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[[!tag open_issue_gnumach]]
There currently is no kernel-land preemption in GNU Mach, only user-land preemption.
If GNU Mach were made a a preemptive kernel, using [[continuation]]s would
probably no longer make sense as the kernel itself, that is, kernel threads can
be preempted, and then their full state needs to be preserved.
See also [[open_issues/multithreading]].
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