src/hotspot/share/runtime/os.hpp

*** 269,278 ****
--- 269,282 ----
    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();