Date: Fri, 22 Oct 2004 12:30:30 +0200 (CEST) From: Harti Brandt <harti@freebsd.org> To: =?iso-8859-1?q?Dag-Erling_Sm=F8rgrav?= <des@des.no> Cc: Max Laier <max@love2party.net> Subject: Re: cvs commit: src/sys/sys protosw.h src/sys/kern uipc_domain.cuipc_socket2.c Message-ID: <20041022122708.Y28348@beagle.kn.op.dlr.de> In-Reply-To: <xzpsm87xf4q.fsf@dwp.des.no> References: <200410191513.i9JFDUbf072176@repoman.freebsd.org> <417532A2.9000901@errno.com> <41753522.1E39FEAE@freebsd.org> <200410192329.46723.max@love2party.net> <41758B35.D5340AEA@freebsd.org> <20041020074747.B21281@beagle.kn.op.dlr.de> <xzpsm87xf4q.fsf@dwp.des.no>
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On Fri, 22 Oct 2004, [iso-8859-1] Dag-Erling Sm?rgrav wrote: DS>Harti Brandt <harti@freebsd.org> writes: DS>> You cannot prevent the compiler from makeing temporary copies. DS> DS>Yes, you can, using the volatile keyword. That doesn't help you if the compiler needs to fetch the function pointer into a register to call it. That would be allowed even if you declare the pointer volatile. Something like mov funcptr, r0 call @r0 If some other thread slips just between these two statements your call may end up somewhere. harti
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