Quiz on 2PL

Consider a transaction with the following operations: $read[a] \rightarrow write[b] \rightarrow commit$, follows this schedule for its execution: $readlock[a],\ read[a],\ readunlock[a],\ writelock[b],\ write[b],\ writeunlock[b].$

Based on your understanding of the basic rules of 2PL, does the schedule above follow those rules?