CBL_THREAD_WAIT

Waits for completion of the specified non-detached thread, or returns immediately if the thread has already completed.

call "CBL_THREAD_WAIT" using by value thread-id
                       by reference   thr-return
                       returning      status-code

	Using call prototype (see Library Routines - Key)	Picture (32-bit systems)
thread-id	cblt-pointer	usage pointer.
thr-return	cblt-pointer	usage pointer.

thread-id A pointer to the thread identifier

thr-return	The thread's return value.
status-code	See RETURN-CODE Values For Thread-control Routines

The behavior of this routine is undefined if:

thread-id is invalid.
thread-id specifies a previously detached thread.
Two threads attempt to use CBL_THREAD_WAIT and/or CBL_THREAD_DETACH on the same thread at the same time.
While in a CBL_THREAD_WAIT, the target thread is killed by CBL_THREAD_KILL.

If the routine is successful, the thread's return value is stored in thr-return, the target thread is detached, and the call returns 0.