[Date Prev][Date Next][Thread Prev][Thread Next][Date Index][Thread Index] [PATCH v4 03/19] tools/xenstore: add hashtable_replace() function
For an effective way to replace a hashtable entry add a new function hashtable_replace(). This is in preparation to replace TDB with a more simple data storage. Signed-off-by: Juergen Gross <jgross@xxxxxxxx> Acked-by: Julien Grall <jgrall@xxxxxxxxxx> --- V3: - fix commit message (Julien Grall) - move unrelated change to previous patch (Julien Grall) - make value parameter const V4: - remove "const" from value parameter again (Julien Grall) --- tools/xenstore/hashtable.c | 19 +++++++++++++++++++ tools/xenstore/hashtable.h | 16 ++++++++++++++++ 2 files changed, 35 insertions(+) diff --git a/tools/xenstore/hashtable.c b/tools/xenstore/hashtable.c index 88e14c4c57..0c26a09567 100644 --- a/tools/xenstore/hashtable.c +++ b/tools/xenstore/hashtable.c @@ -205,6 +205,25 @@ void *hashtable_search(const struct hashtable *h, const void *k) return e ? e->v : NULL; } +int hashtable_replace(struct hashtable *h, const void *k, void *v) +{ + struct entry *e; + + e = hashtable_search_entry(h, k); + if (!e) + return ENOENT; + + if (h->flags & HASHTABLE_FREE_VALUE) + { + talloc_free(e->v); + talloc_steal(e, v); + } + + e->v = v; + + return 0; +} + void hashtable_remove(struct hashtable *h, const void *k) { diff --git a/tools/xenstore/hashtable.h b/tools/xenstore/hashtable.h index e208d439a2..336540413b 100644 --- a/tools/xenstore/hashtable.h +++ b/tools/xenstore/hashtable.h @@ -45,6 +45,22 @@ create_hashtable(const void *ctx, const char *name, int hashtable_add(struct hashtable *h, const void *k, void *v); +/***************************************************************************** + * hashtable_replace + + * @name hashtable_nsert + * @param h the hashtable to insert into + * @param k the key - hashtable claims ownership and will free on removal + * @param v the value - does not claim ownership + * @return zero for successful insertion + * + * This function does check for an entry being present before replacing it + * with a new value. + */ + +int +hashtable_replace(struct hashtable *h, const void *k, void *v); + /***************************************************************************** * hashtable_search -- 2.35.3
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