Fix concurrency bug of GLProfile initialization ; Fix SharedResourceRunner 'dead' thread (Applets)

GLDrawableFactory:
  - clarify: public getWasSharedContextCreated(..) -> protected createSharedResource(..)
  - add: getSharesResourceThread()

GLProfile:
  - proper locking of initSingletion(..) path:
    - Use RecursiveThreadGroupLock and add/remove GLDrawableFactory's sharesResourceThread
      while creating it's the sharedResource.
      This simplifies and fixes GLProfile's locking code.

  - Fix and simplify initSingleton(boolean) API doc - mark it deprecated.

  - Add initSingleton() for controlled initialization only, pairing w/ shutdown(..)

Remove initSingleton(boolean) calls in code and test!

+++

Fix SharedResourceRunner 'dead' thread (Applets)
  In Applets, stopping an Applet makes the browser Java plugin interrupting
  and killing all related threads, including our SharedResourceRunner thread.

  - Validate whether the shared resource thread is alive

  - Catch interruption in shared resource thread and assume it's a kill signal

  - releaseSharedResource: clear devicesTried set

1 files changed, 0 insertions, 2 deletions

diff --git a/src/jogl/classes/jogamp/opengl/awt/VersionApplet.java b/src/jogl/classes/jogamp/opengl/awt/VersionApplet.java
index b7c90a18b..55fb3f9a2 100644
--- a/src/jogl/classes/jogamp/opengl/awt/VersionApplet.java
+++ b/src/jogl/classes/jogamp/opengl/awt/VersionApplet.java
@@ -131,7 +131,6 @@ public class VersionApplet extends Applet {
 
   public void init() {
     System.err.println("VersionApplet: init() - begin");
-    GLProfile.initSingleton(false);
     my_init();
     System.err.println("VersionApplet: init() - end");
   }
@@ -151,7 +150,6 @@ public class VersionApplet extends Applet {
   public void destroy() {
     System.err.println("VersionApplet: destroy() - start");
     my_release();
-    GLProfile.shutdown(GLProfile.ShutdownType.SHARED_ONLY);
     System.err.println("VersionApplet: destroy() - end");
   }