/usr/include/boost/atomic/detail
Edit: /usr/include/boost/atomic/detail/core_ops_linux_arm.hpp (6364B)
/*
* 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)
*
* Copyright (c) 2009, 2011 Helge Bahmann
* Copyright (c) 2009 Phil Endecott
* Copyright (c) 2013 Tim Blechmann
* Linux-specific code by Phil Endecott
* Copyright (c) 2014 Andrey Semashev
*/
/*!
* \file atomic/detail/core_ops_linux_arm.hpp
*
* This header contains implementation of the \c core_operations template.
*/
#ifndef BOOST_ATOMIC_DETAIL_CORE_OPS_LINUX_ARM_HPP_INCLUDED_
#define BOOST_ATOMIC_DETAIL_CORE_OPS_LINUX_ARM_HPP_INCLUDED_
#include
#include
#include
#include
#include
#include
#include
#include
#include
#include
#ifdef BOOST_HAS_PRAGMA_ONCE
#pragma once
#endif
namespace boost {
namespace atomics {
namespace detail {
// Different ARM processors have different atomic instructions. In particular,
// architecture versions before v6 (which are still in widespread use, e.g. the
// Intel/Marvell XScale chips like the one in the NSLU2) have only atomic swap.
// On Linux the kernel provides some support that lets us abstract away from
// these differences: it provides emulated CAS and barrier functions at special
// addresses that are guaranteed not to be interrupted by the kernel. Using
// this facility is slightly slower than inline assembler would be, but much
// faster than a system call.
//
// https://lwn.net/Articles/314561/
//
// While this emulated CAS is "strong" in the sense that it does not fail
// "spuriously" (i.e.: it never fails to perform the exchange when the value
// found equals the value expected), it does not return the found value on
// failure. To satisfy the atomic API, compare_exchange_{weak|strong} must
// return the found value on failure, and we have to manually load this value
// after the emulated CAS reports failure. This in turn introduces a race
// between the CAS failing (due to the "wrong" value being found) and subsequently
// loading (which might turn up the "right" value). From an application's
// point of view this looks like "spurious failure", and therefore the
// emulated CAS is only good enough to provide compare_exchange_weak
// semantics.
struct linux_arm_cas_base
{
static BOOST_CONSTEXPR_OR_CONST bool full_cas_based = true;
static BOOST_CONSTEXPR_OR_CONST bool is_always_lock_free = true;
static BOOST_FORCEINLINE void fence_before_store(memory_order order) BOOST_NOEXCEPT
{
if ((static_cast< unsigned int >(order) & static_cast< unsigned int >(memory_order_release)) != 0u)
fence_operations::hardware_full_fence();
}
static BOOST_FORCEINLINE void fence_after_store(memory_order order) BOOST_NOEXCEPT
{
if (order == memory_order_seq_cst)
fence_operations::hardware_full_fence();
}
static BOOST_FORCEINLINE void fence_after_load(memory_order order) BOOST_NOEXCEPT
{
if ((static_cast< unsigned int >(order) & (static_cast< unsigned int >(memory_order_consume) | static_cast< unsigned int >(memory_order_acquire))) != 0u)
fence_operations::hardware_full_fence();
}
};
template< bool Signed, bool Interprocess >
struct linux_arm_cas :
public linux_arm_cas_base
{
typedef typename storage_traits< 4u >::type storage_type;
static BOOST_CONSTEXPR_OR_CONST std::size_t storage_size = 4u;
static BOOST_CONSTEXPR_OR_CONST std::size_t storage_alignment = 4u;
static BOOST_CONSTEXPR_OR_CONST bool is_signed = Signed;
static BOOST_CONSTEXPR_OR_CONST bool is_interprocess = Interprocess;
static BOOST_FORCEINLINE void store(storage_type volatile& storage, storage_type v, memory_order order) BOOST_NOEXCEPT
{
fence_before_store(order);
storage = v;
fence_after_store(order);
}
static BOOST_FORCEINLINE storage_type load(storage_type const volatile& storage, memory_order order) BOOST_NOEXCEPT
{
storage_type v = storage;
fence_after_load(order);
return v;
}
static BOOST_FORCEINLINE bool compare_exchange_strong(
storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order success_order, memory_order failure_order) BOOST_NOEXCEPT
{
while (true)
{
storage_type tmp = expected;
if (compare_exchange_weak(storage, tmp, desired, success_order, failure_order))
return true;
if (tmp != expected)
{
expected = tmp;
return false;
}
}
}
static BOOST_FORCEINLINE bool compare_exchange_weak(
storage_type volatile& storage, storage_type& expected, storage_type desired, memory_order, memory_order) BOOST_NOEXCEPT
{
typedef storage_type (*kernel_cmpxchg32_t)(storage_type oldval, storage_type newval, volatile storage_type* ptr);
if (((kernel_cmpxchg32_t)0xffff0fc0)(expected, desired, &storage) == 0)
{
return true;
}
else
{
expected = storage;
return false;
}
}
};
template< bool Signed, bool Interprocess >
struct core_operations< 1u, Signed, Interprocess > :
public extending_cas_based_arithmetic< core_operations_cas_based< cas_based_exchange< linux_arm_cas< Signed, Interprocess > > >, 1u, Signed >
{
};
template< bool Signed, bool Interprocess >
struct core_operations< 2u, Signed, Interprocess > :
public extending_cas_based_arithmetic< core_operations_cas_based< cas_based_exchange< linux_arm_cas< Signed, Interprocess > > >, 2u, Signed >
{
};
template< bool Signed, bool Interprocess >
struct core_operations< 4u, Signed, Interprocess > :
public core_operations_cas_based< cas_based_exchange< linux_arm_cas< Signed, Interprocess > > >
{
};
} // namespace detail
} // namespace atomics
} // namespace boost
#include
#endif // BOOST_ATOMIC_DETAIL_CORE_OPS_LINUX_ARM_HPP_INCLUDED_