src/hotspot/share/runtime/os.hpp

@@ -269,10 +269,14 @@
   static bool uses_stack_guard_pages();
   static bool must_commit_stack_guard_pages();
   static void map_stack_shadow_pages(address sp);
   static bool stack_shadow_pages_available(Thread *thread, const methodHandle& method, address sp);
 
+  // Return size of stack that is actually committed. For Java thread, the bottom should be above
+  // guard pages (stack grows downward)
+  static size_t committed_stack_size(address bottom, size_t size);
+
   // OS interface to Virtual Memory
 
   // Return the default page size.
   static int    vm_page_size();