A simple locking helper that ensures an asyncronous function is only called once until unlocked.
Ｄｏｗｎｌｏａｄ ｅｂｏｏｋ ｐｄｆ ｍｏｂｉ ｅｐｕｂ Dedeker Winston The Smart Girl's Guide to Polyamory is available now
Add table-level database locking to ActiveRecord