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shl: hook: add helpers to add callbacks only once

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Very often we want to avoid adding callbacks multiple times. Currently we
have to keep track of this in each module with a boolean value.
To simplify this procedure, we add helpers that guarantee that entries are
only added once and a helper to remove all entries with a given cb+data
combination.

Signed-off-by: David Herrmann <dh.herrmann@googlemail.com>
This commit is contained in:
David Herrmann 2013-01-13 11:23:05 +01:00
parent 041baf4c40
commit 8fa28926cb
1 changed files with 40 additions and 0 deletions
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40
src/shl_hook.h
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@ -129,6 +129,24 @@ static inline int shl_hook_add(struct shl_hook *hook, shl_hook_cb cb,
return 0;
}
static inline int shl_hook_add_single(struct shl_hook *hook, shl_hook_cb cb,
void *data)
{
struct shl_hook_entry *entry;
struct shl_dlist *iter;
if (!hook || !cb)
return -EINVAL;
shl_dlist_for_each(iter, &hook->entries) {
entry = shl_dlist_entry(iter, struct shl_hook_entry, list);
if (entry->cb == cb && entry->data == data)
return 0;
}
return shl_hook_add(hook, cb, data);
}
static inline void shl_hook_rm(struct shl_hook *hook, shl_hook_cb cb,
void *data)
{
@ -152,6 +170,28 @@ static inline void shl_hook_rm(struct shl_hook *hook, shl_hook_cb cb,
}
}
static inline void shl_hook_rm_all(struct shl_hook *hook, shl_hook_cb cb,
void *data)
{
struct shl_dlist *iter, *tmp;
struct shl_hook_entry *entry;
if (!hook || !cb)
return;
shl_dlist_for_each_reverse_safe(iter, tmp, &hook->entries) {
entry = shl_dlist_entry(iter, struct shl_hook_entry, list);
if (entry->cb == cb && entry->data == data) {
/* if *_call() is running we must not disturb it */
if (hook->cur_entry == iter)
hook->cur_entry = iter->next;
shl_dlist_unlink(&entry->list);
free(entry);
hook->num--;
}
}
}
static inline void shl_hook_call(struct shl_hook *hook, void *parent,
void *arg)
{