On Fri, 28 Jul 2023 09:11:07 GMT, Jose Pereda <jper...@openjdk.org> wrote:

> This PR adds a file lock to the cache directory, allowing access from 
> multiple processes (that is, from more than one JVM) to that directory. 
> 
> This helps solving the issue where the cache is empty or doesn't exist yet, 
> and two JavaFX applications start at the same time, and both try to copy the 
> same native libraries to the same cache.
> 
> No tests have been added to the PR though, since this requires a complex 
> scenario: building the SDK and publishing to local Maven repository, creating 
> two simple JavaFX applications that use those artifacts, using a temporary 
> folder for cache (via `javafx.cachedir`, and launching in parallel both 
> applications.
> 
> I've tested successfully such scenario on Linux, Mac and Windows.

Would it still fail if an earlier JVM tries to write to the cache dir?

Just a wild idea: what if we double-check (the file hash?) after writing files 
or something like that?  I know, that still won't help if an older JVM writes 
to the same dir...

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PR Comment: https://git.openjdk.org/jfx/pull/1188#issuecomment-1655863051

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