I don’t see one on the documentation, but you might try calling uv_kill directly with
julia> @ccall uv_kill(43181::Cint, 0::Cint)::Cint
0
julia> @ccall uv_kill(43182::Cint, 0::Cint)::Cint
-3
Documentation says it might work on Windows, worth a test!
Edit: Oops, sniped!