Date: Wed, 08 Dec 1999 20:57:04 -0700 From: Brett Glass <brett@lariat.org> To: Tani Hosokawa <unknown@riverstyx.net>, Jonathon McKitrick <jcm@dogma.freebsd-uk.eu.org> Cc: Alfred Perlstein <bright@wintelcom.net>, Roelof Osinga <roelof@nisser.com>, Kris Kennaway <kris@hub.freebsd.org>, freebsd-chat <chat@FreeBSD.ORG> Subject: Re: Yahoo hacked last night Message-ID: <4.2.0.58.19991208204754.048bd8e0@localhost> In-Reply-To: <19991208172230.A6304@riverstyx.net> References: <Pine.BSF.4.02A.9912090117580.39859-100000@dogma.freebsd-uk.eu.org> <4.2.0.58.19991208172738.0495eef0@localhost> <Pine.BSF.4.02A.9912090117580.39859-100000@dogma.freebsd-uk.eu.org>
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Actually, "thunk" is a general term for a small snippet of code that the compiler must generate to create a connection between two parts of a program. The term was coined by the compiler writers who implemented "call by name" semantics for the Algol-66 compiler. When you pass an expression by name to a subroutine, it must be evaluated in the context of the calling routine each time the subroutine uses it as an r-value. To allow this to happen, the caller passed to the subroutine a pointer to ANOTHER subroutine (a "thunk") which provided the needed r-value on the fly. The thunk had to know how to access the stack frame which contained the context for the expression. (Yes, it could cause side effects in the caller's environment and had to be sensitive to such side effects as well.) "Trampoline code" is another kind of thunk. --Brett At 06:22 PM 12/8/1999 , Tani Hosokawa wrote: >Dunno much about Windows kernel, but thunking is just ugly conversions between 16 and 32 bit >operations. Prolly used to translate 16 bit socket connection into the 32 bit network >subsystem. MS is just stupid. > >On Thu, Dec 09, 1999 at 01:18:40AM +0000, Jonathon McKitrick wrote: > > > > So what exactly is 'thunk-connect' in the windows kernel, anyway? And how > > did M$ blame something other than segmentation for its woes? > > > > > > -jm > > > > ------------------ > > > > > > > > > > To Unsubscribe: send mail to majordomo@FreeBSD.org > > with "unsubscribe freebsd-chat" in the body of the message > >-- >--- >tani hosokawa >river styx internet > > > >To Unsubscribe: send mail to majordomo@FreeBSD.org >with "unsubscribe freebsd-chat" in the body of the message To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-chat" in the body of the message
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