BOUNCE rtl@rtlinux.org: Approval required: Non-member submissionfrom [Anders Gnistrup <agn@city.dk>] (fwd)

[Der Herr Hofrat <der.herr@hofr.at>]

>From owner-rtl Sat Jun 16 07:57:49 2001
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Date: Sat, 16 Jun 2001 14:45:23 -0100
From: Anders Gnistrup <agn@city.dk>
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To: rtl@fsmlabs.com
Subject: spinlocks i RT-linux
References: <3AB7121C.80406@bahnhof.se> <3B293EEF.3C7F1489@as.arizona.edu> <3B2AE21F.587F0A00@pacifier.com>
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Hi All. this is a simple and a yes/no question

Is you use a semaphore is RT-linux to protect a piece of code, and a thread try
to enter while another is using that piece of code the thread is syspended. But
what is I use a spinlock? is linux kernel space this will cause a busy wait,
but will the same happen in RT-linux.

The reason way I am asking is that subdevices i comedi is protectet by
spinlocks.

Anders Gnistrup

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