/*

 * 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

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 *

 */

#ifndef OS_POSIX_VM_SEMAPHORE_POSIX_HPP

#define OS_POSIX_VM_SEMAPHORE_POSIX_HPP

#include "memory/allocation.hpp"

#include <semaphore.h>

class PosixSemaphore : public CHeapObj<mtInternal> {

  sem_t _semaphore;

  // Prevent copying and assignment.

  PosixSemaphore(const PosixSemaphore&);

  PosixSemaphore& operator=(const PosixSemaphore&);

 public:

  PosixSemaphore(uint value = 0);

  ~PosixSemaphore();

  void signal(uint count = 1);

  void wait();

  bool trywait();

  bool timedwait(unsigned int sec, int nsec) {

    return timedwait(create_timespec(sec, nsec));

  }

 private:

  bool timedwait(struct timespec ts);

  // OS specific implementation to create a timespec suitable for semaphores.

  struct timespec create_timespec(unsigned int set, int nsec);

};

typedef PosixSemaphore SemaphoreImpl;

#endif // OS_POSIX_VM_SEMAPHORE_POSIX_HPP