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Paul Higinbotham
1962c273c6
CoreCLR doesn't call finalizer on process exit. PowerShell relies on the CLR finalizer to clean up state on exit. In this case, a Runspace pool was not closed or disposed and any pipeline worker threads created to run concurrent scripts won't end, causing the hang. The same thing can happen if any individual Runspace is created to run a concurrent script and is not closed. We cannot use the `AppDomain.DomainUnload` event because it's not supported by the default load context. The `AppDomain.ProcessExit` event is also not helpful since it is only called during application exit which means threads already have to be cleaned up. The fix introduces a static property called `PrimaryRunspace` to `Runspace`. When the PrimaryRunspace is closing it means that the PowerShell session is ending and on exit clean should be performed. The static property `PrimaryRunspace` can only be set once per process.