深入解析 Hazard Pointer (中)

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#include<iostream>
#include<thread>
using namespace std;
class SmartPointer
{
public:
  SmartPointer(int *p)
  {
    pointee_ = p;
    ref_counts_ = 0;
  }
  int *pointee_;
  int ref_counts_;
};
SmartPointer sp(new int(1));
void Reader()
{
  ++sp.ref_counts_;
  cout<<*(sp.pointee_)<<endl;
  --sp.ref_counts_;
}
void Writer()
{
  if (sp.ref_counts_ == 0)
    delete sp.pointee_;
}
int main()
{
  thread t1(Reader);
  thread t2(Reader);
  thread t3(Reader);
  thread t4(Writer);
  t1.join();
  t2.join();
  t3.join();
  t4.join();
  return 0;
}