Commits on Feb 3, 2023

1. Fix missing concurrent continuation scanning issue …

   The issue is caused by concurrent scavenger scanning and concurrent
   marking scanning overlap for the same continuation Object, during
   concurrent continuation scanning, the current synchronization control
   would block the continuation mounting and ignore another concurrent
   scanning, but the concurrent scavenger scanning and concurrent marking
   are irrelevant, ignore another could cause missing scanning and the
   related "live" object is recycled.
   
   - updated J9VMContinuation->state, use two low bits for recording
    concurrentScanning(bit0 for concurrentScanningLocal and bit1 for
    concurrentScanningGlobal) instead of only one low bit.
   
   - pass flag isConcurrentGC and flag isGlobalGC for
   GC_VMThreadStackSlotIterator::scanSlots().
   
   - handle J9_GC_CONTINUATION_STATE_CONCURRENT_SCAN_LOCAL and
   J9_GC_CONTINUATION_STATE_CONCURRENT_SCAN_GLOBAL independently
   
   - only both J9_GC_CONTINUATION_STATE_CONCURRENT_SCAN_LOCAL and
   J9_GC_CONTINUATION_STATE_CONCURRENT_SCAN_GLOBAL bits has been cleared
   we can notify blocked the continuation mounting thread.
   
   Signed-off-by: Lin Hu <linhu@ca.ibm.com>

   

   LinHu2016 committed Feb 3, 2023
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