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1 | /* |
2 | * Copyright (c) 2008, 2009 Nicira Networks. | |
3 | * | |
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4 | * Licensed under the Apache License, Version 2.0 (the "License"); |
5 | * you may not use this file except in compliance with the License. | |
6 | * You may obtain a copy of the License at: | |
064af421 | 7 | * |
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8 | * http://www.apache.org/licenses/LICENSE-2.0 |
9 | * | |
10 | * Unless required by applicable law or agreed to in writing, software | |
11 | * distributed under the License is distributed on an "AS IS" BASIS, | |
12 | * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. | |
13 | * See the License for the specific language governing permissions and | |
14 | * limitations under the License. | |
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15 | */ |
16 | ||
17 | #ifndef QUEUE_H | |
18 | #define QUEUE_H 1 | |
19 | ||
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20 | #include <stdbool.h> |
21 | ||
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22 | /* Packet queue. */ |
23 | struct ovs_queue { | |
24 | int n; /* Number of queued packets. */ | |
25 | struct ofpbuf *head; /* First queued packet, null if n == 0. */ | |
26 | struct ofpbuf *tail; /* Last queued packet, null if n == 0. */ | |
27 | }; | |
28 | ||
29 | void queue_init(struct ovs_queue *); | |
30 | void queue_destroy(struct ovs_queue *); | |
31 | void queue_clear(struct ovs_queue *); | |
32 | void queue_advance_head(struct ovs_queue *, struct ofpbuf *next); | |
33 | void queue_push_tail(struct ovs_queue *, struct ofpbuf *); | |
34 | struct ofpbuf *queue_pop_head(struct ovs_queue *); | |
35 | ||
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36 | static inline bool queue_is_empty(const struct ovs_queue *q) |
37 | { | |
38 | return q->n == 0; | |
39 | } | |
40 | ||
064af421 | 41 | #endif /* queue.h */ |