diff options
| author |   Dave Barach <dbarach@cisco.com> | 2017-07-21 10:44:27 -0400 |
|---|---|---|
| committer |   John Lo <loj@cisco.com> | 2017-07-23 00:55:13 +0000 |
| commit | 858c06fac65e7ad05dc6e739a51e8d87a544e0fe (patch) | |
| tree | 9ec733957457854b84a8ae1aa37aa47cf5d641c2 /src/vppinfra/bihash_template.c | |
| parent | 6534b7aa13bc5bed15ed87f47bb766405963e9e8 (diff) | |
Atomic bucket lock
Change-Id: I84908b9ad30d7555024e98b69ed37b111f31c27a
Signed-off-by: Dave Barach <dbarach@cisco.com>
Diffstat (limited to 'src/vppinfra/bihash_template.c')
| -rw-r--r-- | src/vppinfra/bihash_template.c | 27 |
1 files changed, 14 insertions, 13 deletions
diff --git a/src/vppinfra/bihash_template.c b/src/vppinfra/bihash_template.c index e3a5759d..b5eb379a 100644 --- a/src/vppinfra/bihash_template.c +++ b/src/vppinfra/bihash_template.c @@ -135,8 +135,9 @@ BV (make_working_copy) (BVT (clib_bihash) * h, BVT (clib_bihash_bucket) * b) clib_mem_set_heap (oldheap); - /* Turn off the cache */ - BV (clib_bihash_cache_enable_disable) (b, 0); + /* Lock the bucket... */ + while (BV (clib_bihash_lock_bucket) (b) == 0) + ; v = BV (clib_bihash_get_value) (h, b->offset); @@ -416,7 +417,7 @@ expand_ok: unlock: BV (clib_bihash_reset_cache) (b); - BV (clib_bihash_cache_enable_disable) (b, 1 /* enable */ ); + BV (clib_bihash_unlock_bucket) (b); CLIB_MEMORY_BARRIER (); h->writer_lock[0] = 0; return rv; @@ -444,7 +445,7 @@ int BV (clib_bihash_search) return -1; /* Check the cache, if currently enabled */ - if (PREDICT_TRUE (b->cache_lru & (1 << 15))) + if (PREDICT_TRUE ((b->cache_lru & (1 << 15)) == 0)) { limit = BIHASH_KVP_CACHE_SIZE; kvp = b->cache; @@ -475,16 +476,16 @@ int BV (clib_bihash_search) *valuep = v->kvp[i]; /* Shut off the cache */ - BV (clib_bihash_cache_enable_disable) (b, 0); - CLIB_MEMORY_BARRIER (); - - cache_slot = BV (clib_bihash_get_lru) (b); - b->cache[cache_slot] = v->kvp[i]; - BV (clib_bihash_update_lru) (b, cache_slot); + if (BV (clib_bihash_lock_bucket) (b)) + { + cache_slot = BV (clib_bihash_get_lru) (b); + b->cache[cache_slot] = v->kvp[i]; + BV (clib_bihash_update_lru) (b, cache_slot); - /* Reenable the cache */ - BV (clib_bihash_cache_enable_disable) (b, 1); - h->cache_misses++; + /* Reenable the cache */ + BV (clib_bihash_unlock_bucket) (b); + h->cache_misses++; + } return 0; } } |