…#496)

The suppress(OSError) context manager doesn't catch ValueError, which
is raised by int(pid_str) when the lock file content is corrupted or
contains non-numeric data on the PID line. This crashes the lock
acquisition instead of gracefully skipping the stale lock check.

A corrupted lock file should be treated the same as any other
unreadable lock file — the stale lock check should be skipped
and acquisition should proceed normally.

…timeout (#498)

* Fix ValueError in _acquire_transaction_lock when blocking=False with timeout

threading.Lock.acquire() raises ValueError when called with
blocking=False and a timeout argument, since Python does not allow
specifying a timeout for a non-blocking call.

Handle blocking=False as a separate branch that never passes a
timeout, regardless of the timeout parameter value.

* Add test and fix lint for non-blocking with timeout

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Co-authored-by: Kadir Can Ozden <[email protected]>