What is Threading Interrupt?

Question

(NB: this is not about interrupting Java / .NET threads, it's about kernel mode interrupts.)

Hi,

Wikipedia has something to say about interrupt streams in the Interrupt Handler :

Thread interruption

Several operating systems - Solaris, NetBSD, Mac OS X, WinCE and FreeBSD, for example, use a different scheme known as interrupt flows. the interrupt handler provided by the device driver is just a priority thread that works with interrupts and, more importantly, a block on the mutex. This greatly simplifies locking in the kernel. In addition, the interrupt flow may be supplanted by a higher priority interrupt thread.

What is the thread interrupt technology that FreeBSD (among others) seems to be using? And where can I find out more about this?

Thanks in advance.:)

Answer 1

The hardware reports interruptions to the operating systems of an event. They can be raised when an error occurs or if some peripheral devices have new data (the user pressed a key, a packet received on the network, a timer expired, ...). These interrupts must be quickly processed by the system (so that it looks responsive).

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Answer 2

- FreeBSD ithread (9).