site_archiver@lists.apple.com Delivered-To: darwin-kernel@lists.apple.com Dkim-signature: v=1; a=rsa-sha256; c=relaxed/relaxed; d=gmail.com; s=gamma; h=domainkey-signature:mime-version:received:received:in-reply-to :references:date:message-id:subject:from:to:cc:content-type; bh=qSIgGFOD4qUzpD07gCNhN2L/2/IIG6SIw1ukiKGZ1mE=; b=Xsbhsf2UOQIAziTAHUCbZwmLySE7uywxkLPlea7m37tbDl5ZlG9HpLrENbI7Bk9RyB cVyrE/FtgzEJUMAvQ9/o37xORGvDDPyN9Xwg8sO1QSDJb4KzjdFH3wynPp78H14pUI24 uF7WXf92QYjAiEUilRqZjVSp+akk6GW2ITEfM= Domainkey-signature: a=rsa-sha1; c=nofws; d=gmail.com; s=gamma; h=mime-version:in-reply-to:references:date:message-id:subject:from:to :cc:content-type; b=XBrZp3dJEnXPXuXv0fccmncNhJ6aDXlUbDhXt9VJJOv0MPp3LHwPU6ATm6RqGa3q2L t27cUrNczijzM134J0hbuBAZcQIUrsnMitEVaopbLjLKwwAsGoZRbqUD1xZvxknmo7CA /bk0/pF1Bd6nD/1jRLc3L2nqg5SPmZTq8ul1g= On Wed, Jun 16, 2010 at 3:13 PM, Dave Keck <davekeck@gmail.com> wrote:

I mistakenly sent my last message off-list; you might want to put your reply on-list for more input.

...

Thank you for the reply. According to [1], PIDs are not reused, so I assume there's no need to worry about races with this approach.

[1] http://support.apple.com/kb/TA44156

I'm not sure what point that document is trying to make, but PIDs are most certainly reused as necessary. The only PID-reuse limitation that I'm aware of is that a PID can't be reused until its parent process has reaped it (otherwise waitpid() could fail.)

The relevant snippet is: "Every process has a process identification number (PID) that is assigned according to order it was run. The first process that runs has a PID of 1. The second has a PID of 2 and so on. If a process dies or is killed, that PID is not reused. If the computer is restarted, the process count begins at 1 again."

Perhaps you could give some details of what you're trying to accomplish?

I am using process exit notifications to clean up the list of PIDs for which traffic is filtered. Regards, Bogdan _______________________________________________ Do not post admin requests to the list. They will be ignored. Darwin-kernel mailing list (Darwin-kernel@lists.apple.com) Help/Unsubscribe/Update your Subscription: http://lists.apple.com/mailman/options/darwin-kernel/site_archiver%40lists.a... This email sent to site_archiver@lists.apple.com