Jim Douglas <email@hidden> wrote:
>(Re-sent without a file attachment...are messages with attachments
>blocked from the list?)
No, but the attachments are stripped.
>Any suggestions would be very much appreciated...I'm lost.
Is your sample code supposed to be just a demonstration of the problem,
or an example of what you're trying to accomplish with locks?
I ask because your code falls back to opening a file read-only when it can't
open it R/W. But a file opened read-only doesn't need a lock, so if you're
going to fall back to R/O access, then you should also fall back to
omitting the lock. Or maybe I'm misunderstanding what the point is.
Your comment in the code:
// My understanding is that this should be true on most platforms, however, I
// cannot figure out how to upgrade a shared lock to exclusive, which would be
// needed on file lock is this was false.
See the API docs for FileLock.
<http://java.sun.com/j2se/1.4.2/docs/api/java/nio/channels/FileLock.html>
They clearly explain that locks are platform-dependent. Locks are a thin
layer on whatever a platform offers natively, and you have to take what is
available on each platform. There is no universal portable semantics for
locks, and you should therefore write your lock-using programs to be
adaptable, rather than assuming that lock behavior is universal.
-- GG
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