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/* Author : Stephen Smalley, <sds@tycho.nsa.gov> */
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/* FLASK */
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/*
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* A double-ended queue is a singly linked list of
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* elements of arbitrary type that may be accessed
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* at either end.
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*/
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#ifndef _QUEUE_H_
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#define _QUEUE_H_
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typedef void *queue_element_t;
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typedef struct queue_node *queue_node_ptr_t;
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typedef struct queue_node {
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queue_element_t element;
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queue_node_ptr_t next;
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} queue_node_t;
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typedef struct queue_info {
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queue_node_ptr_t head;
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queue_node_ptr_t tail;
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} queue_info_t;
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typedef queue_info_t *queue_t;
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queue_t queue_create(void);
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int queue_insert(queue_t, queue_element_t);
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int queue_push(queue_t, queue_element_t);
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queue_element_t queue_remove(queue_t);
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queue_element_t queue_head(queue_t);
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void queue_destroy(queue_t);
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/*
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Applies the specified function f to each element in the
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specified queue.
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In addition to passing the element to f, queue_map
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passes the specified void* pointer to f on each invocation.
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If f returns a non-zero status, then queue_map will cease
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iterating through the hash table and will propagate the error
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return to its caller.
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*/
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int queue_map(queue_t, int (*f) (queue_element_t, void *), void *);
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/*
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Same as queue_map, except that if f returns a non-zero status,
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then the element will be removed from the queue and the g
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function will be applied to the element.
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*/
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void queue_map_remove_on_error(queue_t,
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int (*f) (queue_element_t, void *),
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void (*g) (queue_element_t, void *), void *);
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#endif
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/* FLASK */
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