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///
/// @file iatomic.h @brief Misc function header file
///
/// Copyright (c) 2014 by Johns. All Rights Reserved.
///
/// Contributor(s):
///
/// License: AGPLv3
///
/// This program is free software: you can redistribute it and/or modify
/// it under the terms of the GNU Affero General Public License as
/// published by the Free Software Foundation, either version 3 of the
/// License.
///
/// This program 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 Affero General Public License for more details.
///
/// $Id$
//////////////////////////////////////////////////////////////////////////////
/// @addtogroup iatomic
/// @{
#define GCC_VERSION (__GNUC__ * 10000 \
+ __GNUC_MINOR__ * 100 \
+ __GNUC_PATCHLEVEL__)
// gcc before 4.7 didn't support atomic builtins,
// use alsa atomic functions.
#if GCC_VERSION < 40700
#include <alsa/iatomic.h>
#else
//////////////////////////////////////////////////////////////////////////////
// Defines
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
// Declares
//////////////////////////////////////////////////////////////////////////////
///
/// atomic type, 24 bit useable,
///
typedef volatile int atomic_t;
//////////////////////////////////////////////////////////////////////////////
// Prototypes
//////////////////////////////////////////////////////////////////////////////
//////////////////////////////////////////////////////////////////////////////
// Inlines
//////////////////////////////////////////////////////////////////////////////
///
/// Set atomic value.
///
#define atomic_set(ptr, val) \
__atomic_store_n(ptr, val, __ATOMIC_SEQ_CST)
///
/// Read atomic value.
///
#define atomic_read(ptr) \
__atomic_load_n(ptr, __ATOMIC_SEQ_CST)
///
/// Increment atomic value.
///
#define atomic_inc(ptr) \
__atomic_add_fetch(ptr, 1, __ATOMIC_SEQ_CST)
///
/// Decrement atomic value.
///
#define atomic_dec(ptr) \
__atomic_sub_fetch(ptr, 1, __ATOMIC_SEQ_CST)
///
/// Add to atomic value.
///
#define atomic_add(val, ptr) \
__atomic_add_fetch(ptr, val, __ATOMIC_SEQ_CST)
///
/// Subtract from atomic value.
///
#define atomic_sub(val, ptr) \
__atomic_sub_fetch(ptr, val, __ATOMIC_SEQ_CST)
#endif
/// @}
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