atomiccount.cxx.svn-base

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/*
 * Copyright (c) 2005, Eric Crahen
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is furnished
 * to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
 * WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
 * CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.
 *
 */

#ifndef __ZTATOMICCOUNTIMPL_H__
#define __ZTATOMICCOUNTIMPL_H__

#include <windows.h>
#include <assert.h>

namespace ZThread {


AtomicCount::AtomicCount() {

  _value = reinterpret_cast<void*>(new LONG(0));
  
}

AtomicCount::~AtomicCount() {

  assert(*reinterpret_cast<LPLONG>(_value) == 0);
  delete reinterpret_cast<LPLONG>(_value);

}
  
void AtomicCount::increment() {

  ::InterlockedIncrement(reinterpret_cast<LPLONG>(_value));
  
}
  
bool AtomicCount::decrement() {

  LONG v = ::InterlockedDecrement(reinterpret_cast<LPLONG>(_value));
  return static_cast<unsigned long>(v) == 0;
  
}
 
};

#endif // __ZTATOMICCOUNTIMPL_H__