51 lines
968 B
C
51 lines
968 B
C
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#include "cache.h"
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#include "mru.h"
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void mru_append(struct mru *mru, void *item)
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{
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struct mru_entry *cur = xmalloc(sizeof(*cur));
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cur->item = item;
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cur->prev = mru->tail;
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cur->next = NULL;
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if (mru->tail)
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mru->tail->next = cur;
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else
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mru->head = cur;
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mru->tail = cur;
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}
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void mru_mark(struct mru *mru, struct mru_entry *entry)
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{
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/* If we're already at the front of the list, nothing to do */
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if (mru->head == entry)
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return;
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/* Otherwise, remove us from our current slot... */
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if (entry->prev)
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entry->prev->next = entry->next;
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if (entry->next)
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entry->next->prev = entry->prev;
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else
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mru->tail = entry->prev;
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/* And insert us at the beginning. */
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entry->prev = NULL;
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entry->next = mru->head;
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if (mru->head)
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mru->head->prev = entry;
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mru->head = entry;
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}
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void mru_clear(struct mru *mru)
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{
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struct mru_entry *p = mru->head;
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while (p) {
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struct mru_entry *to_free = p;
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p = p->next;
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free(to_free);
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}
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mru->head = mru->tail = NULL;
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}
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