From mboxrd@z Thu Jan  1 00:00:00 1970
To: 9fans@cse.psu.edu
Subject: Re: [9fans] EROS, Vapour
From: forsyth@caldo.demon.co.uk
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Message-Id: <20010831085903.C1F5E19A74@mail.cse.psu.edu>
Date: Fri, 31 Aug 2001 09:53:59 +0100
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	mode, all synchronizing via cheap test&set processor instructions, whereas 
	in Plan9/etc. an expensive switch to kernel mode is required, making 
	heavily parallel things unpractical (the cost of mutexes becomes higher 
	than the gain of parallelism).

i don't know about the `etc.' but in Plan 9, at least, if your application could
manage with only test and set processor instructions on Vapour it
would manage on Plan 9, using ... errr... test and set instructions
at user mode.