JDK-8320320 : Make ObjectMonitor owner field the ThreadID
  • Type: Enhancement
  • Component: hotspot
  • Sub-Component: runtime
  • Priority: P4
  • Status: Open
  • Resolution: Unresolved
  • Submitted: 2023-11-17
  • Updated: 2024-11-05
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Other
tbdUnresolved
Related Reports
Relates :  
JDK-8338383 - Implement JEP 491: Synchronize Virtual Threads without Pinning
Relates :  
JDK-8320323 - ObjectWaiter queue for ObjectMonitors don't support virtual threads
Relates :  
JDK-8320317 - ObjectMonitor NotRunnable is not really an optimization
Description
Using the ThreadID as the owner for the ObjectMonitor makes it unambiguous for Loom, as the ThreadID is unique and the JavaThread can have different virtual threads mounted on it (ie so is not useful).
Comments
Draft PR: https://github.com/openjdk/jdk/pull/16441
17-11-2023