Commits on Oct 11, 2022

1. Support virtual threads in JVMTI Resume* and Suspend* functions …

   This PR impacts the following JVMTI functions:
   
   - [Resume|Suspend]Thread
   - [Resume|Suspend]ThreadList
   - [Resume|Suspend]AllVirtualThreads
   
   The above functions have been either implemented or updated as per the
   JVMTI doc:
   https://download.java.net/java/early_access/jdk19/docs/specs/jvmti.html
   
   Other changes:
   - Added boolean inspectingLiveVirtualThreadList to synchronize between
   [Resume|Suspend]AllVirtualThreads, JVM_VirtualThreadMountBegin-End and
   JVM_VirtualThreadUnmountBegin-End.
   - If a thread is suspended while waiting on the monitor, then the
   monitor is released after waking up and before invoking
   internalEnterVMFromJNI, where the thread will be halted until resumed.
   After resuming, the monitor is acquired again. This helps avoid
   deadlocks.
   - Added hidden field isSuspendedByJVMTI in VirtualThread to track if the
   thread was suspended in JVMTI. If isSuspendedByJVMTI is non-zero, then
   J9_PUBLIC_FLAGS_HALT_THREAD_JAVA_SUSPEND is set in carrier J9VMThread's
   publicFlags while resetting isSuspendedByJVMTI to zero. During mount,
   this suspends the thread if the thread was unmounted while JVMTI
   suspended it.
   
   Related: eclipse-openj9#15760
   
   Signed-off-by: Babneet Singh <sbabneet@ca.ibm.com>

   

   babsingh committed Oct 11, 2022
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