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8cad15b1 VSO |
1 | /* |
2 | * Simple transactions API | |
3 | * | |
4 | * Copyright (c) 2021 Virtuozzo International GmbH. | |
5 | * | |
6 | * Author: | |
7 | * Sementsov-Ogievskiy Vladimir <vsementsov@virtuozzo.com> | |
8 | * | |
9 | * This program is free software; you can redistribute it and/or modify | |
10 | * it under the terms of the GNU General Public License as published by | |
11 | * the Free Software Foundation; either version 2 of the License, or | |
12 | * (at your option) any later version. | |
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 for more details. | |
18 | * | |
19 | * You should have received a copy of the GNU General Public License | |
20 | * along with this program. If not, see <http://www.gnu.org/licenses/>. | |
21 | */ | |
22 | ||
23 | #include "qemu/osdep.h" | |
24 | ||
25 | #include "qemu/transactions.h" | |
26 | #include "qemu/queue.h" | |
27 | ||
28 | typedef struct TransactionAction { | |
29 | TransactionActionDrv *drv; | |
30 | void *opaque; | |
31 | QSLIST_ENTRY(TransactionAction) entry; | |
32 | } TransactionAction; | |
33 | ||
34 | struct Transaction { | |
35 | QSLIST_HEAD(, TransactionAction) actions; | |
36 | }; | |
37 | ||
38 | Transaction *tran_new(void) | |
39 | { | |
40 | Transaction *tran = g_new(Transaction, 1); | |
41 | ||
42 | QSLIST_INIT(&tran->actions); | |
43 | ||
44 | return tran; | |
45 | } | |
46 | ||
47 | void tran_add(Transaction *tran, TransactionActionDrv *drv, void *opaque) | |
48 | { | |
49 | TransactionAction *act; | |
50 | ||
51 | act = g_new(TransactionAction, 1); | |
52 | *act = (TransactionAction) { | |
53 | .drv = drv, | |
54 | .opaque = opaque | |
55 | }; | |
56 | ||
57 | QSLIST_INSERT_HEAD(&tran->actions, act, entry); | |
58 | } | |
59 | ||
60 | void tran_abort(Transaction *tran) | |
61 | { | |
62 | TransactionAction *act, *next; | |
63 | ||
079bff69 | 64 | QSLIST_FOREACH(act, &tran->actions, entry) { |
8cad15b1 VSO |
65 | if (act->drv->abort) { |
66 | act->drv->abort(act->opaque); | |
67 | } | |
079bff69 | 68 | } |
8cad15b1 | 69 | |
079bff69 | 70 | QSLIST_FOREACH_SAFE(act, &tran->actions, entry, next) { |
8cad15b1 VSO |
71 | if (act->drv->clean) { |
72 | act->drv->clean(act->opaque); | |
73 | } | |
74 | ||
75 | g_free(act); | |
76 | } | |
77 | ||
78 | g_free(tran); | |
79 | } | |
80 | ||
81 | void tran_commit(Transaction *tran) | |
82 | { | |
83 | TransactionAction *act, *next; | |
84 | ||
079bff69 | 85 | QSLIST_FOREACH(act, &tran->actions, entry) { |
8cad15b1 VSO |
86 | if (act->drv->commit) { |
87 | act->drv->commit(act->opaque); | |
88 | } | |
079bff69 | 89 | } |
8cad15b1 | 90 | |
079bff69 | 91 | QSLIST_FOREACH_SAFE(act, &tran->actions, entry, next) { |
8cad15b1 VSO |
92 | if (act->drv->clean) { |
93 | act->drv->clean(act->opaque); | |
94 | } | |
95 | ||
96 | g_free(act); | |
97 | } | |
98 | ||
99 | g_free(tran); | |
100 | } |