geode-client-native/src/cppcache/impl/AtomicInc.hpp

/*=========================================================================
 * Copyright (c) 2010-2014 Pivotal Software, Inc. All Rights Reserved.
 * This product is protected by U.S. and international copyright
 * and intellectual property laws. Pivotal products are covered by
 * one or more patents listed at http://www.pivotal.io/patents.
 *=========================================================================
 */
#ifndef _GEMFIRE_IMPL_ATOMICINC_HPP_
#define _GEMFIRE_IMPL_ATOMICINC_HPP_

#include "../gfcpp_globals.hpp"

#include "HostAsm.hpp"

namespace gemfire {


/**
 * @brief Atomic type wrapper for thread safe arithmetic limited to addition.
 */
class CPPCACHE_EXPORT AtomicInc
{
  private:
  
  volatile int32_t m_value;
  
  public:
  
  /** @brief Initialize m_value to c. */
  AtomicInc (const int32_t c=0) 
    : m_value(c)
  { }
  /** @brief reset m_value to c. */
  void resetValue (const int32_t c=0) 
  { 
    m_value = c;
  }

  /** @brief  Atomically pre-increment m_value. */
  int32_t operator++ (void)
  {
    // return ++m_value;
    return HostAsm::atomicAdd( m_value, 1 );
  }

  /** @brief  Atomically post-increment m_value. */
  int32_t operator++ (int) 
  {
    // return m_value++;
    return HostAsm::atomicAddPostfix( m_value, 1 );
  }

  /** @brief  Atomically increment m_value by rhs. */
  int32_t operator+= (const int32_t &rhs)
  {
    // return m_value += rhs;
    return HostAsm::atomicAdd( m_value, rhs );
  }

  /** @brief  Atomically pre-decrement m_value. */
  int32_t operator-- (void)
  {
    // return --m_value;
    return HostAsm::atomicAdd( m_value, -1 );
  }

  /** @brief  Atomically post-decrement m_value. */
  int32_t operator-- (int)
  {
    // return m_value--;
    return HostAsm::atomicAddPostfix( m_value, -1 );
  }

  /** @brief  Atomically decrement m_value by rhs. */
  int32_t operator-= (const int32_t &rhs)
  {
    // return m_value -= rhs;
    return HostAsm::atomicAdd( m_value, -1 * rhs );
  }

  /** @brief  Explicitly return m_value. */
  int32_t value (void) const
  {
    // return m_value;
    return m_value;
  }
  

};

}

#endif