Availability:built-in
- Set the Prolog flag exit_status 
to Status.
 - Call all hooks registered using at_halt/1. 
If Status equals 0 (zero), any of these hooks calls cancel_halt/1, 
termination is cancelled.
 - Call all hooks registered using PL_at_halt(). In the future, 
if any of these hooks returns non-zero, termination will be cancelled. 
Currently, this only prints a warning.
 - Perform the following system cleanup actions:
- Cancel all threads, calling thread_at_exit/1 registered termination hooks. Threads not responding within 1 second are cancelled forcefully.
 - Flush I/O and close all streams except for standard I/O.
 - Reset the terminal if its properties were changed.
 - Remove temporary files and incomplete compilation output.
 - Reclaim memory.
 
 - Call exit(Status) to terminate the process