Singleton pattern - end in recursion

[probine]

The mutex idea doesn't work either.

In class Client.cpp

QMutex mutex;
mutex.lock();
loginGui = LoginGui::loginGuiInstance();
mutex.unlock();

QMutex mutex;
mutex.lock();
loginGui = LoginGui::loginGuiInstance();
mutex.unlock();

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In LoginGui.cpp

QMutex mutex;
     mutex.lock();
     client = Client::clientInstance();
     mutex.unlock();

QMutex mutex;
     mutex.lock();
     client = Client::clientInstance();
     mutex.unlock();

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[wysota]

Try this:

class A {
  A();
  B *b;
public:
  static A *instance();
}
 
class B {
  B(A*);
  A *a;
public:
  static B *instance(A *v=0);
}
 
A::A(){
  b=0;
}
 
B::B(A *v){
  a = v;
}
 
A* A::instance(){
  static A *_inst=0;
  if(!_inst){
    _inst = new A();
    _inst->b = B::instance(_inst);
  }
  return _inst;
}
 
B* B::instance(A *v){
  static B *_inst=0;
  if(_inst){
    _inst = new B(v);
  }
  return _inst;
}

class A {
  A();
  B *b;
public:
  static A *instance();
}

class B {
  B(A*);
  A *a;
public:
  static B *instance(A *v=0);
}

A::A(){
  b=0;
}

B::B(A *v){
  a = v;
}

A* A::instance(){
  static A *_inst=0;
  if(!_inst){
    _inst = new A();
    _inst->b = B::instance(_inst);
  }
  return _inst;
}

B* B::instance(A *v){
  static B *_inst=0;
  if(_inst){
    _inst = new B(v);
  }
  return _inst;
}

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