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| author |   Dave Barach <dave@barachs.net> | 2019-07-08 14:47:44 -0400 |
|---|---|---|
| committer |   Florin Coras <florin.coras@gmail.com> | 2019-07-11 18:04:20 +0000 |
| commit | 9e4946b324a8480b35c861e96199881b314ea825 (patch) | |
| tree | 262de11d4b5d913098d5c58ef99573d339b4e0e0 | |
| parent | 39040a619af4e8750349edba2e93eecb8ce4538b (diff) | |
vppinfra: bihash add-but-do-not-overwrite semantics
If is_add=2, fail w/ return value -2 if the key exists instead of
overwriting the (key,value) pair.
Type: feature
Change-Id: I00a3c194a381c68090369c31d6c6f9870cfe0a62
Signed-off-by: Dave Barach <dave@barachs.net>
| -rw-r--r-- | src/vppinfra/bihash_template.c | 7 |
1 files changed, 7 insertions, 0 deletions
diff --git a/src/vppinfra/bihash_template.c b/src/vppinfra/bihash_template.c index bf6be83b2e0..cd75a7a9be9 100644 --- a/src/vppinfra/bihash_template.c +++ b/src/vppinfra/bihash_template.c @@ -519,6 +519,13 @@ static inline int BV (clib_bihash_add_del_inline) { if (BV (clib_bihash_key_compare) (v->kvp[i].key, add_v->key)) { + /* Add but do not overwrite? */ + if (is_add == 2) + { + BV (clib_bihash_unlock_bucket) (b); + return (-2); + } + CLIB_MEMORY_BARRIER (); /* Add a delay */ clib_memcpy_fast (&(v->kvp[i]), add_v, sizeof (*add_v)); BV (clib_bihash_unlock_bucket) (b); |