PL_HALT_WITH_EXCEPTION

When specified, try to raise unwind(halt(status)). If this is not possible, ignore this flag. Return false.

PL_CLEANUP_NO_RECLAIM_MEMORY

Never reclaim the memory, leaving this task to the OS. This is the default unless the system is compiled for debugging.

PL_CLEANUP_NO_CANCEL

Do not allow hooks to cancel halting the system.

Unless PL_HALT_WITH_EXCEPTION was specified and effective, Clean up the Prolog environment using PL_cleanup() and if successful call exit() with the status argument. Returns true if exit was cancelled by PL_cleanup().^{238Versions up to 9.3.12 returned false on cancel. If necessary, the two behaviours can be distinguished based on the existence of the PL_HALT_WITH_EXCEPTION macro.}