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