src/hotspot/share/runtime/os.hpp

*** 133,142 ****
--- 133,144 ----
                               bool allow_exec);
    static bool   pd_unmap_memory(char *addr, size_t bytes);
    static void   pd_free_memory(char *addr, size_t bytes, size_t alignment_hint);
    static void   pd_realign_memory(char *addr, size_t bytes, size_t alignment_hint);
  
+   static size_t pd_committed_stack_size(address bottom, size_t size);
+ 
    static size_t page_size_for_region(size_t region_size, size_t min_pages, bool must_be_aligned);
  
    // Get summary strings for system information in buffer provided
    static void  get_summary_cpu_info(char* buf, size_t buflen);
    static void  get_summary_os_info(char* buf, size_t buflen);
*** 266,275 ****
--- 268,281 ----
    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();