A question about the softirq implementation in DDE Linux26

Da Zheng zhengda1936 at gmail.com
Mon Mar 1 17:21:18 CET 2010


Hi,

On 10-3-1 下午11:59, Björn Döbel wrote:
> Compiles and runs for me right now. However, this solution does a global
> IRQ disable by using a global CLI/STI lock and therefore does not adhere
> to the DDE semantics of every thread running on its own virtual CPU. So,
> this may not be the final solution we'll end up with, but if it works
> for you, feel free to go ahead with it.
I don't know why DDE needs this kind of semantics. Does the implementation of
DDE reply on it? or how does DDE reply on it?
> 
>>> L4Linux uses a threaded lock implementation for that reason, so we'll
>>> discuss reusing this idea.
>> What is a threaded lock?
> 
> It's a lock implementation that uses a dedicated thread to serialize
> lock accesses and implements waiting on a lock by blocking in an IPC to
> this thread.
Isn't it also like a global lock?

Best regards,
Zheng Da




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