[jdk17] RFR: 8269865: Async UL needs to handle ERANGE on exceeding SEM_VALUE_MAX [v7]

[Xin Liu]

> This patch solved the sempahore overflow issue with errno ERANGE or EOVERFLOW.
> Previously, we have asymmetric p/v operations for semaphore _sem. Each iteration
> only decrements _sem 1 but dequeues N messages. If logging threads keep preempting
> async logging thread, it may cause the value of _sem accumulates until overflow! 
> 
> The patch corrects the value of _sem after write(). n messages are dequeued/processed.
> We need to invoke _sem.wait() max(n-1, 1) time. This ensures that each iteration
> decrements n instead of 1.

Xin Liu has updated the pull request incrementally with one additional commit since the last revision:

  Replace counting semaphore with os::PlatformMontor.
  
  Second attempt. This patch also removed semaphore-based lock because
  PlatformMonitor can also be used as a Mutex lock.

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Changes:
  - all: https://git.openjdk.java.net/jdk17/pull/216/files
  - new: https://git.openjdk.java.net/jdk17/pull/216/files/7ac1c26c..0816eb2d

Webrevs:
 - full: https://webrevs.openjdk.java.net/?repo=jdk17&pr=216&range=06
 - incr: https://webrevs.openjdk.java.net/?repo=jdk17&pr=216&range=05-06

  Stats: 11 lines in 2 files changed: 0 ins; 4 del; 7 mod
  Patch: https://git.openjdk.java.net/jdk17/pull/216.diff
  Fetch: git fetch https://git.openjdk.java.net/jdk17 pull/216/head:pull/216

PR: https://git.openjdk.java.net/jdk17/pull/216