/*

 * 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 OS_BSD_VM_SEMAPHORE_BSD_HPP

#define OS_BSD_VM_SEMAPHORE_BSD_HPP

#ifndef __APPLE__

// Use POSIX semaphores.

# include "semaphore_posix.hpp"

#else

// OS X doesn't support unamed POSIX semaphores, so the implementation in os_posix.cpp can't be used.

# include "memory/allocation.hpp"

# include <mach/semaphore.h>

class OSXSemaphore : public CHeapObj<mtInternal>{

  semaphore_t _semaphore;

  // Prevent copying and assignment.

  OSXSemaphore(const OSXSemaphore&);

  OSXSemaphore& operator=(const OSXSemaphore&);

 public:

  OSXSemaphore(uint value = 0);

  ~OSXSemaphore();

  void signal(uint count = 1);

  void wait();

  bool trywait();

  bool timedwait(unsigned int sec, int nsec);

 private:

  static jlong currenttime();

};

typedef OSXSemaphore SemaphoreImpl;

#endif // __APPLE__

#endif // OS_BSD_VM_SEMAPHORE_BSD_HPP