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docs: lws_dll and lws_dll2 documentation 3
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READMEs/README.lws_dll.md
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READMEs/README.lws_dll.md
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# lws_dll Doubly-linked list
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## Introduction
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Lws supports two kinds of doubly-linked list, `lws_dll` and `lws_dll2`.
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Unless memory is at a big premium, or it has to work on lws < v3.2, it's
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best to simply use `lws_dll2`.
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## How to use
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The basics are the same for lws_dll and lws_dll2.
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The list objects point only to themselves, and you use the `lws_container_of`
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macro to get a pointer to your struct that contains the list object. Doing
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it this way
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- the list object does not have to be the first thing in your struct
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- your struct can contain multiple list objects and appear on lists belonging
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to multiple owners simultaenously,
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### lws_dll Minimal example
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```
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struct mystruct {
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....
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lws_dll list;
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...
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};
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lws_dll owner;
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```
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Adding a mystruct to the owner list (...add_tail() works the same way but adds
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to the other end of the list)
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```
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struct mystruct *p;
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...
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lws_dll_add_head(&p->list, &owner);
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```
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Removing the list object from its owner
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```
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lws_dll2_remove(&p->list, &owner);
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```
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If you have a `struct lws_dll *d` pointing to `list` in struct mystruct, you can
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convert it to a `struct mystruct *p` ike this
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```
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struct mystruct *p = lws_container_of(d, struct lws_dll, list);
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```
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### lws_dll2 Minimal example
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```
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struct mystruct {
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....
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lws_dll2 list;
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...
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};
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lws_dll2_owner owner;
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```
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Adding a mystruct to the owner list (...add_tail() works the same way but adds
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to the other end of the list)
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```
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struct mystruct *p;
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...
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lws_dll2_add_head(&p->list, &owner);
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```
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Removing the list object from its owner (notice compared to lws_dll, it doesn't
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need to be told the owner)
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```
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lws_dll2_remove(&p->list);
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```
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If you have a `struct lws_dll2 *d` pointing to `list` in struct mystruct, you
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can convert it to a `struct mystruct *p` ike this
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```
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struct mystruct *p = lws_container_of(d, struct lws_dll2, list);
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```
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## Summary Comparing lws_dll and lws_dll2
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- both offer a doubly-linked list object, and (since v3.2) track both the
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head and tail in an "list owner" object
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- both are initalized by memsetting to 0
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- for `lws_dll`, it reuses an `lws_dll` as the "owner", for `lws_dll2`, there's a
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specific `lws_dll2_owner` structure for that
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- `lws_dll2_owner` also keeps count of the number of list elements
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- `lws_dll2` knows which owner's list it is participating on. So it can remove
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itself and update the owner without the caller needing to know its owner.
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In the case there are several potential owners list objects may be on, this
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is very convenient.
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- `lws_dll` is simpler and has a smaller footprint (two pointers per entry vs
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three). But you have to know the exact list owner to perform operations on
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it.
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## apis
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|function|lws_dll|lws_dll2|
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|---|---|---|
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|add entry at head|`void lws_dll_add_head(struct lws_dll *d, struct lws_dll *phead)`|`void lws_dll2_add_head(struct lws_dll2 *d, struct lws_dll2_owner *owner)`|
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|add entry at tail|`void lws_dll_add_tail(struct lws_dll *d, struct lws_dll *phead);`|`void lws_dll2_add_tail(struct lws_dll2 *d, struct lws_dll2_owner *owner)`|
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|remove entry from its owning list|`void lws_dll_remove_track_tail(struct lws_dll *d, struct lws_dll *phead)`|`void lws_dll2_add_tail(struct lws_dll2 *d, struct lws_dll2_owner *owner)`|
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|get owner|(not supported)|`struct lws_dll2_owner * lws_dll2_owner(const struct lws_dll2 *d)`|
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|check if item is detached from any list|`lws_dll_is_detached(struct lws_dll *d, struct lws_dll *phead)|int lws_dll2_is_detached(const struct lws_dll2 *d)`|
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|iterate through items on list|`int lws_dll_foreach_safe(struct lws_dll *phead, void *user, int (*cb)(struct lws_dll *d, void *user))|int lws_dll2_foreach_safe(struct lws_dll2_owner *owner, void *user, int (*cb)(struct lws_dll2 *d, void *user))`|
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doc-assets/lws_dll.svg
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doc-assets/lws_dll.svg
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After Width: | Height: | Size: 27 KiB |
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Add table
Reference in a new issue