/**
 * @file
 *
 * Define atomic read-modify-write memory options for Microsoft compiler
 */

/******************************************************************************
 *
 *
 * Copyright (c) 2009-2011, AllSeen Alliance. All rights reserved.
 *
 *    Permission to use, copy, modify, and/or distribute this software for any
 *    purpose with or without fee is hereby granted, provided that the above
 *    copyright notice and this permission notice appear in all copies.
 *
 *    THE SOFTWARE IS PROVIDED "AS IS" AND THE AUTHOR DISCLAIMS ALL WARRANTIES
 *    WITH REGARD TO THIS SOFTWARE INCLUDING ALL IMPLIED WARRANTIES OF
 *    MERCHANTABILITY AND FITNESS. IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR
 *    ANY SPECIAL, DIRECT, INDIRECT, OR CONSEQUENTIAL DAMAGES OR ANY DAMAGES
 *    WHATSOEVER RESULTING FROM LOSS OF USE, DATA OR PROFITS, WHETHER IN AN
 *    ACTION OF CONTRACT, NEGLIGENCE OR OTHER TORTIOUS ACTION, ARISING OUT OF
 *    OR IN CONNECTION WITH THE USE OR PERFORMANCE OF THIS SOFTWARE.
 ******************************************************************************/
#ifndef _TOOLCHAIN_QCC_ATOMIC_H
#define _TOOLCHAIN_QCC_ATOMIC_H

#include <windows.h>

namespace qcc {

/**
 * Increment an int32_t and return it's new value atomically.
 *
 * @param mem   Pointer to int32_t to be incremented.
 * @return  New value (after increment) of *mem
 */
inline int32_t IncrementAndFetch(volatile int32_t* mem) {
    return InterlockedIncrement(reinterpret_cast<volatile long*>(mem));
}

/**
 * Decrement an int32_t and return it's new value atomically.
 *
 * @param mem   Pointer to int32_t to be decremented.
 * @return  New value (after decrement) of *mem
 */
inline int32_t DecrementAndFetch(volatile int32_t* mem) {
    return InterlockedDecrement(reinterpret_cast<volatile long*>(mem));
}

}

#endif