Re: [Myghty-users] generalized global resources in myghty

[Deron M. <der...@gm...>]

On 9/16/05, mike bayer <mi...@my...> wrote:
> so, the reasonably easy approach of having all the processes/threads
> maintain open filehandles on the logfile, and they all just use flock() o=
n
> a common lockfile (or the logfile itself?) to synchronize against each
> other, should do the trick.  right ?  i.e. theres no problem with multipl=
e
> processes having a write handle on a file at the same time as long as the=
y
> play nicely timing-wise.

Yes, that should work quite reliably and is perhaps the easiest most
portable way.  There's no problem with multiple writers.  Remember to
use try:...finally: blocks to help make sure you don't accidentally
deadlock yourself.

Note that if you are writing to an NFS filesystem file locking may not
work depending on mounting options and whether the lockd
daemon is running on the server.  Keep it on a local filesystem
and you'll be fine.

If you're in a high performance situation then you may need to use
something much more sophisticated (but also way more complex)
to deal with fair scheduling and so forth.  flock should be fine for
most cases though.
--=20
Deron Meranda