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 /*

  * Copyright (c) 1997, 2010, Oracle and/or its affiliates. All rights reserved.

  * DO NOT ALTER OR REMOVE COPYRIGHT NOTICES OR THIS FILE HEADER.

  *

  * This code is free software; you can redistribute it and/or modify it

  * under the terms of the GNU General Public License version 2 only, as

  * published by the Free Software Foundation.

  *

  * This code is distributed in the hope that it will be useful, but WITHOUT

  * ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or

  * FITNESS FOR A PARTICULAR PURPOSE.  See the GNU General Public License

  * version 2 for more details (a copy is included in the LICENSE file that

  * accompanied this code).

  *

  * You should have received a copy of the GNU General Public License version

  * 2 along with this work; if not, write to the Free Software Foundation,

  * Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA.

  *

  * Please contact Oracle, 500 Oracle Parkway, Redwood Shores, CA 94065 USA

  * or visit www.oracle.com if you need additional information or have any

  * questions.

  *

  */

 #ifndef OS_WINDOWS_VM_OS_WINDOWS_HPP

 #define OS_WINDOWS_VM_OS_WINDOWS_HPP

 // Win32_OS defines the interface to windows operating systems

 class win32 {

  protected:

   static int    _vm_page_size;

   static int    _vm_allocation_granularity;

   static int    _processor_type;

   static int    _processor_level;

   static julong _physical_memory;

   static size_t _default_stack_size;

   static bool   _is_nt;

   static bool   _is_windows_2003;

  public:

   // Windows-specific interface:

   static void   initialize_system_info();

   static void   setmode_streams();

   // Processor info as provided by NT

   static int processor_type()  { return _processor_type;  }

   // Processor level may not be accurate on non-NT systems

   static int processor_level() {

     assert(is_nt(), "use vm_version instead");

     return _processor_level;

   }

   static julong available_memory();

   static julong physical_memory() { return _physical_memory; }

  public:

   // Generic interface:

   // Trace number of created threads

   static          intx  _os_thread_limit;

   static volatile intx  _os_thread_count;

   // Tells whether the platform is NT or Windown95

   static bool is_nt() { return _is_nt; }

   // Tells whether the platform is Windows 2003

   static bool is_windows_2003() { return _is_windows_2003; }

   // Returns the byte size of a virtual memory page

   static int vm_page_size() { return _vm_page_size; }

   // Returns the size in bytes of memory blocks which can be allocated.

   static int vm_allocation_granularity() { return _vm_allocation_granularity; }

   // Read the headers for the executable that started the current process into

   // the structure passed in (see winnt.h).

   static void read_executable_headers(PIMAGE_NT_HEADERS);

   // Default stack size for the current process.

   static size_t default_stack_size() { return _default_stack_size; }

 #ifndef _WIN64

   // A wrapper to install a structured exception handler for fast JNI accesors.

   static address fast_jni_accessor_wrapper(BasicType);

 #endif

   // filter function to ignore faults on serializations page

   static LONG WINAPI serialize_fault_filter(struct _EXCEPTION_POINTERS* e);

 };

 class PlatformEvent : public CHeapObj {

   private:

     double CachePad [4] ;   // increase odds that _Event is sole occupant of cache line

     volatile int _Event ;

     HANDLE _ParkHandle ;

   public:       // TODO-FIXME: make dtor private

     ~PlatformEvent() { guarantee (0, "invariant") ; }

   public:

     PlatformEvent() {

       _Event   = 0 ;

       _ParkHandle = CreateEvent (NULL, false, false, NULL) ;

       guarantee (_ParkHandle != NULL, "invariant") ;

     }

     // Exercise caution using reset() and fired() - they may require MEMBARs

     void reset() { _Event = 0 ; }

     int  fired() { return _Event; }

     void park () ;

     void unpark () ;

     int  park (jlong millis) ;

 } ;

 class PlatformParker : public CHeapObj {

   protected:

     HANDLE _ParkEvent ;

   public:

     ~PlatformParker () { guarantee (0, "invariant") ; }

     PlatformParker  () {

       _ParkEvent = CreateEvent (NULL, true, false, NULL) ;

       guarantee (_ParkEvent != NULL, "invariant") ;

     }

 } ;

 #endif // OS_WINDOWS_VM_OS_WINDOWS_HPP