> At some point in the not too distant past I went over the shm interfaces in
> contemplation of a Hurd implementation. I don't really recall anything
> specific about it, but my vague recollection is that I concluded there was
> just one new interface or quirk of functionality that would be required to
> meet the basic shm semantics (leaving aside the pid reporting and all
> that). Maybe shm lets you continue to open a file after it's been deleted
> but still has live users? Something like that.
The quirk is that the shmid _object_ is not remove from the system until
after the last user has detached, however, the shmid_ds is removed on
the IPC_RMID. Thus, normal Hurd semantics win: we remove the node (and
the shmid_ds) and the memory object is not killed until all users
vm_deallocate it.
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