/*

 * 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