src/hotspot/share/prims/whitebox.cpp

rev 58110 : v2.09a with 8235795, 8235931 and 8236035 extracted; rebased to jdk-14+28; merge with 8236035.patch.cr1; merge with 8235795.patch.cr1; merge with 8236035.patch.cr2; merge with 8235795.patch.cr2; merge with 8235795.patch.cr3.

*** 69,78 ****
--- 69,79 ----
  #include "runtime/interfaceSupport.inline.hpp"
  #include "runtime/javaCalls.hpp"
  #include "runtime/jniHandles.inline.hpp"
  #include "runtime/os.hpp"
  #include "runtime/sweeper.hpp"
+ #include "runtime/synchronizer.hpp"
  #include "runtime/thread.hpp"
  #include "runtime/threadSMR.hpp"
  #include "runtime/vm_version.hpp"
  #include "services/memoryService.hpp"
  #include "utilities/align.hpp"
*** 461,470 ****
--- 462,477 ----
    THROW_MSG_0(vmSymbols::java_lang_UnsupportedOperationException(), "WB_G1InConcurrentMark: G1 GC is not enabled");
  WB_END
  
  WB_ENTRY(jboolean, WB_G1StartMarkCycle(JNIEnv* env, jobject o))
    if (UseG1GC) {
+     if (AsyncDeflateIdleMonitors) {
+       // AsyncDeflateIdleMonitors needs to know when System.gc() or
+       // the equivalent is called so any special clean up can be done
+       // at a safepoint, e.g., TestHumongousClassLoader.java.
+       ObjectSynchronizer::set_is_special_deflation_requested(true);
+     }
      G1CollectedHeap* g1h = G1CollectedHeap::heap();
      if (!g1h->concurrent_mark()->cm_thread()->during_cycle()) {
        g1h->collect(GCCause::_wb_conc_mark);
        return true;
      }
*** 1416,1425 ****
--- 1423,1438 ----
    jchar* name = java_lang_String::as_unicode_string(JNIHandles::resolve(javaString), len, CHECK_false);
    return (StringTable::lookup(name, len) != NULL);
  WB_END
  
  WB_ENTRY(void, WB_FullGC(JNIEnv* env, jobject o))
+   if (AsyncDeflateIdleMonitors) {
+     // AsyncDeflateIdleMonitors needs to know when System.gc() or
+     // the equivalent is called so any special clean up can be done
+     // at a safepoint, e.g., TestHumongousClassLoader.java.
+     ObjectSynchronizer::set_is_special_deflation_requested(true);
+   }
    Universe::heap()->soft_ref_policy()->set_should_clear_all_soft_refs(true);
    Universe::heap()->collect(GCCause::_wb_full_gc);
  #if INCLUDE_G1GC
    if (UseG1GC) {
      // Needs to be cleared explicitly for G1