Explain how a shared region could be used for a process to read data written by the kernel. Include in your explanation what would be necessary for synchronization.
What will be an ideal response?
The shared region is mapped read-only into the process’s address space, but is writable by the kernel.The process reads data from the region using standard LOAD instructions (avoiding a TRAP). The process may poll the data in the region from time to time to see if it has changed. However, we may require a way for the kernel to notify the process when it has written new data. A software interrupt can be used for this purpose.
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