C initializes proc's int and enum variables to 0. When ptable is implemented, struct proc proc[NPROC]; creates an array of 64 processes whose fields are initialized to 0 by the language. 0 happens to be the value of the UNUSED enumeration.
allocproc loops through ptable.proc looking for state=UNUSED, then initializes the first one it finds to all the needed values. So there's no need to explicitly initialize the structures in the array.
Ptable
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The struct ptable being a global variable was loaded into memory as a part of the bootmain() call during the booting of xv6 kernel. Since it is global, the default values are initialized.Now coming to how they are actually used for storing processes and when the entries are modified. 2351a5e196
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