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List:       cap-talk
Subject:    Re: [cap-talk] Yes. (was: Can we stop discussing Butler
From:       Norman Hardy <norm () cap-lore ! com>
Date:       2008-04-11 23:45:25
Message-ID: 529FD8E4-4CB1-4D8E-86A0-58676386B04E () cap-lore ! com
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On 2008 Apr 11, at 9:25 , Charles Forsyth wrote:

>> I believe that in Cal/TSS the sending of a message to another
>> 'process' designated the recipient by an unprotected global integer.
>> This is a fatal design in the modern capabilities view.
>
> event channels (queues) were accessed through capabilities.
>
> http://www.mcjones.org/CalTSS/CalTSS.pdf points to a good handful of  
> papers and
> reports about the system.  i particularly liked the more abstract  
> IBM report
> "The Control Structure of an Operating System", which had a big  
> influence on me when it first appeared.
> i remember writing a heavily stripped-down subset once in B, to get  
> the feel of it.

I agree that the paper you reference describes messages as directed  
thru channels via capabilities and thus avoids the problem I referred  
to.
I don't know where I got the mistaken idea; perhaps from an earlier  
preliminary document.
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