Fix potential deadlock in signaling spec
Fix potential deadlock in signaling spec

jstoja/celluloid,sideci-sample/sideci-sample-celluloid,seuros/celluloid,jasonm23/celluloid,mehta/celluloid,davydovanton/celluloid,olleolleolle/celluloid,dilumn/celluloid,TiagoCardoso1983/celluloid,marshall-lee/celluloid,celluloid/celluloid,tarcieri/celluloid,kenichi/celluloid