/*
 * Copyright (c) 2015, 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 SHARE_VM_UTILITIES_SEMAPHORE_HPP
#define SHARE_VM_UTILITIES_SEMAPHORE_HPP

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

#define IMPLEMENTS_SEMAPHORE_CLASS 1

#if defined(TARGET_OS_FAMILY_bsd)
# include "semaphore_bsd.hpp"
#elif defined(TARGET_OS_FAMILY_linux)
# include "semaphore_linux.hpp"
#elif defined(TARGET_OS_FAMILY_solaris)
# include "semaphore_solaris.hpp"
#elif defined(TARGET_OS_FAMILY_windows)
# include "semaphore_windows.hpp"
#else
  // Redefine for platforms that don't implement the Semaphore class.
# undef  IMPLEMENTS_SEMAPHORE_CLASS
# define IMPLEMENTS_SEMAPHORE_CLASS 0
#endif

#if IMPLEMENTS_SEMAPHORE_CLASS

class Semaphore : public CHeapObj<mtInternal> {
 public:
  static const uint NoMaxCount = (uint)-1;

  Semaphore(uint value = 0, uint max = NoMaxCount);
  ~Semaphore();
  void signal();
  void signal(uint count);
  void wait();
  bool trywait();
  bool timedwait(unsigned int sec, int nsec);
 private:
  os_semaphore_t _semaphore;
};

#endif

#endif // SHARE_VM_UTILITIES_SEMAPHORE_HPP