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From: Alfred Perlstein <alfred@freebsd.org>
To: Matthew Dillon <dillon@apollo.backplane.com>
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Cc: wine-freebsd@hub.org, Kris Moore <krismoore@comcast.net>,
	Scott Long <scottl@samsco.org>, src-committers@freebsd.org,
	cvs-src@freebsd.org, cvs-all@freebsd.org,
	Daniel Eischen <deischen@freebsd.org>, Robert Watson <rwatson@freebsd.org>,
	David Xu <davidxu@freebsd.org>,
	Tijl Coosemans <tijl@ulyssis.org>, Xin LI <delphij@delphij.net>
Subject: Re: cvs commit: src/sys/kern kern_thr.c syscalls.master src/sys/sys
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* Matthew Dillon <dillon@apollo.backplane.com> [070820 11:43] wrote:
>     We have a lwp_kill() system call that sends a signal to a thread within
>     a process.  It turns out to be fairly necessary for any sort of heavily
>     integrated multi-threaded work.  In our case we need it to be able to
>     issue IPIs (aka SIGUSR1) to cpus within a SMP virtual kernel.
> 
>     int lwp_kill(pid_t pid, lwpid_t tid, int sig);
> 
> 						-Matt

It's always bothered me that there wasn't a generation count
included in the kill(2) interface.

What do you think about that?

It would be useful for pidfiles to ensure that a recycled pid
doesn't get a program SIGwhatever'd.

-- 
- Alfred Perlstein