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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_ATOMIC_PTHREAD_TRAITS_H
#define DRIZZLED_ATOMIC_PTHREAD_TRAITS_H
namespace drizzled {
namespace internal {
class mutex_wrapper
{
private:
pthread_mutex_t the_mutex;
bool locked;
public:
mutex_wrapper(void)
: the_mutex(),
locked(false)
{
(void) pthread_mutex_init(&the_mutex, NULL);
}
~mutex_wrapper(void)
{
if (locked)
unlock();
pthread_mutex_destroy(&the_mutex);
}
void lock(void)
{
pthread_mutex_lock(&the_mutex);
locked=true;
}
void unlock(void)
{
pthread_mutex_unlock(&the_mutex);
locked=false;
}
};
template<typename T, typename D>
class pthread_traits
{
private:
mutex_wrapper my_lock;
public:
typedef T value_type;
pthread_traits() {}
inline value_type add_and_fetch(volatile value_type *value, D addend )
{
my_lock.lock();
*value += addend;
value_type ret= *value;
my_lock.unlock();
return ret;
}
inline value_type fetch_and_add(volatile value_type *value, D addend )
{
my_lock.lock();
value_type ret= *value;
*value += addend;
my_lock.unlock();
return ret;
}
inline value_type fetch_and_increment(volatile value_type *value)
{
my_lock.lock();
value_type ret= *value;
(*value)++;
my_lock.unlock();
return ret;
}
inline value_type fetch_and_decrement(volatile value_type *value)
{
my_lock.lock();
value_type ret= *value;
(*value)--;
my_lock.unlock();
return ret;
}
inline value_type fetch_and_store(volatile value_type *value,
value_type new_value )
{
my_lock.lock();
value_type ret= *value;
*value= new_value;
my_lock.unlock();
return ret;
}
inline bool compare_and_swap(volatile value_type *value,
value_type new_value,
value_type comparand )
{
my_lock.lock();
bool ret= (*value == comparand);
if (ret)
*value= new_value;
my_lock.unlock();
return ret;
}
inline value_type fetch(const volatile value_type *value) const volatile
{
const_cast<pthread_traits *>(this)->my_lock.lock();
value_type ret= *value;
const_cast<pthread_traits *>(this)->my_lock.unlock();
return ret;
}
inline value_type store_with_release(volatile value_type *value,
value_type new_value)
{
my_lock.lock();
*value= new_value;
value_type ret= *value;
my_lock.unlock();
return ret;
}
}; /* pthread_traits */
} /* namespace internal */
} /* namespace drizzled */
#endif /* DRIZZLED_ATOMIC_PTHREAD_TRAITS_H */
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