To retain any part of the existing unix process management
we need some processes that show up in multiple pid spaces.
To allow for migration it must be possible for the pids in those pid
spaces to be different.
It is undesirable in the normal case of affairs to allocate more
than one pid per process.
Given the small range of pid values these constraints make an
efficient and general pid space solution challenging.
The question:
If we could add additional pid values in different pid spaces to a
process with a syscall upon demand would that lead to an
implementation everyone could use?
I assume most processes by default only have a pid value in a single
pid space.
The reason I ask is that I believe I know how to implement a cheap
general mechanism for adding additional pids to a process.
Eric
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