Re: [path][rfc] add PR_DETACH prctl command

From: Stas Sergeev
Date: Fri Apr 08 2011 - 17:39:36 EST

09.04.2011 01:25, Bryan Donlan wrote:
Using dlopen will allow you to perform the fork() prior to running the
library's initialization code.
But I don't even need that: I init it manually, there
is no automatic ctors there.

As I said, I can't comment on the patch - I'm not familiar with that
part of the kernel, so I don't know what kind of races may be lurking.
But based on Oleg's comments, it seems clear to me that implementing
your PR_DETACH is quite a complex thing to be doing.
Yes, that's true, but treat that as my personal tour to the
kernel internals. I wasn't realizing the complexity initially,
and now its almost done, so I wonder what the result will
look like, it will it worth all the troubles.

It is true that
being able to daemonize() without losing threads would be a nice thing
to have; I just have my doubts that it's worth the potential bugs that
such a change might introduce, when it's only needed in a somewhat
rare case, and when perfectly good workarounds exist in userspace.
Yes, I share that concerns too. And it is very unlikely that
I will propose that patch for inclusion, but I think it is possible
to code that up small and simple, in which case maybe even
Oleg will not hate it all that much. ;))
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