> On m1 mac sometimes (in very rare instance) it takes a long time to get the 
> sequencer so increasing timeout helps with that.
> Also on m1 mac sequencer got notified about the first MetaMessage twice. The 
> reason is unclear but watching for that fixes the problem. Also on Linux 
> sometimes process hangs indefinitely without finishing hold by the 
> com.sun.media.sound.MediaDispatcher. Closing the sequencer at the end of the 
> test helps with that.

Alexander Zuev has updated the pull request incrementally with one additional 
commit since the last revision:

  Making variables that accessed across different threads volatile
  The workaround for duplicate messages now changed to collect more data 
instead of making test to pass

-------------

Changes:
  - all: https://git.openjdk.org/jdk/pull/11157/files
  - new: https://git.openjdk.org/jdk/pull/11157/files/791065fb..5647db2e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=11157&range=03
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=11157&range=02-03

  Stats: 17 lines in 1 file changed: 13 ins; 0 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/11157.diff
  Fetch: git fetch https://git.openjdk.org/jdk pull/11157/head:pull/11157

PR: https://git.openjdk.org/jdk/pull/11157

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