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[[!tag open_issue_gnumach]]
[[Mach]] internally uses *[[/continuation]]*s for kernel [[thread]] management.
The advantage is that not a full kernel thread stack has to be preserved in
case that a thread is about to enter a blocking state. This saves space. It
is not clear this is still worthwhile given today's RAM offerings. (How many
kernel threads are there, typically?)
And, this would no longer be possible in case Mach were be made a
[[preemptive|preemption]] kernel. In the latter case, the kernel itself, that
is, kernel threads can be preempted, and then their full state needs to be
preserved.
See also [[service_solahart_jakarta_selatan__082122541663/multithreading]].
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