8271513: support JavaThreadIteratorWithHandle replacement by new Thre…

…adsList::Iterator

Co-authored-by: Kim Barrett <kbarrett@openjdk.org>
Reviewed-by: kbarrett, dholmes, coleenp

src/hotspot/share/runtime/thread.cpp

@@ -854,7 +854,7 @@ void JavaThread::collect_counters(jlong* array, int length) {
   for (int i = 0; i < length; i++) {
     array[i] = _jvmci_old_thread_counters[i];
   }
-  for (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) {
+  for (JavaThread* tp : ThreadsListHandle()) {
     if (jvmci_counters_include(tp)) {
       for (int i = 0; i < length; i++) {
         array[i] += tp->_jvmci_counters[i];
@@ -915,7 +915,7 @@ class VM_JVMCIResizeCounters : public VM_Operation {
     }
 
     // Now resize each threads array
-    for (JavaThreadIteratorWithHandle jtiwh; JavaThread *tp = jtiwh.next(); ) {
+    for (JavaThread* tp : ThreadsListHandle()) {
       if (!tp->resize_counters(JVMCICounterSize, _new_size)) {
         _failed = true;
         break;

src/hotspot/share/runtime/threadSMR.hpp

@@ -328,6 +328,10 @@ class ThreadsListHandle : public StackObj {
     return _list_ptr.list();
   }
 
+  using Iterator = ThreadsList::Iterator;
+  inline Iterator begin();
+  inline Iterator end();
+
   template <class T>
   void threads_do(T *cl) const {
     return list()->threads_do(cl);

src/hotspot/share/runtime/threadSMR.inline.hpp

@@ -107,6 +107,9 @@ inline void ThreadsList::threads_do(T *cl) const {
   }
 }
 
+ThreadsListHandle::Iterator ThreadsListHandle::begin() { return list()->begin(); }
+ThreadsListHandle::Iterator ThreadsListHandle::end() { return list()->end(); }
+
 // These three inlines are private to ThreadsSMRSupport, but
 // they are called by public inline update_tlh_stats() below: