65 lines
1.5 KiB
C
65 lines
1.5 KiB
C
#ifndef QUEUE_H_
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#define QUEUE_H_
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#include <stdbool.h>
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#include <stdlib.h>
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#include "internal.h"
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typedef struct queue_node queue_node_t;
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typedef struct queue_node {
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queue_node_t* prev;
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queue_node_t* next;
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} queue_node_t;
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typedef struct queue {
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queue_node_t head;
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} queue_t;
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EPOLL_INTERNAL inline void queue_node_init(queue_node_t* node) {
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node->prev = node;
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node->next = node;
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}
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EPOLL_INTERNAL inline void queue_init(queue_t* queue) {
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queue_node_init(&queue->head);
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}
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EPOLL_INTERNAL inline bool queue_enqueued(const queue_node_t* node) {
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return node->prev != node;
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}
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EPOLL_INTERNAL inline bool queue_empty(const queue_t* queue) {
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return !queue_enqueued(&queue->head);
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}
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EPOLL_INTERNAL inline queue_node_t* queue_first(const queue_t* queue) {
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return !queue_empty(queue) ? queue->head.next : NULL;
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}
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EPOLL_INTERNAL inline queue_node_t* queue_last(const queue_t* queue) {
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return !queue_empty(queue) ? queue->head.prev : NULL;
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}
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EPOLL_INTERNAL inline void queue_prepend(queue_t* queue, queue_node_t* node) {
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node->next = queue->head.next;
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node->prev = &queue->head;
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node->next->prev = node;
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queue->head.next = node;
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}
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EPOLL_INTERNAL inline void queue_append(queue_t* queue, queue_node_t* node) {
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node->next = &queue->head;
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node->prev = queue->head.prev;
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node->prev->next = node;
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queue->head.prev = node;
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}
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EPOLL_INTERNAL inline void queue_remove(queue_node_t* node) {
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node->prev->next = node->next;
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node->next->prev = node->prev;
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node->prev = node;
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node->next = node;
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}
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#endif /* QUEUE_H_ */
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