You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
45 lines
1.6 KiB
45 lines
1.6 KiB
#ifndef PRIORITY_QUEUE_H
|
|
#define PRIORITY_QUEUE_H
|
|
|
|
#include <spinlock/fas.h>
|
|
|
|
#define MAX 4096
|
|
|
|
/**
|
|
* How to get the priority out of the generic element
|
|
* We assume priority is expressed as an unsigned 64-bit integer (i.e. cycles or
|
|
* UNIX time in ms). This is used to maintain a read replica of the highest
|
|
* priority element that can be used to maintain a read replica
|
|
* @param element
|
|
* @returns priority (a u64)
|
|
*/
|
|
typedef uint64_t (*priority_queue_get_priority_fn_t)(void *element);
|
|
|
|
/* We assume that priority is expressed in terms of a 64 bit unsigned integral */
|
|
struct priority_queue {
|
|
ck_spinlock_fas_t lock;
|
|
uint64_t highest_priority;
|
|
void * items[MAX];
|
|
int first_free;
|
|
priority_queue_get_priority_fn_t get_priority_fn;
|
|
};
|
|
|
|
/**
|
|
* Checks if a priority queue is empty
|
|
* @param self the priority queue to check
|
|
* @returns true if empty, else otherwise
|
|
*/
|
|
static inline bool
|
|
priority_queue_is_empty(struct priority_queue *self)
|
|
{
|
|
return self->highest_priority == ULONG_MAX;
|
|
}
|
|
|
|
void priority_queue_initialize(struct priority_queue *self, priority_queue_get_priority_fn_t get_priority_fn);
|
|
int priority_queue_enqueue(struct priority_queue *self, void *value);
|
|
int priority_queue_dequeue(struct priority_queue *self, void **dequeued_element);
|
|
int priority_queue_length(struct priority_queue *self);
|
|
uint64_t priority_queue_peek(struct priority_queue *self);
|
|
int priority_queue_delete(struct priority_queue *self, void *value);
|
|
|
|
#endif /* PRIORITY_QUEUE_H */ |