/src/kamailio/src/core/locking.c
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1 | | /* |
2 | | * Copyright (C) 2016 kamailio.org |
3 | | * |
4 | | * This file is part of Kamailio, a free SIP server. |
5 | | * |
6 | | * Kamailio is free software; you can redistribute it and/or modify |
7 | | * it under the terms of the GNU General Public License as published by |
8 | | * the Free Software Foundation; either version 2 of the License, or |
9 | | * (at your option) any later version |
10 | | * |
11 | | * Kamailio is distributed in the hope that it will be useful, |
12 | | * but WITHOUT ANY WARRANTY; without even the implied warranty of |
13 | | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the |
14 | | * GNU General Public License for more details. |
15 | | * |
16 | | * You should have received a copy of the GNU General Public License |
17 | | * along with this program; if not, write to the Free Software |
18 | | * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA |
19 | | */ |
20 | | |
21 | | #include <stdlib.h> |
22 | | #include <string.h> |
23 | | |
24 | | #include "mem/shm.h" |
25 | | |
26 | | #include "locking.h" |
27 | | |
28 | | /** |
29 | | * |
30 | | */ |
31 | | rec_lock_t *rec_lock_alloc() |
32 | 0 | { |
33 | 0 | return shm_malloc(sizeof(rec_lock_t)); |
34 | 0 | } |
35 | | |
36 | | /** |
37 | | * |
38 | | */ |
39 | | rec_lock_t *rec_lock_init(rec_lock_t *rlock) |
40 | 0 | { |
41 | 0 | memset(rlock, 0, sizeof(rec_lock_t)); |
42 | 0 | if(lock_init(&rlock->lock) == 0) { |
43 | 0 | return NULL; |
44 | 0 | } |
45 | 0 | return rlock; |
46 | 0 | } |
47 | | |
48 | | /** |
49 | | * |
50 | | */ |
51 | | void rec_lock_destroy(rec_lock_t *rlock) |
52 | 0 | { |
53 | 0 | lock_destroy(&rlock->lock); |
54 | 0 | memset(rlock, 0, sizeof(rec_lock_t)); |
55 | 0 | } |
56 | | |
57 | | /** |
58 | | * |
59 | | */ |
60 | | void rec_lock_dealloc(rec_lock_t *rlock) |
61 | 0 | { |
62 | 0 | shm_free(rlock); |
63 | 0 | } |
64 | | |
65 | | /** |
66 | | * |
67 | | */ |
68 | | void rec_lock_get(rec_lock_t *rlock) |
69 | 0 | { |
70 | 0 | int mypid; |
71 | |
|
72 | 0 | mypid = my_pid(); |
73 | 0 | if(likely(atomic_get(&rlock->locker_pid) != mypid)) { |
74 | 0 | lock_get(&rlock->lock); |
75 | 0 | atomic_set(&rlock->locker_pid, mypid); |
76 | 0 | } else { |
77 | | /* locked within the same process that executed us */ |
78 | 0 | rlock->rec_lock_level++; |
79 | 0 | } |
80 | 0 | } |
81 | | |
82 | | /** |
83 | | * |
84 | | */ |
85 | | void rec_lock_release(rec_lock_t *rlock) |
86 | 0 | { |
87 | 0 | if(likely(rlock->rec_lock_level == 0)) { |
88 | 0 | atomic_set(&rlock->locker_pid, 0); |
89 | 0 | lock_release(&rlock->lock); |
90 | 0 | } else { |
91 | | /* recursive locked => decrease lock count */ |
92 | 0 | rlock->rec_lock_level--; |
93 | 0 | } |
94 | 0 | } |
95 | | |
96 | | /** |
97 | | * |
98 | | */ |
99 | | rec_lock_set_t *rec_lock_set_alloc(int n) |
100 | 0 | { |
101 | 0 | rec_lock_set_t *ls; |
102 | 0 | ls = (rec_lock_set_t *)shm_malloc( |
103 | 0 | sizeof(rec_lock_set_t) + n * sizeof(rec_lock_t)); |
104 | 0 | if(ls == 0) { |
105 | 0 | SHM_MEM_CRITICAL; |
106 | 0 | } else { |
107 | 0 | ls->locks = (rec_lock_t *)((char *)ls + sizeof(rec_lock_set_t)); |
108 | 0 | ls->size = n; |
109 | 0 | } |
110 | 0 | return ls; |
111 | 0 | } |
112 | | |
113 | | /** |
114 | | * |
115 | | */ |
116 | | rec_lock_set_t *rec_lock_set_init(rec_lock_set_t *lset) |
117 | 0 | { |
118 | 0 | int r; |
119 | 0 | for(r = 0; r < lset->size; r++) |
120 | 0 | if(rec_lock_init(&lset->locks[r]) == 0) |
121 | 0 | return 0; |
122 | 0 | return lset; |
123 | 0 | } |
124 | | |
125 | | /** |
126 | | * |
127 | | */ |
128 | | void rec_lock_set_destroy(rec_lock_set_t *lset) |
129 | 0 | { |
130 | 0 | return; |
131 | 0 | } |
132 | | |
133 | | /** |
134 | | * |
135 | | */ |
136 | | void rec_lock_set_dealloc(rec_lock_set_t *lset) |
137 | 0 | { |
138 | 0 | shm_free((void *)lset); |
139 | 0 | return; |
140 | 0 | } |
141 | | |
142 | | /** |
143 | | * |
144 | | */ |
145 | | void rec_lock_set_get(rec_lock_set_t *lset, int i) |
146 | 0 | { |
147 | 0 | rec_lock_get(&lset->locks[i]); |
148 | 0 | return; |
149 | 0 | } |
150 | | |
151 | | /** |
152 | | * |
153 | | */ |
154 | | void rec_lock_set_release(rec_lock_set_t *lset, int i) |
155 | 0 | { |
156 | 0 | rec_lock_release(&lset->locks[i]); |
157 | 0 | return; |
158 | 0 | } |