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e> <007301c736ac$5c99da10$1200a8c0 at gsicomp.on.ca> <45A838AA.9030008 at fs.ei.tum.de> <200701130306.l0D36JX8007342 at apollo.backplane.com> <45A87472.3040108 at fs.ei.tum.de> <45A879FF.8060407 at exemail.com.au> <200701130649.l0D6nE8j008759 at apollo. backplane.com> <009301c73746$cdce3470$1200a8c0 at gsicomp.on.ca> <200701132000.l0DK0QsA020885 at ap ollo.backplane.com> <00b101c738XXXXX>OXLXS(OFrom: Matthew Dillon <dillon at apollo.backplane.com> <200701152301.l0FN1BR5039049 at apollo.backplane.com>
From: "Simon 'corecode' Schubert" <corecode at fs.ei.tum.de>
Subject: Re: Request for swapcontext and getcontext to be ported to our libc
 [ revision 3 ]
Date: Tue, 16 Jan 2007 01:05:32 +0100
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users-errors at crater.dragonflybsd.org wrote:

^^^^ matt, your email seems mangled

>     There is one more issue, and that is an atomicy issue.  We want the
>     new signal mask to be set simultaniously with the restoration of the
>     context (or most of it).  This means that all signals must be masked
>     temporarily while restoring the context.  But don't worry about it,
>     I can handle that part as well.  It does mean an extra system call
>     but that isn't our concern at the moment.

so the sequence is something like

sigprocmask(SIG_BLOCK, ALL, &ocntx->uc_sigmask);
swap registers+stacks
sigprocmask(SIG_SETMASK, &ncntx->us_sigmask, NULL);

for swapcontext.

am i wrong or is setcontext essentially

swapcontext(&tmpcontext, newcntx); ?

cheers
  simon

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