Fix the spawning off of the pipeling on a worker thread
Fix the spawning off of the pipeling on a worker thread

ronen/Halide,kgnk/Halide,kgnk/Halide,kgnk/Halide,jiawen/Halide,ronen/Halide,kgnk/Halide,ronen/Halide,psuriana/Halide,jiawen/Halide,psuriana/Halide,ronen/Halide,psuriana/Halide,jiawen/Halide,jiawen/Halide,kgnk/Halide,ronen/Halide,ronen/Halide,psuriana/Halide,ronen/Halide,psuriana/Halide,kgnk/Halide,jiawen/Halide,psuriana/Halide,ronen/Halide,kgnk/Halide,psuriana/Halide,jiawen/Halide,jiawen/Halide,kgnk/Halide