Subj : Re: What does Memory Barriers mean ??
To   : comp.programming.threads
From : SenderX
Date : Mon Jan 10 2005 11:39 pm

> About the only thing a compiler can optimize across a call are local stack
> variables that has never had their addresses taken.

I wonder if this could happen...

static int global = 0;



1. int *local = &global;
2. pthread_mutex_lock( ... );
3. *local = 5;
4. pthread_mutex_unlock( ... );



Since local has never had its address taken, could step 3 possibly be moved 
out of the critical section?

.