historical/toontown-classic.git/panda/include/atomicAdjustGccImpl.h
2024-01-16 11:20:27 -06:00

58 lines
2 KiB
C++

/**
* PANDA 3D SOFTWARE
* Copyright (c) Carnegie Mellon University. All rights reserved.
*
* All use of this software is subject to the terms of the revised BSD
* license. You should have received a copy of this license along
* with this source code in a file named "LICENSE."
*
* @file atomicAdjustGccImpl.h
* @author rdb
* @date 2014-07-04
*/
#ifndef ATOMICADJUSTGCCIMPL_H
#define ATOMICADJUSTGCCIMPL_H
#include "dtoolbase.h"
#include "selectThreadImpl.h"
#if (defined(__GNUC__) && (__GNUC__ > 4 || (__GNUC__ == 4 && __GNUC_MINOR__ >= 7))) || (defined(__clang__) && (__clang_major__ >= 3))
/**
* Uses GCC built-ins to implement atomic adjustments.
*/
class EXPCL_DTOOL_DTOOLBASE AtomicAdjustGccImpl {
public:
#if __GCC_ATOMIC_LONG_LOCK_FREE >= __GCC_ATOMIC_INT_LOCK_FREE
// If the long can be more lock-free than int, use it instead.
typedef __attribute__ ((aligned (__SIZEOF_LONG__))) long Integer;
#else
typedef __attribute__ ((aligned (__SIZEOF_INT__))) int Integer;
#endif
typedef void *UnalignedPointer;
typedef __attribute__ ((aligned (__SIZEOF_POINTER__))) UnalignedPointer Pointer;
INLINE static void inc(TVOLATILE Integer &var);
INLINE static bool dec(TVOLATILE Integer &var);
INLINE static Integer add(TVOLATILE Integer &var, Integer delta);
INLINE static Integer set(TVOLATILE Integer &var, Integer new_value);
INLINE static Integer get(const TVOLATILE Integer &var);
INLINE static Pointer set_ptr(TVOLATILE Pointer &var, Pointer new_value);
INLINE static Pointer get_ptr(const TVOLATILE Pointer &var);
INLINE static Integer compare_and_exchange(TVOLATILE Integer &mem,
Integer old_value,
Integer new_value);
INLINE static Pointer compare_and_exchange_ptr(TVOLATILE Pointer &mem,
Pointer old_value,
Pointer new_value);
};
#include "atomicAdjustGccImpl.I"
#endif // HAVE_POSIX_THREADS
#endif