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generic-cas.hpp
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generic-cas.hpp
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#ifndef BOOST_DETAIL_ATOMIC_GENERIC_CAS_HPP
#define BOOST_DETAIL_ATOMIC_GENERIC_CAS_HPP
// Copyright (c) 2009 Helge Bahmann
//
// Distributed under the Boost Software License, Version 1.0.
// See accompanying file LICENSE_1_0.txt or copy at
// http://www.boost.org/LICENSE_1_0.txt)
#include <stdint.h>
#include <boost/memory_order.hpp>
#include <boost/atomic/detail/base.hpp>
#include <boost/atomic/detail/builder.hpp>
/* fallback implementation for various compilation targets;
this is *not* efficient, particularly because all operations
are fully fenced (full memory barriers before and after
each operation) */
#if defined(__GNUC__)
namespace boost { namespace detail { namespace atomic {
static inline int32_t
fenced_compare_exchange_strong_32(volatile int32_t *ptr, int32_t expected, int32_t desired)
{
return __sync_val_compare_and_swap_4(ptr, expected, desired);
}
#define BOOST_ATOMIC_HAVE_CAS32 1
#if defined(__amd64__) || defined(__i686__)
static inline int64_t
fenced_compare_exchange_strong_64(int64_t *ptr, int64_t expected, int64_t desired)
{
return __sync_val_compare_and_swap_8(ptr, expected, desired);
}
#define BOOST_ATOMIC_HAVE_CAS64 1
#endif
}}}
#elif defined(__ICL) || defined(_MSC_VER)
#if defined(_MSC_VER)
#include <Windows.h>
#include <intrin.h>
#endif
namespace boost { namespace detail { namespace atomic {
static inline int32_t
fenced_compare_exchange_strong(int32_t *ptr, int32_t expected, int32_t desired)
{
return _InterlockedCompareExchange(reinterpret_cast<volatile long*>(ptr), desired, expected);
}
#define BOOST_ATOMIC_HAVE_CAS32 1
#if defined(_WIN64)
static inline int64_t
fenced_compare_exchange_strong(int64_t *ptr, int64_t expected, int64_t desired)
{
return _InterlockedCompareExchange64(ptr, desired, expected);
}
#define BOOST_ATOMIC_HAVE_CAS64 1
#endif
}}}
#elif (defined(__ICC) || defined(__ECC))
namespace boost { namespace detail { namespace atomic {
static inline int32_t
fenced_compare_exchange_strong_32(int32_t *ptr, int32_t expected, int32_t desired)
{
return _InterlockedCompareExchange((void*)ptr, desired, expected);
}
#define BOOST_ATOMIC_HAVE_CAS32 1
#if defined(__x86_64)
static inline int64_t
fenced_compare_exchange_strong(int64_t *ptr, int64_t expected, int64_t desired)
{
return cas64<int>(ptr, expected, desired);
}
#define BOOST_ATOMIC_HAVE_CAS64 1
#elif defined(__ECC) //IA-64 version
static inline int64_t
fenced_compare_exchange_strong(int64_t *ptr, int64_t expected, int64_t desired)
{
return _InterlockedCompareExchange64((void*)ptr, desired, expected);
}
#define BOOST_ATOMIC_HAVE_CAS64 1
#endif
}}}
#elif (defined(__SUNPRO_CC) && defined(__sparc))
#include <sys/atomic.h>
namespace boost { namespace detail { namespace atomic {
static inline int32_t
fenced_compare_exchange_strong_32(int32_t *ptr, int32_t expected, int32_t desired)
{
return atomic_cas_32((volatile unsigned int*)ptr, expected, desired);
}
#define BOOST_ATOMIC_HAVE_CAS32 1
/* FIXME: check for 64 bit mode */
static inline int64_t
fenced_compare_exchange_strong_64(int64_t *ptr, int64_t expected, int64_t desired)
{
return atomic_cas_64((volatile unsigned long long*)ptr, expected, desired);
}
#define BOOST_ATOMIC_HAVE_CAS64 1
}}}
#endif
namespace boost { namespace detail { namespace atomic {
#ifdef BOOST_ATOMIC_HAVE_CAS32
template<typename T>
class atomic_generic_cas32 {
private:
typedef atomic_generic_cas32 this_type;
public:
explicit atomic_generic_cas32(T v) : i((int32_t)v) {}
atomic_generic_cas32() {}
T load(memory_order order=memory_order_seq_cst) const volatile
{
T expected=(T)i;
do { } while(!const_cast<this_type *>(this)->compare_exchange_weak(expected, expected, order, memory_order_relaxed));
return expected;
}
void store(T v, memory_order order=memory_order_seq_cst) volatile
{
exchange(v);
}
bool compare_exchange_strong(
T &expected,
T desired,
memory_order success_order,
memory_order failure_order) volatile
{
T found;
found=(T)fenced_compare_exchange_strong_32(&i, (int32_t)expected, (int32_t)desired);
bool success=(found==expected);
expected=found;
return success;
}
bool compare_exchange_weak(
T &expected,
T desired,
memory_order success_order,
memory_order failure_order) volatile
{
return compare_exchange_strong(expected, desired, success_order, failure_order);
}
T exchange(T r, memory_order order=memory_order_seq_cst) volatile
{
T expected=(T)i;
do { } while(!compare_exchange_weak(expected, r, order, memory_order_relaxed));
return expected;
}
bool is_lock_free(void) const volatile {return true;}
typedef T integral_type;
private:
mutable int32_t i;
};
template<typename T>
class platform_atomic_integral<T, 4> : public build_atomic_from_exchange<atomic_generic_cas32<T> > {
public:
typedef build_atomic_from_exchange<atomic_generic_cas32<T> > super;
explicit platform_atomic_integral(T v) : super(v) {}
platform_atomic_integral(void) {}
};
template<typename T>
class platform_atomic_integral<T, 1>: public build_atomic_from_larger_type<atomic_generic_cas32<int32_t>, T> {
public:
typedef build_atomic_from_larger_type<atomic_generic_cas32<int32_t>, T> super;
explicit platform_atomic_integral(T v) : super(v) {}
platform_atomic_integral(void) {}
};
template<typename T>
class platform_atomic_integral<T, 2>: public build_atomic_from_larger_type<atomic_generic_cas32<int32_t>, T> {
public:
typedef build_atomic_from_larger_type<atomic_generic_cas32<int32_t>, T> super;
explicit platform_atomic_integral(T v) : super(v) {}
platform_atomic_integral(void) {}
};
#endif
} } }
#endif