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74971473 JG |
1 | /* |
2 | * This file is part of the PCEPlib, a PCEP protocol library. | |
3 | * | |
4 | * Copyright (C) 2020 Volta Networks https://voltanet.io/ | |
5 | * | |
6 | * This library is free software; you can redistribute it and/or | |
7 | * modify it under the terms of the GNU Lesser General Public | |
8 | * License as published by the Free Software Foundation; either | |
9 | * version 2 of the License, or (at your option) any later version. | |
10 | * | |
11 | * This library 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 GNU | |
14 | * Lesser General Public License for more details. | |
15 | * | |
16 | * You should have received a copy of the GNU Lesser General Public License | |
17 | * along with this program. If not, see <https://www.gnu.org/licenses/>. | |
18 | * | |
19 | * Author : Brady Johnson <brady@voltanet.io> | |
20 | * | |
21 | */ | |
22 | ||
23 | ||
1f8031f7 DL |
24 | #ifdef HAVE_CONFIG_H |
25 | #include "config.h" | |
26 | #endif | |
27 | ||
74971473 JG |
28 | #include <stdbool.h> |
29 | #include <stdio.h> | |
30 | #include <string.h> | |
31 | ||
32 | #include "pcep_utils_logging.h" | |
33 | #include "pcep_utils_memory.h" | |
34 | #include "pcep_utils_queue.h" | |
35 | ||
2816045a | 36 | queue_handle *queue_initialize(void) |
74971473 JG |
37 | { |
38 | /* Set the max_entries to 0 to disable it */ | |
39 | return queue_initialize_with_size(0); | |
40 | } | |
41 | ||
42 | ||
43 | queue_handle *queue_initialize_with_size(unsigned int max_entries) | |
44 | { | |
45 | queue_handle *handle = | |
46 | pceplib_malloc(PCEPLIB_INFRA, sizeof(queue_handle)); | |
47 | memset(handle, 0, sizeof(queue_handle)); | |
48 | handle->max_entries = max_entries; | |
49 | ||
50 | return handle; | |
51 | } | |
52 | ||
53 | ||
54 | void queue_destroy(queue_handle *handle) | |
55 | { | |
56 | if (handle == NULL) { | |
57 | pcep_log( | |
58 | LOG_DEBUG, | |
59 | "%s: queue_destroy, the queue has not been initialized", | |
60 | __func__); | |
61 | return; | |
62 | } | |
63 | ||
64 | while (queue_dequeue(handle) != NULL) { | |
65 | } | |
66 | pceplib_free(PCEPLIB_INFRA, handle); | |
67 | } | |
68 | ||
69 | ||
70 | void queue_destroy_with_data(queue_handle *handle) | |
71 | { | |
72 | if (handle == NULL) { | |
73 | pcep_log( | |
74 | LOG_DEBUG, | |
75 | "%s: queue_destroy_with_data, the queue has not been initialized", | |
76 | __func__); | |
77 | return; | |
78 | } | |
79 | ||
80 | void *data = queue_dequeue(handle); | |
81 | while (data != NULL) { | |
82 | pceplib_free(PCEPLIB_INFRA, data); | |
83 | data = queue_dequeue(handle); | |
84 | } | |
85 | pceplib_free(PCEPLIB_INFRA, handle); | |
86 | } | |
87 | ||
88 | ||
89 | queue_node *queue_enqueue(queue_handle *handle, void *data) | |
90 | { | |
91 | if (handle == NULL) { | |
92 | pcep_log( | |
93 | LOG_DEBUG, | |
94 | "%s: queue_enqueue, the queue has not been initialized", | |
95 | __func__); | |
96 | return NULL; | |
97 | } | |
98 | ||
99 | if (handle->max_entries > 0 | |
100 | && handle->num_entries >= handle->max_entries) { | |
101 | pcep_log( | |
102 | LOG_DEBUG, | |
103 | "%s: queue_enqueue, cannot enqueue: max entries hit [%u]", | |
104 | handle->num_entries); | |
105 | return NULL; | |
106 | } | |
107 | ||
108 | queue_node *new_node = | |
109 | pceplib_malloc(PCEPLIB_INFRA, sizeof(queue_node)); | |
110 | memset(new_node, 0, sizeof(queue_node)); | |
111 | new_node->data = data; | |
112 | new_node->next_node = NULL; | |
113 | ||
114 | (handle->num_entries)++; | |
115 | if (handle->head == NULL) { | |
116 | /* its the first entry in the queue */ | |
117 | handle->head = handle->tail = new_node; | |
118 | } else { | |
119 | handle->tail->next_node = new_node; | |
120 | handle->tail = new_node; | |
121 | } | |
122 | ||
123 | return new_node; | |
124 | } | |
125 | ||
126 | ||
127 | void *queue_dequeue(queue_handle *handle) | |
128 | { | |
129 | if (handle == NULL) { | |
130 | pcep_log( | |
131 | LOG_DEBUG, | |
132 | "%s: queue_dequeue, the queue has not been initialized", | |
133 | __func__); | |
134 | return NULL; | |
135 | } | |
136 | ||
137 | if (handle->head == NULL) { | |
138 | return NULL; | |
139 | } | |
140 | ||
141 | void *node_data = handle->head->data; | |
142 | queue_node *node = handle->head; | |
143 | (handle->num_entries)--; | |
144 | if (handle->head == handle->tail) { | |
145 | /* its the last entry in the queue */ | |
146 | handle->head = handle->tail = NULL; | |
147 | } else { | |
148 | handle->head = node->next_node; | |
149 | } | |
150 | ||
151 | pceplib_free(PCEPLIB_INFRA, node); | |
152 | ||
153 | return node_data; | |
154 | } |