Date: Wed, 29 Nov 2000 23:39:12 -0800 From: Marcel Moolenaar <marcel@cup.hp.com> To: Terry Lambert <tlambert@primenet.com> Cc: Alfred Perlstein <bright@wintelcom.net>, Marc Slemko <marcs@znep.com>, Daniel Eischen <eischen@vigrid.com>, arch@FreeBSD.ORG Subject: Re: Modifying FILE to add lock Message-ID: <3A260420.6A753ECB@cup.hp.com> References: <200011300653.XAA07381@usr08.primenet.com>
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Terry Lambert wrote: > > You might consider using the old "debugging malloc" trick, > of allocating one structure, but referring to another, and > reference your "hidden" lock at a negative offset. Hmmmm.... yes. This would present an unchanged struct __sFILE to programs, but adding a field at the end would also present an unchanged struct __sFILE. In both cases, the program doesn't know there are more fields; either before or after what it thinks is struct __sFILE. Adding to the struct however is much simpler. -- Marcel Moolenaar mail: marcel@cup.hp.com / marcel@FreeBSD.org tel: (408) 447-4222 To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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