Uninterruptible sleep

Uninterruptible sleep

In computer operating systems terminology, a sleeping process can either be interruptible (woken via signals) or uninterruptible (woken explicitly). An uninterruptible sleep state is a sleep state that cannot handle a signal (such as waiting for disk or network IO (input/output)).

When the process is sleeping uninterruptibly, the signal will be noticed when the process returns from the system call or trap.

See also

* Sleep (operating system)

External links

* [http://unix-tree.huihoo.org/Net2Kern/kern/kern_sig.c.html Unix source tree: Net2Kern/kern/kern_sig.c]
* [http://www.daemon-systems.org/man/postsig.9.html NetBSD Kernel Developer's Manual - SIGNAL(9) man page]
* [http://markhobley.yi.org:8000/killdeepsleep killing a process in an uninterruptable sleep state]


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