[RFC][Icedtea-Web]: Fix bug where you can clear cache while plugin is in use.

[Andrew Su]

> > Yes your suggestion would solve the problem about the order which
> > clearcache and marking is called. We were talking about different
> > things, I was talking about running more than one javaws/plugin in
> > an
> > environment that only gives exclusive locks.
> 
> So was I. There was a misunderstanding here. Andrew found a problem
> with my proposed 2 lock solution and we found a better one on irc.
> For the record, here's the log:

I have attached 2 patches, the first 20110317_PART_1_mark_netx_running_for_plugin_v5.patch is to make it so that we will not be able to clear cache while the plugin and/or javaws is running. On the other hand when it is clearing cache it will wait for it to finish then proceed.

The second patch 20110317_PART_2_mark_netx_running_always_get_lock.patch is to make it so that if shared locks are not available, we will begin locking small regions per jvm.

Cheers,
  Andrew

--Snip--
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