Fix up use of threading events
Fix up use of threading events

numba/numba,cpcloud/numba,stuartarchibald/numba,stuartarchibald/numba,stuartarchibald/numba,seibert/numba,cpcloud/numba,stonebig/numba,numba/numba,seibert/numba,stonebig/numba,gmarkall/numba,seibert/numba,IntelLabs/numba,cpcloud/numba,stonebig/numba,numba/numba,cpcloud/numba,numba/numba,IntelLabs/numba,stuartarchibald/numba,gmarkall/numba,numba/numba,gmarkall/numba,stuartarchibald/numba,IntelLabs/numba,IntelLabs/numba,IntelLabs/numba,gmarkall/numba,stonebig/numba,cpcloud/numba,stonebig/numba,gmarkall/numba,seibert/numba,seibert/numba