item locks now lock hash table buckets

expansion requires switching to a global lock temporarily, so all buckets have
a covered read lock.

slab rebalancer is paused during hash table expansion.

internal item "trylocks" are always issued, and tracked as the hash power
variable can change out from under it.

1 files changed, 3 insertions, 0 deletions

diff --git a/slabs.h b/slabs.h
index 7c6140b..c649c06 100644
--- a/slabs.h
+++ b/slabs.h
@@ -43,4 +43,7 @@ enum reassign_result_type {
 
 enum reassign_result_type slabs_reassign(int src, int dst);
 
+void slabs_rebalancer_pause(void);
+void slabs_rebalancer_resume(void);
+
 #endif