Linux. It already rules on servers, routers, HPC, embedded, end-user devices TV's smartphones, tablets it is even used in infotainment for land vehicles and air

Linux. It already rules on servers, routers, HPC, embedded, end-user devices TV's smartphones, tablets it is even used in infotainment for land vehicles and aircraft and found some usage in space like the helicopter that flies on Mars. Nevertheless, nothing of this is even close to the lifespan boost it will get once the real time patch gets mainlined. Once Linux becomes a realtime OS, given its mindshare, it will certainly be adopted by deep pocket industries which have a history of paying to maintain their systems while updating them rarely. So, there is a reasonable probability of Linux becoming the COBOL of realtime systems; I don't think it will ever dethrone QNX or VxWorks, but it will very likely find a comfortable place that will guarantee maintaince (and jobs) for decades to come.