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34 lines
1.3 KiB
34 lines
1.3 KiB
#ifndef PRIORITY_QUEUE_H
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#define PRIORITY_QUEUE_H
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#include <spinlock/fas.h>
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#define MAX 4096
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/**
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* How to get the priority out of the generic element
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* We assume priority is expressed as an unsigned 64-bit integer (i.e. cycles or
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* UNIX time in ms). This is used to maintain a read replica of the highest
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* priority element that can be used to maintain a read replica
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* @param element
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* @returns priority (a u64)
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*/
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typedef uint64_t (*priority_queue_get_priority_fn_t)(void *element);
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/* We assume that priority is expressed in terms of a 64 bit unsigned integral */
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struct priority_queue {
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ck_spinlock_fas_t lock;
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uint64_t highest_priority;
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void * items[MAX];
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int first_free;
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priority_queue_get_priority_fn_t get_priority_fn;
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};
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void priority_queue_initialize(struct priority_queue *self, priority_queue_get_priority_fn_t get_priority_fn);
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int priority_queue_enqueue(struct priority_queue *self, void *value, char *name);
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void * priority_queue_dequeue(struct priority_queue *self, char *name);
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int priority_queue_length(struct priority_queue *self);
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uint64_t priority_queue_peek(struct priority_queue *self);
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int priority_queue_delete(struct priority_queue *self, void *value, char *name);
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#endif /* PRIORITY_QUEUE_H */ |