I am currently reading about different approaches to ensure protection of shared resources in a system that supports multiples processes: the concept of mutual exclusion. Petersen's approach is very simple and elegant. A variant of this relies on the hardware by using the TSL hardware instruction. Fun stuff.
I also wrote and tested a C program that tests most of the system calls on Ubuntu Linux 9.0.4. It was a great experience. The actual exercise is to test this on Minix but I don't yet have a machine on which I can install and play with Minix.
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