LOCK without Arguments

The argumentless LOCK releases (unlocks) all locks currently held by the process in all namespaces. This includes exclusive and shared locks, both local and global. It also includes all accumulated incremental locks. For example, if there are three incremental locks on a given lock name, InterSystems IRIS releases all three locks and removes the lock name entry from the lock table.

If you issue an argumentless LOCK during a transaction, InterSystems IRIS places all locks currently held by the process in a Delock state until the end of the transaction. When the transaction ends, InterSystems IRIS releases the locks and removes the corresponding lock name entries from the lock table.

The following example applies various locks during a transaction, then issues an argumentless LOCK to release all of these locks. The locks are placed in a Delock state until the end of the transaction. The HANG commands give you time to check the lock’s ModeCount in the Lock Table:

  TSTART
  LOCK +^a(1)      // ModeCount: Exclusive
  HANG 2
  LOCK +^a(1)#"E"  // ModeCount: Exclusive/1+1e
  HANG 2
  LOCK +^a(1)#"S"  // ModeCount: Exclusive/1+1e,Shared
  HANG 2
  LOCK             // ModeCount: Exclusive/1+1e->Delock,Shared->Delock
  HANG 10
  TCOMMIT          // ModeCount: locks removed from table

Argumentless LOCK releases all locks held by the process without applying any locks. Completion of a process also releases all locks held by that process.

LOCK with Arguments