/*

 * Copyright (c) 2015, 2019, 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

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 *

 */

#ifndef SHARE_RUNTIME_SEMAPHORE_HPP

#define SHARE_RUNTIME_SEMAPHORE_HPP

#include "memory/allocation.hpp"

#if defined(LINUX) || defined(SOLARIS) || defined(AIX)

# include "semaphore_posix.hpp"

#elif defined(BSD)

# include "semaphore_bsd.hpp"

#elif defined(_WINDOWS)

# include "semaphore_windows.hpp"

#else

# error "No semaphore implementation provided for this OS"

#endif

class JavaThread;

// Implements the limited, platform independent Semaphore API.

class Semaphore : public CHeapObj<mtSynchronizer> {

  SemaphoreImpl _impl;

  // Prevent copying and assignment of Semaphore instances.

  Semaphore(const Semaphore&);

  Semaphore& operator=(const Semaphore&);

 public:

  Semaphore(uint value = 0) : _impl(value) {}

  ~Semaphore() {}

  void signal(uint count = 1) { _impl.signal(count); }

  void wait()                 { _impl.wait(); }

  bool trywait()              { return _impl.trywait(); }

  void wait_with_safepoint_check(JavaThread* thread);

};

#endif // SHARE_RUNTIME_SEMAPHORE_HPP