[Bug libc/13845] Infrequent random stop in futex_wait using printf inside alarm signal handler

["jon at jonshouse dot co.uk" <sourceware-bugzilla@sourceware.org>]

http://sourceware.org/bugzilla/show_bug.cgi?id=13845

--- Comment #4 from Jonathan Andrews <jon at jonshouse dot co.uk> 2012-03-14 14:55:11 UTC ---
(In reply to comment #3)
> http://pubs.opengroup.org/onlinepubs/9699919799/functions/V2_chap02.html#tag_15_04

Ok, I found the reference to the issue in an up to date man page for "signal"
on a Debian box. My older development machine does not mention it, nor does the
man page for alarm I referenced.

"unspecified" is also a pretty vague term.

Lots of nice unsafe examples via google - thanks web ....
http://www.ccplusplus.com/2011/10/alarm-function-example-in-c.html

"Interactions between alarm() and setitimer() are unspecified"
No "Only thread safe functions should be used in the alarm signal handler"

Its documented with the assumption that somebody has read it in the correct
order, the documentation isn't thread safe itself :-(

Thanks,
Jon

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