BAtomicCount.h

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/*******************************************************************************
 *  BAtomicCount.h      BAtomicCount Atomic Counter
 *  T.Barnaby,  BEAM Ltd,   2008-06-17
 *  Copyright (c) 2012 All Right Reserved, Beam Ltd, http://www.beam.ltd.uk
 *******************************************************************************
 *
 * For license see LICENSE.txt at the root of the beamlib source tree.
 */
#ifndef BAtomicCount_H
#define BAtomicCount_H  1
 
#if TARGET_vdc
class BAtomicCount {
public:
            BAtomicCount(long value = 0) : ovalue(value){}
 
    long        getValue() const {
                return __sync_fetch_and_add(&ovalue, 0);
            }
    long        add(long value){
                return __sync_fetch_and_add(&ovalue, value) + value;
            }
    long        operator++(int){
                return __sync_fetch_and_add(&ovalue, 1);
            }   
    long        operator++(){
                return __sync_fetch_and_add(&ovalue, 1) + 1;
            }   
    long        operator--(int){
                return __sync_fetch_and_add(&ovalue, -1);
            }
    long        operator--(){
                return __sync_fetch_and_add(&ovalue, -1) - 1;
            }
            operator long() const {
                return getValue();
            }
private:
    mutable long    ovalue;
};
#else
#if __GNUC__ >= 5 || __GNUC_MINOR__ >= 4
#include <ext/atomicity.h>
#else
#include <bits/atomicity.h>
#endif
 
class BAtomicCount {
public:
            BAtomicCount(long value = 0) : ovalue(value){}
 
    long        getValue() const {
                return __gnu_cxx::__exchange_and_add(&ovalue, 0);
            }
    long        add(long value){
                return __gnu_cxx::__exchange_and_add(&ovalue, value) + value;
            }
    long        operator++(int){
                return __gnu_cxx::__exchange_and_add(&ovalue, 1);
            }   
    long        operator++(){
                return __gnu_cxx::__exchange_and_add(&ovalue, 1) + 1;
            }   
    long        operator--(int){
                return __gnu_cxx::__exchange_and_add(&ovalue, -1);
            }
    long        operator--(){
                return __gnu_cxx::__exchange_and_add(&ovalue, -1) - 1;
            }
            operator long() const {
                return getValue();
            }
private:
    mutable _Atomic_word    ovalue;
};
#endif
 
#endif