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/* -*- mode: c++; c-basic-offset: 2; indent-tabs-mode: nil; -*-
* vim:expandtab:shiftwidth=2:tabstop=2:smarttab:
*
* Copyright (C) 2009 Sun Microsystems
* Copyright 2005-2008 Intel Corporation. All Rights Reserved.
*
* This program is free software; you can redistribute it and/or modify
* it under the terms of the GNU General Public License as published by
* the Free Software Foundation; version 2 of the License.
*
* This program is distributed in the hope that it will be useful,
* but WITHOUT ANY WARRANTY; without even the implied warranty of
* MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
* GNU General Public License for more details.
*
* You should have received a copy of the GNU General Public License
* along with this program; if not, write to the Free Software
* Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA
*/
#ifndef DRIZZLED_ATOMICS_H
#define DRIZZLED_ATOMICS_H
# if defined(__SUNPRO_CC)
# include <drizzled/atomic/sun_studio.h>
# endif
# if !defined(__ICC) && (defined(HAVE_GCC_ATOMIC_BUILTINS) || defined(__SUNPRO_CC))
# include <drizzled/atomic/gcc_traits.h>
# define ATOMIC_TRAITS internal::gcc_traits
# else /* use pthread impl */
# define ATOMIC_TRAITS internal::pthread_traits
# endif
# if (SIZEOF_SIZE_T >= SIZEOF_LONG_LONG) || (!defined(HAVE_GCC_ATOMIC_BUILTINS) || !defined(__SUNPRO_CC))
# include <pthread.h>
# include <drizzled/atomic/pthread_traits.h>
# endif
namespace drizzled {
namespace internal {
template<typename I> // Primary template
struct atomic_base {
volatile I my_value;
};
template<typename I, typename D, typename T >
class atomic_impl: private atomic_base<I>
{
T traits;
public:
typedef I value_type;
value_type fetch_and_add( D addend )
{
return traits.fetch_and_add(&this->my_value, addend);
}
value_type fetch_and_increment()
{
return traits.fetch_and_increment(&this->my_value);
}
value_type fetch_and_decrement()
{
return traits.fetch_and_decrement(&this->my_value);
}
value_type fetch_and_store( value_type value )
{
return traits.fetch_and_store(&this->my_value, value);
}
value_type compare_and_swap( value_type value, value_type comparand )
{
return traits.compare_and_swap(&this->my_value, value, comparand);
}
operator value_type() const volatile
{
return traits.fetch(&this->my_value);
}
value_type& _internal_reference() const
{
return this->my_value;
}
protected:
value_type store_with_release( value_type rhs )
{
return traits.store_with_release(&this->my_value, rhs);
}
public:
value_type operator+=( D addend )
{
return fetch_and_add(addend)+addend;
}
value_type operator-=( D addend )
{
// Additive inverse of addend computed using binary minus,
// instead of unary minus, for sake of avoiding compiler warnings.
return operator+=(D(0)-addend);
}
value_type operator++() {
return fetch_and_add(1)+1;
}
value_type operator--() {
return fetch_and_add(D(-1))-1;
}
value_type operator++(int) {
return fetch_and_add(1);
}
value_type operator--(int) {
return fetch_and_add(D(-1));
}
};
} /* namespace internal */
//! Primary template for atomic.
/** See the Reference for details.
@ingroup synchronization */
template<typename T>
struct atomic {
};
#define __DRIZZLE_DECL_ATOMIC(T) \
template<> struct atomic<T> \
: internal::atomic_impl<T,T,ATOMIC_TRAITS<T,T> > { \
atomic<T>() : internal::atomic_impl<T,T,ATOMIC_TRAITS<T,T> >() {} \
T operator=( T rhs ) { return store_with_release(rhs); } \
};
__DRIZZLE_DECL_ATOMIC(long)
__DRIZZLE_DECL_ATOMIC(unsigned long)
__DRIZZLE_DECL_ATOMIC(unsigned int)
__DRIZZLE_DECL_ATOMIC(int)
__DRIZZLE_DECL_ATOMIC(unsigned short)
__DRIZZLE_DECL_ATOMIC(short)
__DRIZZLE_DECL_ATOMIC(char)
__DRIZZLE_DECL_ATOMIC(signed char)
__DRIZZLE_DECL_ATOMIC(unsigned char)
__DRIZZLE_DECL_ATOMIC(bool)
/* 32-bit platforms don't have a GCC atomic operation for 64-bit types,
* so we'll use pthread locks to handler 64-bit types on that platforms
*/
# if SIZEOF_SIZE_T >= SIZEOF_LONG_LONG
__DRIZZLE_DECL_ATOMIC(long long)
__DRIZZLE_DECL_ATOMIC(unsigned long long)
# else
# define __DRIZZLE_DECL_ATOMIC64(T) \
template<> struct atomic<T> \
: internal::atomic_impl<T,T,internal::pthread_traits<T,T> > { \
atomic<T>() \
: internal::atomic_impl<T,T,internal::pthread_traits<T,T> >() {} \
T operator=( T rhs ) { return store_with_release(rhs); } \
};
__DRIZZLE_DECL_ATOMIC64(long long)
__DRIZZLE_DECL_ATOMIC64(unsigned long long)
# endif
}
#endif /* DRIZZLED_ATOMIC_H */
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