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71 wiersze
1.9 KiB
71 wiersze
1.9 KiB
#ifndef _FIFO_H
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#define _FIFO_H
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/* Main FIFO structure. Allocate memory for it yourself. */
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typedef struct fifo_t {
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void *head;
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void *tail;
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unsigned long long count;
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} fifo_t;
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typedef struct fifo_handle_t {
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void *next;
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} fifo_handle_t;
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/* Initializes fifo structure. */
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#define fifo_init(fifo) \
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do { \
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fifo_t *__q = fifo; \
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__q->head = NULL; \
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__q->tail = NULL; \
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__q->count = 0; \
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} while (0)
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#define __fifo_push(fifo, p, h) \
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do { \
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fifo_t *__q = fifo; \
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__typeof__ (p) e = p; \
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e->h.next = NULL; \
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if (__q->tail == NULL) { \
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__q->head = e; \
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} else { \
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__typeof__ (e) t = __q->tail; \
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t->h.next = e; \
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} \
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__q->tail = e; \
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__q->count++; \
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} while (0)
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/* Puts an element to the queue. */
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#define fifo_push(fifo, p) __fifo_push (fifo, p, fifo_handle)
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#define __fifo_pop(fifo, p, h) \
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do { \
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fifo_t *__q = fifo; \
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p = __q->head; \
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if (p != NULL) { \
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__q->count--; \
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__q->head = p->h.next; \
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if (__q->tail == p) \
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__q->tail = NULL; \
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} \
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} while (0)
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/* Pops the first element out of the queue. */
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#define fifo_pop(fifo, p) __fifo_pop (fifo, p, fifo_handle)
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#define __fifo_peak(fifo, p, h) \
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do { \
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p = (fifo)->head; \
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} while (0)
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/* Returns the first elemnt of the queue without removing. */
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#define fifo_peak(fifo, p) __fifo_peak (fifo, p, fifo_handle)
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/* Returns the length of the queue. */
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#define fifo_length(fifo) ((fifo)->count)
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/* Returns true if the queue is empty. */
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#define fifo_empty(fifo) ((fifo)->count == 0)
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#endif /* _FIFO_H */
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