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Re: Weirdness in my PowerBook. /bin/ps spawned by NSTask never exits
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Re: Weirdness in my PowerBook. /bin/ps spawned by NSTask never exits


  • Subject: Re: Weirdness in my PowerBook. /bin/ps spawned by NSTask never exits
  • From: "Finlay Dobbie" <email@hidden>
  • Date: Sun, 2 Apr 2006 11:38:27 +0100

I have no idea specifically, but why are you launching NSTasks for
this (and to generate a UUID)? Use sysctl(3) (and CFUUID)...

 -- Finlay

On 02/04/06, Jerry Krinock <email@hidden> wrote:
> My app needs info about other running processes when it launches, and due to
> the limitations of NSWorkspace, I create an NSTask to do
>
> /bin/ps -xca -o pid -o command -o user
>
> and then -waitUntilExit.  All in the main thread.  Released this code 6
> months ago, no problems.
>
> Today, while testing an update, I found my app hanging on -waitUntilExit.
> After much head-scratching, I launched our latest public release and it
> hangs upon launch too.  OH MY GOSH!!
>
> What could cause this?  This powerbook is otherwise running OK, except that
> I see that it has a couple dozen zombie processes named "(smbclient)" and
> "(nmblookup)".  I imagine a restart would "fix" it, but of course I want to
> nail this bug before it happens to a real user.
>
> Prior to this NSTask, the app launches another NSTask to do
> /usr/bin/uuidgen.  That task works fine.
>
> But this is some kind of Cocoa problem, because if I paste that /bin/ps...
> command into a Terminal window and hit return it works fine there.
>
> Also, if I do a "ps" in Terminal, I see that the other "ps" spawned by my
> app is indeed stuck in state (STAT) Ss, which means that it is in
> interruptible sleep, waiting for some child process to complete, and has
> made itself a session leader.  If I kill it, my app un-hangs and continues
> as expected.
>
> I'll take any little clues I can get.  Of course, I could spawn a thread to
> monitor this NSTask, time out, and notify the user of the problem.  But I
> want to say more than "DUHHHHH.  Try a restart?"
>
> Jerry Krinock
>
>
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 >Weirdness in my PowerBook. /bin/ps spawned by NSTask never exits (From: Jerry Krinock <email@hidden>)

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