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#ifndef BOOST_THREAD_PTHREAD_ONCE_ATOMIC_HPP
#define BOOST_THREAD_PTHREAD_ONCE_ATOMIC_HPP
// once.hpp
//
// (C) Copyright 2013 Andrey Semashev
// (C) Copyright 2013 Vicente J. Botet Escriba
//
// 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 <boost/thread/detail/config.hpp>
#include <boost/cstdint.hpp>
#include <boost/thread/detail/move.hpp>
#include <boost/thread/detail/invoke.hpp>
#include <boost/core/no_exceptions_support.hpp>
#include <boost/bind.hpp>
#include <boost/atomic.hpp>
#include <boost/config/abi_prefix.hpp>
namespace boost
{
struct once_flag;
namespace thread_detail
{
#if BOOST_ATOMIC_INT_LOCK_FREE == 2
typedef unsigned int atomic_int_type;
#elif BOOST_ATOMIC_SHORT_LOCK_FREE == 2
typedef unsigned short atomic_int_type;
#elif BOOST_ATOMIC_CHAR_LOCK_FREE == 2
typedef unsigned char atomic_int_type;
#elif BOOST_ATOMIC_LONG_LOCK_FREE == 2
typedef unsigned long atomic_int_type;
#elif defined(BOOST_HAS_LONG_LONG) && BOOST_ATOMIC_LLONG_LOCK_FREE == 2
typedef ulong_long_type atomic_int_type;
#else
// All tested integer types are not atomic, the spinlock pool will be used
typedef unsigned int atomic_int_type;
#endif
typedef boost::atomic<atomic_int_type> atomic_type;
BOOST_THREAD_DECL bool enter_once_region(once_flag& flag) BOOST_NOEXCEPT;
BOOST_THREAD_DECL void commit_once_region(once_flag& flag) BOOST_NOEXCEPT;
BOOST_THREAD_DECL void rollback_once_region(once_flag& flag) BOOST_NOEXCEPT;
inline atomic_type& get_atomic_storage(once_flag& flag) BOOST_NOEXCEPT;
}
#ifdef BOOST_THREAD_PROVIDES_ONCE_CXX11
struct once_flag
{
BOOST_THREAD_NO_COPYABLE(once_flag)
BOOST_CONSTEXPR once_flag() BOOST_NOEXCEPT : storage(0)
{
}
private:
thread_detail::atomic_type storage;
friend BOOST_THREAD_DECL bool thread_detail::enter_once_region(once_flag& flag) BOOST_NOEXCEPT;
friend BOOST_THREAD_DECL void thread_detail::commit_once_region(once_flag& flag) BOOST_NOEXCEPT;
friend BOOST_THREAD_DECL void thread_detail::rollback_once_region(once_flag& flag) BOOST_NOEXCEPT;
friend thread_detail::atomic_type& thread_detail::get_atomic_storage(once_flag& flag) BOOST_NOEXCEPT;
};
#define BOOST_ONCE_INIT boost::once_flag()
namespace thread_detail
{
inline atomic_type& get_atomic_storage(once_flag& flag) BOOST_NOEXCEPT
{
//return reinterpret_cast< atomic_type& >(flag.storage);
return flag.storage;
}
}
#else // BOOST_THREAD_PROVIDES_ONCE_CXX11
struct once_flag
{
// The thread_detail::atomic_int_type storage is marked
// with this attribute in order to let the compiler know that it will alias this member
// and silence compilation warnings.
BOOST_THREAD_ATTRIBUTE_MAY_ALIAS thread_detail::atomic_int_type storage;
};
#define BOOST_ONCE_INIT {0}
namespace thread_detail
{
inline atomic_type& get_atomic_storage(once_flag& flag) BOOST_NOEXCEPT
{
return reinterpret_cast< atomic_type& >(flag.storage);
}
}
#endif // BOOST_THREAD_PROVIDES_ONCE_CXX11
#if defined BOOST_THREAD_PROVIDES_INVOKE
#define BOOST_THREAD_INVOKE_RET_VOID detail::invoke
#define BOOST_THREAD_INVOKE_RET_VOID_CALL
#elif defined BOOST_THREAD_PROVIDES_INVOKE_RET
#define BOOST_THREAD_INVOKE_RET_VOID detail::invoke<void>
#define BOOST_THREAD_INVOKE_RET_VOID_CALL
#else
#define BOOST_THREAD_INVOKE_RET_VOID boost::bind
#define BOOST_THREAD_INVOKE_RET_VOID_CALL ()
#endif
#if !defined(BOOST_NO_CXX11_VARIADIC_TEMPLATES) && !defined(BOOST_NO_CXX11_RVALUE_REFERENCES)
template<typename Function, class ...ArgTypes>
inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(ArgTypes)... args)
{
if (thread_detail::enter_once_region(flag))
{
BOOST_TRY
{
BOOST_THREAD_INVOKE_RET_VOID(
thread_detail::decay_copy(boost::forward<Function>(f)),
thread_detail::decay_copy(boost::forward<ArgTypes>(args))...
