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A hard real-time system is a system that requires a guaranteed response to specific events within a defined time period
http://linuxdevices.com/articles/AT3479098230.html
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Foreword: This study compares the real-time capabilities of various Linux kernels. It was part of a project to upgrade the control software in water-wave generators at research institutions around the world. The results of the study were used by Akamina for the selection of a new RTOS for the control system upgrade of Canada's largest hydraulics and coastal engineering laboratory, the National Research Council Canadian Hydraulics Centre in Ottawa.