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On 9/7/10 14:43 , Gaius Hammond wrote:
On 7 Sep 2010, at 18:46, Bryan O'Sullivan wrote:
If you are using HDBC-mysql or HDBC-odbc to access MySQL databases, you
may have run into problems with your programs failing due to connection
errors. In this blog posting, I describe what's happening and how to work
around it:
http://www.serpentine.com/blog/2010/09/04/dealing-with-fragile-c-libraries-e-g-mysql-from-haskell/
Interestingly a similar issue was posted recently on Hacker
News: http://news.ycombinator.com/item?id=1661986
BSD (CSRG) UNIX had restartable system calls (no EINTR except from select(),
which you had to use if you wanted to be interruptible under some
circumstances which I'm not recalling off the top of my head right now; more
than a few programs that didn't follow the rules turned out to not support
any kind of interruptibility until rewritten to use select()). ATT
commercial UNIX kept the original Research Edition UNIX EINTR semantics.
POSIX had to reconcile them; the decision was to go with EINTR (you can
simulate restartable system calls by looping on EINTR, but if restartable
system calls are the default the only way to escape them is to rewire the
program to use select() as above) but systems could offer sigaction() flag
SA_RESTARTHAND to enable system call restarting on a signal-by-signal basis.
(Note that SA_RESTARTHAND is not required for compliance, but a compliant
system with SA_RESTARTHAND must have compliant semantics for it or call it
something else.)
- --
brandon s. allbery [linux,solaris,freebsd,perl] allb...@kf8nh.com
system administrator [openafs,heimdal,too many hats] allb...@ece.cmu.edu
electrical and computer engineering, carnegie mellon university KF8NH
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