Three Threads, One Terminal: Concurrency in Rust with Channels and Atomics

The shutdown sequence in broll ensures a clean termination of the application by following a specific order of operations:

1. Close the Channel (drop(tx)):

   • This step signals the storage thread to stop processing new messages and begin its cleanup process.

2. Wait for the Shell Process to Exit (child.wait()):

   • The shell process (e.g., bash, zsh) is waited on before proceeding further, ensuring that all input/output operations with the shell are completed.

3. Restore Terminal Mode (drop(_raw_guard)):

   • _raw_guard is a guard object that ensures the terminal mode is restored to its original state when dropped. This step is crucial for returning the terminal to a usable state after running in raw mode, which disables certain input processing features.

4. Wait for Storage Thread to Finish (storage_handle.join()):

   • The storage thread is responsible for handling VT100 parsing and rendering of command output. By joining this handle, you ensure that all data has been flushed to the SQLite database before proceeding further.

5. Mark Session as Ended (db.end_session(&session_id)):

   • This final step updates the session

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