Research and Implementation of High Availability Toolkit Based on QNX

This paper presents a high availability toolkit(HAT) which can respond quickly within some milliseconds based on QNX6.20 RTOS.Through passive listening and active polling, HAT monitors the system services and user processes to guarantee that any thread would run reliablyand correctly. It is applied to a poloidal field power supply control system of nuclear fusion device, and achieves good effects.