> Hi,
> 
> Please find here a change that fixes a potential race condition in  
> SSLTube.SSLSubscriptionWrapper.
> Typically the race may get triggered if the  demand increased by request() is 
> not exhausted by the time 
> the subscription is switched by setSubscription.
> 
> Some synchronization is required to present a consistent view of the 
> subscripton state, so that pending demand can be consistently transferred to 
> the new the subscription.
> 
> This mostly affects HTTP/1.1 over TLS since each new exchange will cause the 
> subscription to be switched to the new exchange. The race condition is 
> elusive and hard to reproduce. when it occurs, it mostly causes tests to fail 
> in jtreg timeout as the demand from upstream may not be transferred properly. 
> 
> Some additional logging has been added to the DigestEchoClient.java test 
> class (which is used by DigestEchoClientSSL) to help diagnosability of 
> intermittent failures in these tests.

Daniel Fuchs has updated the pull request incrementally with one additional 
commit since the last revision:

  Review feedback

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

Changes:
  - all: https://git.openjdk.org/jdk/pull/23515/files
  - new: https://git.openjdk.org/jdk/pull/23515/files/acf81c1a..18aaa85e

Webrevs:
 - full: https://webrevs.openjdk.org/?repo=jdk&pr=23515&range=01
 - incr: https://webrevs.openjdk.org/?repo=jdk&pr=23515&range=00-01

  Stats: 5 lines in 1 file changed: 0 ins; 1 del; 4 mod
  Patch: https://git.openjdk.org/jdk/pull/23515.diff
  Fetch: git fetch https://git.openjdk.org/jdk.git pull/23515/head:pull/23515

PR: https://git.openjdk.org/jdk/pull/23515

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