Re: Funnel Funnel Funnel
Re: Funnel Funnel Funnel
- Subject: Re: Funnel Funnel Funnel
- From: Jim Magee <email@hidden>
- Date: Mon, 15 Mar 2004 11:04:20 -0500
Not every system call takes a funnel by default. As was said before by
Justin, none of the Mach or IOKit system calls take one. But also,
some BSD system calls don't take them either. And, even for those that
do, when the thread is blocked in the system call it drops the funnel
so that another thread can use it (the code in the system call must be
able to deal with the state of things changing each time it
[potentially] blocks).
--Ji
On Mar 12, 2004, at 11:41 PM, Ramble Leon wrote:
>
Thanks, does it mean any syscall will hold a funnel
>
when it enter kernel? If no thread_funnel_switch
>
inside, a syscall cannot be called by two or more
>
threads running on differenct processors at same time,
>
is it right?
>
>
--- Quinn <email@hidden> wrote:
>
> At 2:04 -0800 12/3/04, Ramble Leon wrote:
>
>> Hi, I'm confused by funnel in darwin, I was
>
> reading
>
>> some source code of nfs, there is no
>
> thread_funnel_set
>
>> can be found in some vfs syscall, but there are
>
> many
>
>> thread_funnel_switch inside nfs implement, when did
>
>> the system call get the kernel_funnel?
>
>
>
> Funnels are acquired as part of system call entry.
>
> Check out the
>
> sy_funnel field of the sysent structure.
>
>
>
> S+E
>
> --
>
> Quinn "The Eskimo!"
>
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