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Re: [gpsd-dev] Hang on Linux/Ubuntu
From: |
Greg Troxel |
Subject: |
Re: [gpsd-dev] Hang on Linux/Ubuntu |
Date: |
Wed, 11 Feb 2015 08:45:34 -0500 |
User-agent: |
Gnus/5.130006 (Ma Gnus v0.6) Emacs/24.4 (berkeley-unix) |
"Eric S. Raymond" <address@hidden> writes:
> Yes. git pull and try again. I just fixed a problem that caused a
> repeatable
> hang on Frank Nicholas's Mac OS X machine.
>
> Annoyingly, I still don't understand exactly why the problem was a
> problem. The test frame used to write "# EOF\n" to gpsd when it
> detected that the last sentence of the test load had been sent, but
> for some unknown reason doing this did not unstick the select(2) call
> in gpsd's main loop under Mac OS X.
>
> I had a feeling that might cause some sort of timing issue and changed
> it to append "# EOF\n" to the test load when it's first built (if the
> -1 option is on) That made the tests all work, and I think it likely
> to do the same thing for other *BSDs, but...
>
> ...I don't know why. There's some wacky interaction between select(2),
> delays, and input timing that I don't grok, and it's variable by OS.
release-3.11-417-gc91368e passes cleanly on netbsd-6 i386 (once, which
is what I just tried).
What I was seeing was gpsfake spinning and gpsd idle.
I wonder if there was a missing fflush or something like that.
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