src/hotspot/share/runtime/thread.hpp

rev 56635 : v2.00 -> v2.05 (CR5/v2.05/8-for-jdk13) patches combined into one; merge with 8229212.patch; merge with jdk-14+11; merge with 8230184.patch; merge with 8230876.patch; merge with jdk-14+15; merge with jdk-14+18.
rev 56637 : Add OM_CACHE_LINE_SIZE so that ObjectMonitor cache line sizes can be experimented with independently of DEFAULT_CACHE_LINE_SIZE; for SPARC and X64 configs that use 128 for DEFAULT_CACHE_LINE_SIZE, we are experimenting with 64; move _previous_owner_tid and _allocation_state fields to share the cache line with ObjectMonitor::_header; put ObjectMonitor::_ref_count on its own cache line after _owner; add 'int* count_p' parameter to deflate_monitor_list() and deflate_monitor_list_using_JT() and push counter updates down to where the ObjectMonitors are actually removed from the in-use lists; monitors_iterate() async deflation check should use negative ref_count; add 'JavaThread* target' param to deflate_per_thread_idle_monitors_using_JT() add deflate_common_idle_monitors_using_JT() to make it clear which JavaThread* is the target of the work and which is the calling JavaThread* (self); g_free_list, g_om_in_use_list and g_om_in_use_count are now static to synchronizer.cpp (reduce scope); add more diagnostic info to some assert()'s; minor code cleanups and code motion; save_om_ptr() should detect a race with a deflating thread that is bailing out and cause a retry when the ref_count field is not positive; merge with jdk-14+11; add special GC support for TestHumongousClassLoader.java; merge with 8230184.patch; merge with jdk-14+14; merge with jdk-14+18.
rev 56638 : Merge the remainder of the lock-free monitor list changes from v2.06 with v2.06a and v2.06b after running the changes through the edit scripts; merge pieces from dcubed.monitor_deflate_conc.v2.06d in dcubed.monitor_deflate_conc.v2.06[ac]; merge pieces from dcubed.monitor_deflate_conc.v2.06e into dcubed.monitor_deflate_conc.v2.06c; merge with jdk-14+11; test work around for test/jdk/tools/jlink/multireleasejar/JLinkMultiReleaseJarTest.java should not been needed anymore; merge with jdk-14+18.

@@ -412,15 +412,15 @@
   // ObjectMonitor on which this thread called Object.wait()
   ObjectMonitor* _current_waiting_monitor;
 
   // Per-thread ObjectMonitor lists:
  public:
-  ObjectMonitor* om_free_list;                  // SLL of free ObjectMonitors
-  int om_free_count;                            // # on om_free_list
+  ObjectMonitor* volatile om_free_list;         // SLL of free ObjectMonitors
+  volatile int om_free_count;                   // # on om_free_list
   int om_free_provision;                        // # to try to allocate next
-  ObjectMonitor* om_in_use_list;                // SLL of in-use ObjectMonitors
-  int om_in_use_count;                          // # on om_in_use_list
+  ObjectMonitor* volatile om_in_use_list;       // SLL of in-use ObjectMonitors
+  volatile int om_in_use_count;                 // # on om_in_use_list
 
 #ifdef ASSERT
  private:
   volatile uint64_t _visited_for_critical_count;
 

@@ -522,11 +522,10 @@
   void set_native_thread_name(const char *name) {
     assert(Thread::current() == this, "set_native_thread_name can only be called on the current thread");
     os::set_native_thread_name(name);
   }
 
-  ObjectMonitor** om_in_use_list_addr()          { return (ObjectMonitor **)&om_in_use_list; }
   Monitor* SR_lock() const                       { return _SR_lock; }
 
   bool has_async_exception() const { return (_suspend_flags & _has_async_exception) != 0; }
 
   inline void set_suspend_flag(SuspendFlags f);