Re: threading question?

[Andreas Jaeger]

Roger Davenport <address@hidden> writes:

> Hi,
>
> This isn't really a bug, but I am wondering if glibc functions like
> sprintf, printf, etc are all pthread locking? (when used with
> LinuxThreads 0.9)  I can understand the need (for instance, printf needs
> to lock on stdout) but wonder if there is a way to disable it for
> programs that are smart enough to handle their own locking.
>
> I ran a gprof on my code and noticed that sprintf was locking like a
> horse, even though the target buffer was static to the thread.  I don't
> know if gcc/glibc is smart enough to understand statics in threads, but
> my guess is no.

Check __fsetlocking as part of <stdio-ext.h>, it should be documented
in the libc manual,

Andreas
-- 
 Andreas Jaeger
  SuSE Labs address@hidden
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    http://www.suse.de/~aj