* Use poll() if it is available, or select() otherwise, to efficiently wait on index builds in worker queries to finish. * fix off-by-one error when initially assigning workers * move PQsetnonblocking() calls to setup_workers()
* Use poll() if it is available, or select() otherwise, to efficiently wait on index builds in worker queries to finish. * fix off-by-one error when initially assigning workers * move PQsetnonblocking() calls to setup_workers()