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In databases and transaction processing, two-phase locking (2PL) is a concurrency control method that guarantees serializability.
It is also the name of the resulting set of database transaction schedules (histories). The protocol utilizes locks, applied by a transaction to data, which may block (interpreted as signals to stop) other transactions from accessing the same data during the transaction's life.
By the 2PL protocol, locks are applied and removed in two phases:
Expanding phase: locks are acquired and no locks are released.
Shrinking phase: locks are released and no locks are acquired.Two types of locks are utilized by the basic protocol: Shared and Exclusive locks. Refinements of the basic protocol may utilize more lock types. Using locks that block processes, 2PL may be subject to deadlocks that result from the mutual blocking of two or more transactions.
Stripped Glock 48/43X frame with locking block - used
Please see pics, there are some pretty good scratches on the inside. The previous owner appears to have had a bit of trouble installing mag release spring. This does not affect function and the frame has about 500 flawless rounds...