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hrtimer: insert must handle head tail pointers

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This commit is contained in:
Andy Green 2019-03-21 18:53:59 +08:00
parent d5d2bbc4db
commit 303c78a5dd
1 changed files with 15 additions and 2 deletions
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17
lib/core/libwebsockets.c
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@ -152,7 +152,7 @@ lws_dll_insert(struct lws_dll *n, struct lws_dll *target,
if (before) {
/*
* we go before dd
* DDp <-> DD <-> DDn --> DDp <-> us <-> DD <-> DDn
* DDp <-> DD <-> DDn --> DDp <-> us <-> DD <-> DDn
*/
/* we point forward to dd */
n->next = target;
@ -163,10 +163,17 @@ lws_dll_insert(struct lws_dll *n, struct lws_dll *target,
target->prev->next = n;
/* DD points back to us now */
target->prev = n;
/* if target was the head, we are now the head */
if (phead->next == target)
phead->next = n;
/* since we are before another guy, we cannot become the tail */
} else {
/*
* we go after dd
* DDp <-> DD <-> DDn --> DDp <-> DD <-> us <-> DDn
* DDp <-> DD <-> DDn --> DDp <-> DD <-> us <-> DDn
*/
/* we point forward to what dd used to point forward to */
n->next = target->next;
@ -177,6 +184,12 @@ lws_dll_insert(struct lws_dll *n, struct lws_dll *target,
target->next->prev = n;
/* DD points forward to us */
target->next = n;
/* if target was the tail, we are now the tail */
if (phead->prev == target)
phead->prev = n;
/* since we go after another guy, we cannot become the head */
}
}