def get_index(corpus: Corpus, monitor: ProgressMonitor, multiple_processors=False, **kargs) -> Index:
"""
Get the index for the provided corpus, reindexing (and tokenizing) if needed
"""
with _GLOBAL_LOCK:
if not hasattr(corpus, "_orange3sma_index_lock"):
corpus._orange3sma_index_lock = Lock()
with corpus._orange3sma_index_lock:
ix = getattr(corpus, "_orange3sma_index", None)
if not (ix and ix.tokens is corpus._tokens):
monitor.update(0, "Getting tokens")
corpus.tokens # force tokens
procs = max(1, multiprocessing.cpu_count()-1) if multiple_processors else 1
monitor.update(50, "Creating index")
ix = Index(corpus, procs=procs, **kargs)
corpus._orange3sma_index = ix
return ix
