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Epilogue and Prologue code

Each process is responsible for saving and restoring its registers when it loses and gains the processor. The kernel notifies a process that it is about to gain or lose the processor by calling the processes' prologue and epilogue code. The locations of this code is set in the processes u-area.

Currently, this code does things like save and restore registers, check for timer time-outs, and check for signals.[*]

Thomas Pinckney