Module session_lock 

Per-session journal ownership lock.

Whoever holds a Runtime for session X holds an exclusive advisory flock on <sessions_dir>/<id>.lock. Two runtimes for the same journal are never allowed — the second caller gets an actionable error pointing at the holder’s pid.

The lock is released on drop (or when the process dies — flock semantics). Stale lock files from dead processes never block.

Structs

LockHolder

Body written into the lock file so the error message can name the holder.

SessionLock

Held for the runtime’s lifetime; dropping releases the flock.

Enums

SessionLockError

Functions

lock_path

Lock-file path for a session (for cleanup).

sessions_dir

The sessions directory (delegates to config).