alias(Alias)

Alias is the alias name of thread Id.

detached(Boolean)

Current detached status of the thread.

id(Integer)

Integer identifier for the thread. Can be used as argument to the thread predicates, but applications must be aware that these references are reused.

status(Status)

Current status of the thread. Status is one of:

running

The thread is running. This is the initial status of a thread. Please note that threads waiting for something are considered running too.

suspended

Only if the thread is an engine (see section 10). Indicates that the engine is currently not associated with an OS thread.

false

The Goal of the thread has been completed and failed.

true

The Goal of the thread has been completed and succeeded.

exited(Term)

The Goal of the thread has been terminated using thread_exit/1 with Term as argument. If the underlying native thread has exited (using pthread_exit()) Term is unbound.

exception(Term)

The Goal of the thread has been terminated due to an uncaught exception (see throw/1 and catch/3).

engine(Boolean)

If the thread is an engine (see chapter 10), Boolean is true. Othwerwise the property is not present.

thread(ThreadId)

If the thread is an engine that is currently attached to a thread, ThreadId is the thread that executes the engine.

system_thread_id(Integer)

Thread identifier used by the operating system for the calling thread. Not available on all OSes. This is the same as the Prolog flag system_thread_id for the calling thread. Access to the system thread identifier can, on some systems, be used to gain additional control over or information about Prolog threads.

See also thread_statistics/3 to obtain resource usage information and message_queue_property/2 to get the number of queued messages for a thread.