2 OS2: bare-banes kernel with process creation system-call

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2OS2: bare-banes kernel with process creation system-call🔗 i

dos/os2 extends dos by assuming that when the OS state is manipulated new processes can be created. A simple example is included in the source.

procedure
( os2-boot +curpszero) →
state? (treeof(-> state?state?))
+:(-> state?state?state?)
cur:state?
ps:(treeof(-> state?state?))
zero:state?

Like dos-boot but returns a list of processes in addition to the new state.

procedure
( os2-write st[#:threadsts])→state?
st:state?
ts:(treeof(-> state?state?))=null

A system call that returns the state st and creates additional processes specified in ts. Returns the next state, like dos-syscall .

procedure
( os2-exit st)→void?
st:state?

Like os2-write , but does not return.

procedure
( os2-test curp)→state?
cur:state?
p:(-> state?state?)

Runs the process p with the cur state and returns the state that it computes via os2-write or os2-exit .