缓存瞬时失效有关问题

缓存瞬时失效问题

http://www.cnblogs.com/sunli/archive/2010/09/06/cache_expire_same_time.html
http://www.cnblogs.com/sunli/archive/2010/07/27/cache_key_mutex.html

http://timyang.net/programming/memcache-mutex/