Update: Reduce the number of lock requests to check if process is interrupted.

Update: Reduce the number of lock requests to check if process is interrupted.

The general rule is to check each arbitrarily large loop or between long running functions for interrupt.
Each lock attempt is also checked for interrupt before locking.

This is resulting in a bit too many checks (which are to some extend expensive because checking requires a lock).

Many of these checks are back to back because some explicit checks are called before normal locking requests (which themselves perform explicit checks).