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Edata cache: atomic fetch-add -> load-store.

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The modifications to count are protected by a mutex; there's no need to use the
more costly version.
This commit is contained in:
David Goldblatt 2020-02-18 17:26:32 -08:00 • committed by David Goldblatt
parent 99b1291d17
commit 0dcd576600
1 changed files with 4 additions and 2 deletions
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6
src/edata_cache.c
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@ -27,7 +27,8 @@ edata_cache_get(tsdn_t *tsdn, edata_cache_t *edata_cache) {
return base_alloc_edata(tsdn, edata_cache->base);
}
edata_avail_remove(&edata_cache->avail, edata);
atomic_fetch_sub_zu(&edata_cache->count, 1, ATOMIC_RELAXED);
size_t count = atomic_load_zu(&edata_cache->count, ATOMIC_RELAXED);
atomic_store_zu(&edata_cache->count, count - 1, ATOMIC_RELAXED);
malloc_mutex_unlock(tsdn, &edata_cache->mtx);
return edata;
}
@ -36,7 +37,8 @@ void
edata_cache_put(tsdn_t *tsdn, edata_cache_t *edata_cache, edata_t *edata) {
malloc_mutex_lock(tsdn, &edata_cache->mtx);
edata_avail_insert(&edata_cache->avail, edata);
atomic_fetch_add_zu(&edata_cache->count, 1, ATOMIC_RELAXED);
size_t count = atomic_load_zu(&edata_cache->count, ATOMIC_RELAXED);
atomic_store_zu(&edata_cache->count, count + 1, ATOMIC_RELAXED);
malloc_mutex_unlock(tsdn, &edata_cache->mtx);
}