Date: Mon, 7 Jan 2002 12:13:21 -0800 (PST) From: Julian Elischer <julian@elischer.org> To: Daniel Eischen <eischen@pcnet1.pcnet.com> Cc: Nate Williams <nate@yogotech.com>, Dan Eischen <eischen@vigrid.com>, Peter Wemm <peter@wemm.org>, Archie Cobbs <archie@dellroad.org>, Alfred Perlstein <bright@mu.org>, arch@FreeBSD.ORG Subject: Re: Request for review: getcontext, setcontext, etc Message-ID: <Pine.BSF.4.21.0201071211360.28827-100000@InterJet.elischer.org> In-Reply-To: <Pine.SUN.3.91.1020107144700.10060A-100000@pcnet1.pcnet.com>
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On Mon, 7 Jan 2002, Daniel Eischen wrote: > > Thread 1: > --------- > /* munch some FP stuff */ > pthread_yield(); /* allow thread 2 to run */ > /* munch some more FP stuff */ On which thread's behalf is this later munching being done? > > Assume that pthread_yield only saves the FP control word (which > is what it does currently in libc_r). > > Thread 2: > --------- > /* FP munchy munchy */ > pthread_yield(); /* allow thread 1 to run */ > /* FP munchy munch munch */ ditto.. Are you suggesting that the FPU continues to operate on behalf of the previous thread after the yield? > > > What FP state exists in registers across the call to > pthread_yield(). > > -- > Dan Eischen > > To Unsubscribe: send mail to majordomo@FreeBSD.org > with "unsubscribe freebsd-arch" in the body of the message > To Unsubscribe: send mail to majordomo@FreeBSD.org with "unsubscribe freebsd-arch" in the body of the message
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