/*
 *  ZThreads, a platform-independant, multithreading and 
 *  synchroniation library
 *
 *  Copyright (C) 2001, 2002 Eric Crahen, See LGPL.TXT for details
 *
 *  This library is free software; you can redistribute it and/or
 *  modify it under the terms of the GNU Lesser General Public
 *  License as published by the Free Software Foundation; either
 *  version 2.1 of the License, or (at your option) any later version.
 *
 *  This library 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
 *  Lesser General Public License for more details.
 *
 *  You should have received a copy of the GNU Lesser General Public
 *  License along with this library; if not, write to the Free Software
 *  Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
 *
 *  SUNY @ Buffalo, hereby disclaims all copyright interest in the
 *  ZThreads library written by Eric Crahen
 */

#include "zthread/AbstractThreadLocal.h"
#include "ThreadImpl.h"
#include "ThreadLocalMap.h"

namespace ZThread {

AbstractThreadLocal::AbstractThreadLocal() {}

AbstractThreadLocal::~AbstractThreadLocal() throw() {} 

void* AbstractThreadLocal::get() const throw() {

  ThreadLocalMap& map = ThreadImpl::current()->getThreadLocalMap();
  void* value = 0;

  // Try to get the value directly from the map, if its not present
  // then initialize that value.
  if(!map.getValue(this, value)) {
    
    value = initialValue();
    void* oldValue;

    map.setValue(this, oldValue, value);

  }

  return value;

}

void* AbstractThreadLocal::set(void* newValue) const throw() {

  ThreadLocalMap& map = ThreadImpl::current()->getThreadLocalMap();
  void* oldValue = 0;
 
  if(!map.setValue(this, oldValue, newValue))
    oldValue = initialValue();
  
  return oldValue;

}

} // namespace ZThread 
