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Datei: mutex_windows.hpp Sprache: C

/*
* Copyright (c) 1997, 2022, 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_MUTEX_WINDOWS_HPP
#define OS_WINDOWS_MUTEX_WINDOWS_HPP

#include "memory/allocation.hpp"
#include "utilities/debug.hpp"
#include "utilities/globalDefinitions.hpp"

// Platform specific implementations that underpin VM Mutex/Monitor classes.
// Note that CRITICAL_SECTION supports recursive locking, while the semantics
// of the VM Mutex class does not. It is up to the Mutex class to hide this
// difference in behaviour.

class PlatformMutex : public CHeapObj<mtSynchronizer> {
  NONCOPYABLE(PlatformMutex);

protected:
  CRITICAL_SECTION   _mutex; // Native mutex for locking

public:
  PlatformMutex();
  ~PlatformMutex();
  void lock();
  void unlock();
  bool try_lock();
};

class PlatformMonitor : public PlatformMutex {
private:
  CONDITION_VARIABLE _cond;  // Native condition variable for blocking
  NONCOPYABLE(PlatformMonitor);

public:
  PlatformMonitor();
  ~PlatformMonitor();
  int wait(jlong millis);
  void notify();
  void notify_all();
};

#endif // OS_WINDOWS_MUTEX_WINDOWS_HPP

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