Source code

/******************************************************************************
 *
 * Copyright (c) 2015  TOSHIYUKI ARAI. ALL RIGHTS RESERVED.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions
 * are met:
 * 1. Redistributions of source code must retain the above copyright
 *    notice, this list of conditions, and the following disclaimer.
 *
 * 2. The name of the author may not be used to endorse or promote products
 *    derived from this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 * SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED TO,
 * PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR PROFITS;
 * OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY,
 * WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING NEGLIGENCE OR
 * OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF
 * ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
 *
 *
 *  Spinlock.h
 *
 *****************************************************************************/

#pragma once

#include <es++/Object.h>
#include <es++/Exception.h>
#include <pthread.h>

namespace Es {

class Spinlock :Object {
private:
  pthread_spinlock_t _lock;

public:
  Spinlock(int pshared = 0)
  :_lock(0)
  {
    // If pshared is nonzero the spinlock can
    // be shared between different processes. 

    int rc = pthread_spin_init (&_lock, pshared);
    if (rc != 0) {
      throw Es::IException("Faield to pthread_spin_init: %s", error());
    }
  }

  ~Spinlock()
  {
    pthread_spin_destroy (&_lock);
  }

  int lock()
  {
    return pthread_spin_lock (&_lock);
  }

  int tryLock()
  {
    return pthread_spin_trylock (&_lock);
  }

  int unlock()
  {
    return pthread_spin_unlock (&_lock);
  }
};
}