|
1
by brian
clean slate |
1 |
/******************************************************
|
2 |
The transaction
|
|
3 |
||
4 |
(c) 1996 Innobase Oy
|
|
5 |
||
6 |
Created 3/26/1996 Heikki Tuuri
|
|
7 |
*******************************************************/
|
|
8 |
||
9 |
/*****************************************************************
|
|
10 |
Starts the transaction if it is not yet started. */
|
|
11 |
UNIV_INLINE |
|
12 |
void |
|
13 |
trx_start_if_not_started(
|
|
14 |
/*=====================*/
|
|
15 |
trx_t* trx) /* in: transaction */ |
|
16 |
{
|
|
17 |
ut_ad(trx->conc_state != TRX_COMMITTED_IN_MEMORY); |
|
18 |
||
19 |
if (trx->conc_state == TRX_NOT_STARTED) { |
|
20 |
||
21 |
trx_start(trx, ULINT_UNDEFINED); |
|
22 |
} |
|
23 |
}
|
|
24 |
||
25 |
/*****************************************************************
|
|
26 |
Starts the transaction if it is not yet started. Assumes we have reserved
|
|
27 |
the kernel mutex! */
|
|
28 |
UNIV_INLINE |
|
29 |
void |
|
30 |
trx_start_if_not_started_low(
|
|
31 |
/*=========================*/
|
|
32 |
trx_t* trx) /* in: transaction */ |
|
33 |
{
|
|
34 |
ut_ad(trx->conc_state != TRX_COMMITTED_IN_MEMORY); |
|
35 |
||
36 |
if (trx->conc_state == TRX_NOT_STARTED) { |
|
37 |
||
38 |
trx_start_low(trx, ULINT_UNDEFINED); |
|
39 |
} |
|
40 |
}
|
|
41 |
||
42 |
/*****************************************************************
|
|
43 |
Resets the new record lock info in a transaction struct. */
|
|
44 |
UNIV_INLINE |
|
45 |
void |
|
46 |
trx_reset_new_rec_lock_info(
|
|
47 |
/*========================*/
|
|
48 |
trx_t* trx) /* in: transaction struct */ |
|
49 |
{
|
|
50 |
trx->new_rec_locks[0] = NULL; |
|
51 |
trx->new_rec_locks[1] = NULL; |
|
52 |
}
|
|
53 |
||
54 |
/*****************************************************************
|
|
55 |
Registers that we have set a new record lock on an index. We only have space
|
|
56 |
to store 2 indexes! If this is called to store more than 2 indexes after
|
|
57 |
trx_reset_new_rec_lock_info(), then this function does nothing. */
|
|
58 |
UNIV_INLINE |
|
59 |
void |
|
60 |
trx_register_new_rec_lock(
|
|
61 |
/*======================*/
|
|
62 |
trx_t* trx, /* in: transaction struct */ |
|
63 |
dict_index_t* index) /* in: trx sets a new record lock on this |
|
64 |
index */
|
|
65 |
{
|
|
66 |
if (trx->new_rec_locks[0] == NULL) { |
|
67 |
trx->new_rec_locks[0] = index; |
|
68 |
||
69 |
return; |
|
70 |
} |
|
71 |
||
72 |
if (trx->new_rec_locks[0] == index) { |
|
73 |
||
74 |
return; |
|
75 |
} |
|
76 |
||
77 |
if (trx->new_rec_locks[1] != NULL) { |
|
78 |
||
79 |
return; |
|
80 |
} |
|
81 |
||
82 |
trx->new_rec_locks[1] = index; |
|
83 |
}
|
|
84 |
||
85 |
/*****************************************************************
|
|
86 |
Checks if trx has set a new record lock on an index. */
|
|
87 |
UNIV_INLINE |
|
88 |
ibool |
|
89 |
trx_new_rec_locks_contain(
|
|
90 |
/*======================*/
|
|
91 |
/* out: TRUE if trx has set a new record lock |
|
92 |
on index */
|
|
93 |
trx_t* trx, /* in: transaction struct */ |
|
94 |
dict_index_t* index) /* in: index */ |
|
95 |
{
|
|
96 |
return(trx->new_rec_locks[0] == index |
|
97 |
|| trx->new_rec_locks[1] == index); |
|
98 |
}
|