Abstract: A cpu-set type multiprocessor system allows a cpu of a cpu-set that has a hardware exception to disable itself and notify the system. The system assigns processes of the cpu-set that include the problem cpu to another cpu-set. The disabling of the problem cpu and transfer of the related processes to another cpu-set allows the system to failsoft so that other cpu-sets the multiprocessor system can continue to run and a recovery of the processes being run on the problem cpu-set occurs.

Abstract: A system that, at a process checkpoint, pauses the process to copy the system state for the process and then copies pages of the process in memory to disk storage while the process continues to run. When a write to a page by the process is to occur that requires a translation from a virtual address to a physical address the write is intercepted. The page that is being modified is duplicated and then the process is allowed to modify the page and continue. The duplicate page is then stored as part of the checkpoint copy.

Abstract: A pneumatic cylinder assembly and a method for lifting a hand truck frame generally vertically away from a ground surface exploits a cylinder housing including a longitudinal axis and first and second ends. The cylinder housing defines a cylinder cavity at the first end and a port generally at the second end in operative communication with the cylinder cavity and has at least one frame attachment point for attachment of the housing to the hand truck frame. A piston in the cylinder cavity is moveable in a first direction. A fluid space is defined between the actuation surface within the cylinder housing. An inlet valve is configured to admit a working fluid into the fluid space through the port at a pressure greater than an ambient pressure, thereby urging the piston in the first direction thereby to cause the movement of the piston in the first direction lifting the truck.