Fix stop-the-world race.

Added a VMOp_ThirdPartyHeapOperation for the third-party heap to perform stop-the-world GC. SafepointSynchronize::begin() no longer report "thread has stopped" to the third-party heap. Instead the third-party heap should scan stacks during stop-the-world.
mmtk · Sep 22, 2021 · a395aa6 · a395aa6
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commit a395aa6
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diff --git a/src/hotspot/share/runtime/safepoint.cpp b/src/hotspot/share/runtime/safepoint.cpp
@@ -294,7 +294,6 @@ void SafepointSynchronize::begin() {
             cur_state->examine_state_of_thread();
             if (!cur_state->is_running()) {
               still_running--;
-              Universe::heap()->report_java_thread_yield(cur);
               // consider adjusting steps downward:
               //   steps = 0
               //   steps -= NNN

diff --git a/src/hotspot/share/runtime/vmOperations.hpp b/src/hotspot/share/runtime/vmOperations.hpp
@@ -130,6 +130,7 @@
   template(PrintMetadata)                         \
   template(GTestExecuteAtSafepoint)               \
   template(JFROldObject)                          \
+  template(ThirdPartyHeapOperation)               \
 
 class VM_Operation: public CHeapObj<mtInternal> {
  public: