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lib: Update hash.h documentation to warn of a possible crash

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Multiple deletions from the hash_walk or hash_iteration calls
during a single invocation of the passed in function can and
will cause the program to crash.  Warn against doing such a
thing.

Signed-off-by: Donald Sharp <sharpd@nvidia.com>
(cherry picked from commit 341743ac5b)
This commit is contained in:
Donald Sharp 2021-12-01 17:03:38 -05:00 committed by mergify-bot
parent c32c32c931
commit 21ab672e6c
1 changed files with 8 additions and 5 deletions
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13
lib/hash.h
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@ -235,9 +235,10 @@ extern void *hash_release(struct hash *hash, void *data);
/*
* Iterate over the elements in a hash table.
*
* It is safe to delete items passed to the iteration function from the hash
* table during iteration. More than one item cannot be deleted during each
* iteration. Please note that adding entries to the hash
* The passed in arg to the handler function is the only safe
* item to delete from the hash.
*
* Please note that adding entries to the hash
* during the walk will cause undefined behavior in that some new entries
* will be walked and some will not. So do not do this.
*
@ -258,8 +259,10 @@ extern void hash_iterate(struct hash *hash,
/*
* Iterate over the elements in a hash table, stopping on condition.
*
* It is safe to delete items passed to the iteration function from the hash
* table during iteration. Please note that adding entries to the hash
* The passed in arg to the handler function is the only safe item
* to delete from the hash.
*
* Please note that adding entries to the hash
* during the walk will cause undefined behavior in that some new entries
* will be walked and some will not. So do not do this.
*