I've got quite a bit of code that does flock() on files in AFS, but I've
always worked under the assumption that this would only work if a single
client is doing the writing. I don't recall whether that assumption was
based on empirical testing, reading it somewhere, or being told. In
those few cases where this is not practical, I have a designated writer
client that other clients connect to through other means (sockets) and
coordinate the updates that way. That's reasonably straightforward, but
painful enough that I avoid it whenever possible.
Probably not the answer you wanted...
--
[EMAIL PROTECTED]
On 10/27/2008 12:16 PM, Hans-Werner Paulsen wrote:
Hello,
today I am totally confused how the flock(2) call should work on
AFS files.
Normally locking works in the following way:
1 fd = open("afs-file",O_RDWR)
do something
2 flock(fd,LOCK_EX)
do something with "afs-file"
3 flock(fd,LOCK_UN)
do something
4 close(fd)
When there are two processes (on different machines) executing that
code, the (2) flock call has to update the local copy of the afs-file,
otherwise locking is useless. And the (3) flock call has to sync the
local copy with the fileserver.
Writing a small test program I see that this synchronization isn't done.
How can I use the flock(2) call on AFS files?
Thank you for any help,
HW
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