Fix synchronization issues in GLDrawableHelper.flushGLRunnables(), fixes rare deadlock with animator-exception and invoke(wait=true, ..)

Fix synchronization issues in GLDrawableHelper.flushGLRunnables():
  - Querying 'glRunnables.size()' is not synchronized, only its reference is volatile,
    not the instance's own states.

  - 'flushGLRunnable()' must operates while acquired the 'glRunnable' lock.

  - 'glRunnables' are no more volatile

  - introduced volatile 'glRunnableCount', allowing 'display(..)' method
    to pre-query whether blocking 'execGLRunnables(..)' must be called.
    This is risk (deadlock) free.

Also fixes rare deadlock in animator display-exception / GLAD.invoke(wait=true, ..) case:
  - 'GLDrawableHelper.invoke(.., GLRunnable)' acquires the 'glRunnable' lock.
  - Then it queries animator state, which is blocking.
  - Hence animator's 'flushGLRunnable()' call must happen outside the animator lock

0 files changed, 0 insertions, 0 deletions