src/share/vm/utilities/accessFlags.cpp

rev 6875 : 8056240: Investigate increased GC remark time after class unloading changes in CRM Fuse
Reviewed-by: mgerdin, coleenp, bdelsart

@@ -60,10 +60,25 @@
     new_flags = old_flags & ~bits;
     f = Atomic::cmpxchg(new_flags, &_flags, old_flags);
   } while(f != old_flags);
 }
 
+// Returns true iff this thread succeeded setting the bit.
+bool AccessFlags::atomic_set_one_bit(jint bit) {
+  // Atomically update the flags with the bit given
+  jint old_flags, new_flags, f;
+  bool is_setting_bit = false;
+  do {
+    old_flags = _flags;
+    new_flags = old_flags | bit;
+    is_setting_bit = old_flags != new_flags;
+    f = Atomic::cmpxchg(new_flags, &_flags, old_flags);
+  } while(f != old_flags);
+
+  return is_setting_bit;
+}
+
 #if !defined(PRODUCT) || INCLUDE_JVMTI
 
 void AccessFlags::print_on(outputStream* st) const {
   if (is_public      ()) st->print("public "      );
   if (is_private     ()) st->print("private "     );