Date: Sat, 9 Sep 2000 00:13:49 +0200 From: "Ralf S. Engelschall" <rse@engelschall.com> To: freebsd-hackers@freebsd.org Subject: Re: makecontext & friends ? Message-ID: <20000909001349.A4997@engelschall.com>
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In article <Pine.SUN.3.91.1000908125247.14774A-100000@pcnet1.pcnet.com> you wrote:
> On Fri, 8 Sep 2000, Ralf S. Engelschall wrote:
>>
>> In article <20000908151942.A15852@lamu.hermes.si> you wrote:
>>
>> > are there any plans to implement makecontext() & friends
>> > functions in FreeBSD?
>>
>> I don't know of any plans myself, but I would appreciate that we support this
>> standardized ucontext(3) API in FreeBSD. The API is actually not the problem,
>> the question is on what should this API internally be based? On an own
>> mechanism or on an existing mechanism (jmp_buf, etc)?
>
> My implementation of it was based on a trapframe, so it would be
> easy to pass a ucontext_t to the kernel and have it switch to
> the context at appropriate times (scheduler activations). A
> trapframe is the same as a sigcontext_t (ucontext_t) for i386
> but not for the alpha. I think I got around this by adding a
> type field to the ucontext (or mcontext) to indicate which
> format it was for alpha.
Sounds good -- where can I find a copy of your implementation?
I would like to look at it in more detail.
Ralf S. Engelschall
rse@engelschall.com
www.engelschall.com
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