_ad(view->max_descr >= view->n_descr);
ut_ad(view->descriptors == NULL || view->max_descr > 0);
/* Check that the view->descriptors array is in ascending order. */
for (ulint i = 1; i < view->n_descr; ++i) {
ut_a(view->descriptors[i] > view->descriptors[i - 1]);
}
return(true);
}
/** Functor to validate the view list. */
struct ViewCheck {
ViewCheck() : m_prev_view(0) { }
void operator()(const read_view_t* view)
{
ut_a(m_prev_view == NULL
|| m_prev_view->low_limit_no >= view->low_limit_no);
m_prev_view = view;
}
const read_view_t* m_prev_view;
};
/*********************************************************************//**
Validates a read view list. */
static
bool
read_view_list_validate(void)
/*=========================*/
{
ut_ad(mutex_own(&trx_sys->mutex));
ut_list_map(trx_sys->view_list, &read_view_t::view_list, ViewCheck());
return(true);
}
#endif /* UNIV_DEBUG */
/*********************************************************************//**
Checks if a read view sees the specified transaction.
@return true if sees */
UNIV_INLINE
bool
read_view_sees_trx_id(
/*==================*/
const read_view_t* view, /*!< in: read view */
trx_id_t trx_id) /*!< in: trx id */
{
if (trx_id < view->up_limit_id) {
return(true);
} else if (trx_id >= view->low_limit_id) {
return(false);
}
/* Do a binary search over this view's descriptors array */
return(trx_find_descriptor(view->descriptors, view->n_descr,
trx_id) == NULL);
}
/*********************************************************************//**
Remove a read view from the trx_sys->view_list. */
UNIV_INLINE
void
read_view_remove(
/*=============*/
read_view_t* view, /*!< in: read view, can be 0 */
bool own_mutex) /*!< in: true if caller owns the
trx_sys_t::mutex */
{
if (view != 0) {
if (!own_mutex) {
mutex_enter(&trx_sys->mutex);
}
ut_ad(read_view_validate(view));
UT_LIST_REMOVE(view_list, trx_sys->view_list, view);
ut_ad(read_view_list_validate());
if (!own_mutex) {
mutex_exit(&trx_sys->mutex);
}
}
}
|
