If so that's exactly what the read/write lock and then the read/write lock manager does.
Oliver On Apr 1, 2005 6:30 PM, Oliver Zeigermann <[EMAIL PROTECTED]> wrote: > Still not quite clear, most likely because I am a bit dumb ;) What is > the use of your kind of upgrade lock? Or is it that you want > preference of the write lock over read locks, i.e. when more than one > party is waiting for a lock, the one waiting for the write lock gets > preference? > > Oliver > > > On Apr 1, 2005 9:31 AM, [EMAIL PROTECTED] <[EMAIL PROTECTED]> wrote: > > Hi, > > > > Selon Oliver Zeigermann <[EMAIL PROTECTED]>: > > > Hmmm, not quite sure that I get this all right, but to me it seems you > > > describe the simple read/write locks (without the upgrade step). Is > > > that possible? If so you could simply use the ReadWriteLockManager. > > > > My lock manager has not exactly the same behaviour as the > > ReadWriteLockManager > > and I think looks more like the ReadWriteUpgardeLockManager. > > > > I will try to explain what I want to do ;o) > > > > In my case : > > * Read access requires a shared lock (S). > > * Write access requires an exclusive lock (X). > > * An upgrade lock (U) supports read with (potential) write access and > > prevents > > further shared locks (S) for the same object. An upgrade lock (U) can be > > converted to an exclusive lock (X) after the release of the existing shared > > locks or back to a shared lock if no update action is needed (time out). > > > > So, the difference is when I have an upgrade lock on a data, it is > > impossible to > > obtain shared locks, but locks that are already granted keep going on. With > > the > > exclusive lock no other locks can be obtained or exist on the same data. > > > > I expect it's more clear? > > > > Is it possible to transform the ReadWriteUpgradeLockManager to obtain this ? > > > > Thanks for your help, > > > > Mel > > > > --------------------------------------------------------------------- > > To unsubscribe, e-mail: [EMAIL PROTECTED] > > For additional commands, e-mail: [EMAIL PROTECTED] > > > > > --------------------------------------------------------------------- To unsubscribe, e-mail: [EMAIL PROTECTED] For additional commands, e-mail: [EMAIL PROTECTED]
