<AWT Dev> RFR: JDK-8244088: [Regression] Switch of Gnome theme ends up in deadlocked UI

[Sergey Bylokhov]

On Thu, 29 Oct 2020 13:14:49 GMT, Jayashree S Kumar <github.com+31532647+jaysk1 at openjdk.org> wrote:

> Issue
> 
> https://bugs.openjdk.java.net/browse/JDK-8244088
> 
> Problem
> 
> While using GTK3 java implementation,  User sees a deadlock issue in UI while trying to switch themes in gnome-tweak-tool.

src/java.desktop/unix/native/libawt_xawt/awt/swing_GTKEngine.c line 353:

> 351:         JNIEnv *env, jobject this)
> 352: {
> 353:     // Note that gtk->flush_event_loop takes care of locks (7053002)

Different people used these methods (gdk_threads_enter/gdk_threads_leave) here twice which caused two regressions. Looks like the comment about locks is not enough. Could you please update the comment and state that gdk_threads_enter/gdk_threads_leave must not be used here?

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PR: https://git.openjdk.java.net/jdk/pull/932