vdr-plugin-softhdcuvid/iatomic.h

///
/// @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: 59e1684aaa6678ecdebb6ce0df6ce5b5f461dd6e $
//////////////////////////////////////////////////////////////////////////////

/// @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

/// @}