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[[!meta copyright="Copyright © 2010, 2011 Free Software Foundation, Inc."]]
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[[!tag open_issue_hurd]]
Hurd servers / VFS libraries are multithreaded.
# Implementation
* well-known threading libraries
* [[hurd/libthreads]]
* [[hurd/libpthread]]
# Design
See [[hurd/libports]]: roughly using one thread per
incoming request. This is not the best approach: it doesn't really make sense
to scale the number of worker threads with the number of incoming requests, but
instead they should be scaled according to the backends' characteristics.
The [[hurd/Critique]] should have some more on this.
[*Event-based Concurrency
Control*](http://soft.vub.ac.be/~tvcutsem/talks/presentations/T37_nobackground.pdf),
Tom Van Cutsem, 2009.
# Alternative approaches:
* <http://www.concurrencykit.org/>
* Continuation-passing style
* [[microkernel/Mach]] internally [[uses
continuations|microkernel/mach/continuation]], too.
* [[Erlang-style_parallelism]]
* [[!wikipedia Actor_model]]; also see overlap with
{{$capability#wikipedia_object-capability_model}}.
* [libtcr - Threaded Coroutine Library](http://oss.linbit.com/libtcr/)
* <http://monkey.org/~provos/libevent/>
---
See also: [[multiprocessing]].
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