Simple question: reading / writing a variable in multithreading

Hi guys. I've a too simple question.

I have an int variable which is accesed by two threads. One simply increases it at certain times, the other simply reads it's value.

Code:

---

// thread 1
m_MyVar++;

//thread 2
if(m_MyVar < MyOtherVar)
    ...
else
    ...

---

Should I implement a CCriticalSection or it's unnecessary??? I'm not sure what can happen when reading a variable whose value is being incremented, or perhaps this is an atomic affair?

Thanks in advance.

Correct.

Kuphryn

using this function InterLockedExchangeadd (variable, interval)
For example :

InterLockedExchangeadd (im_Counter ,1 );

Can't imagine how useful that's going to be!

Much thanks guys, you're great!