) BOOST_THREAD_INVOKE_RET_VOID_CALL;
}
BOOST_CATCH (...)
{
thread_detail::rollback_once_region(flag);
BOOST_RETHROW
}
BOOST_CATCH_END
thread_detail::commit_once_region(flag);
}
}
#else
template<typename Function>
inline void call_once(once_flag& flag, Function f)
{
if (thread_detail::enter_once_region(flag))
{
BOOST_TRY
{
f();
}
BOOST_CATCH (...)
{
thread_detail::rollback_once_region(flag);
BOOST_RETHROW
}
BOOST_CATCH_END
thread_detail::commit_once_region(flag);
}
}
template<typename Function, typename T1>
inline void call_once(once_flag& flag, Function f, T1 p1)
{
if (thread_detail::enter_once_region(flag))
{
BOOST_TRY
{
BOOST_THREAD_INVOKE_RET_VOID(f, p1) BOOST_THREAD_INVOKE_RET_VOID_CALL;
}
BOOST_CATCH (...)
{
thread_detail::rollback_once_region(flag);
BOOST_RETHROW
}
BOOST_CATCH_END
thread_detail::commit_once_region(flag);
}
}
template<typename Function, typename T1, typename T2>
inline void call_once(once_flag& flag, Function f, T1 p1, T2 p2)
{
if (thread_detail::enter_once_region(flag))
{
BOOST_TRY
{
BOOST_THREAD_INVOKE_RET_VOID(f, p1, p2) BOOST_THREAD_INVOKE_RET_VOID_CALL;
}
BOOST_CATCH (...)
{
thread_detail::rollback_once_region(flag);
BOOST_RETHROW
}
BOOST_CATCH_END
thread_detail::commit_once_region(flag);
}
}
template<typename Function, typename T1, typename T2, typename T3>
inline void call_once(once_flag& flag, Function f, T1 p1, T2 p2, T3 p3)
{
if (thread_detail::enter_once_region(flag))
{
BOOST_TRY
{
BOOST_THREAD_INVOKE_RET_VOID(f, p1, p2, p3) BOOST_THREAD_INVOKE_RET_VOID_CALL;
}
BOOST_CATCH (...)
{
thread_detail::rollback_once_region(flag);
BOOST_RETHROW
}
BOOST_CATCH_END
thread_detail::commit_once_region(flag);
}
}
template<typename Function>
inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f)
{
if (thread_detail::enter_once_region(flag))
{
BOOST_TRY
{
f();
}
BOOST_CATCH (...)
{
thread_detail::rollback_once_region(flag);
BOOST_RETHROW
}
BOOST_CATCH_END
thread_detail::commit_once_region(flag);
}
}
template<typename Function, typename T1>
inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(T1) p1)
{
if (thread_detail::enter_once_region(flag))
{
BOOST_TRY
{
BOOST_THREAD_INVOKE_RET_VOID(
thread_detail::decay_copy(boost::forward<Function>(f)),
thread_detail::decay_copy(boost::forward<T1>(p1))
) BOOST_THREAD_INVOKE_RET_VOID_CALL;
}
BOOST_CATCH (...)
{
thread_detail::rollback_once_region(flag);
BOOST_RETHROW
}
BOOST_CATCH_END
thread_detail::commit_once_region(flag);
}
}
template<typename Function, typename T1, typename T2>
inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(T1) p1, BOOST_THREAD_RV_REF(T2) p2)
{
if (thread_detail::enter_once_region(flag))
{
BOOST_TRY
{
BOOST_THREAD_INVOKE_RET_VOID(
thread_detail::decay_copy(boost::forward<Function>(f)),
thread_detail::decay_copy(boost::forward<T1>(p1)),
thread_detail::decay_copy(boost::forward<T1>(p2))
) BOOST_THREAD_INVOKE_RET_VOID_CALL;
}
BOOST_CATCH (...)
{
thread_detail::rollback_once_region(flag);
BOOST_RETHROW
}
BOOST_CATCH_END
thread_detail::commit_once_region(flag);
}
}
template<typename Function, typename T1, typename T2, typename T3>
inline void call_once(once_flag& flag, BOOST_THREAD_RV_REF(Function) f, BOOST_THREAD_RV_REF(T1) p1, BOOST_THREAD_RV_REF(T2) p2, BOOST_THREAD_RV_REF(T3) p3)
{
if (thread_detail::enter_once_region(flag))
{
BOOST_TRY
{
BOOST_THREAD_INVOKE_RET_VOID(
thread_detail::decay_copy(boost::forward<Function>(f)),
thread_detail::decay_copy(boost::forward<T1>(p1)),
thread_detail::decay_copy(boost::forward<T1>(p2)),
thread_detail::decay_copy(boost::forward<T1>(p3))
) BOOST_THREAD_INVOKE_RET_VOID_CALL;
}
BOOST_CATCH (...)
{
thread_detail::rollback_once_region(flag);
BOOST_RETHROW
}
BOOST_CATCH_END
thread_detail::commit_once_region(flag);
}
}
#endif
}
#include <boost/config/abi_suffix.hpp>
#endif
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Swift