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From: Tijl Coosemans <tijl@ulyssis.org>
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Date: Fri, 9 Mar 2007 21:00:08 +0100
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Cc: Daniel Eischen <deischen@freebsd.org>, gerald@freebsd.org
Subject: Re: signalling remote threads
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On Friday 09 March 2007 18:18, Daniel Eischen wrote:
> On Fri, 9 Mar 2007, Tijl Coosemans wrote:
> > Is it somehow possible to send a signal to a specific thread in
> > another process similar to the linux tkill and tgkill syscalls?
> >
> > I've seen the thr_kill call that takes an lwpid as argument, but
> > it can't send a signal to another process can it?
> 
> No, it is not possible and it shouldn't be possible
> as it's not portable.  From outside the process, you
> can send a signal to another _process_ (which will
> be delivered to one of its threads depending on
> their signal masks), but not to a specific thread
> in another process.

Ok, thanks. The reason I asked is because Wine uses this to let the
wineserver process (windows kernel) send signals to threads in a wine
process.

The only solution I see then is to have some sort of service thread in
the receiving process to dispatch the signal. That would be a portable
solution, but lots of work...