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[client] ll: add new method ll_peek_tail

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This commit is contained in:
Geoffrey McRae 2021-01-06 22:11:10 +11:00
parent 67022d664f
commit 271276a0a9
2 changed files with 20 additions and 2 deletions
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3
client/include/ll.h
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@ -25,7 +25,8 @@ void ll_free (struct ll * list);
void ll_push (struct ll * list, void * data); void ll_push (struct ll * list, void * data);
bool ll_shift (struct ll * list, void ** data); bool ll_shift (struct ll * list, void ** data);
bool ll_peek_head(struct ll * list, void ** data); bool ll_peek_head(struct ll * list, void ** data);
bool ll_peek_tail(struct ll * list, void ** data);
unsigned int ll_count (struct ll * list); unsigned int ll_count (struct ll * list);
void ll_reset (struct ll * list); void ll_reset (struct ll * list);
bool ll_walk (struct ll * list, void ** data); bool ll_walk (struct ll * list, void ** data);

19
client/src/ll.c
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@ -92,8 +92,10 @@ bool ll_shift(struct ll * list, void ** data)
--list->count; --list->count;
struct ll_item * item = list->head; struct ll_item * item = list->head;
list->head = item->next; list->head = item->next;
list->pos = NULL;
if (list->tail == item)
list->tail = NULL;
list->pos = NULL;
LG_UNLOCK(list->lock); LG_UNLOCK(list->lock);
if (data) if (data)
@ -118,6 +120,21 @@ bool ll_peek_head(struct ll * list, void ** data)
return true; return true;
} }
bool ll_peek_tail(struct ll * list, void ** data)
{
LG_LOCK(list->lock);
if (!list->tail)
{
LG_UNLOCK(list->lock);
return false;
}
*data = list->tail->data;
LG_UNLOCK(list->lock);
return true;
}
unsigned int ll_count(struct ll * list) unsigned int ll_count(struct ll * list)
{ {
return list->count; return list->count;