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Different values in threads of the same global variable

Question asked by t-man on Sep 8, 2012
Latest reply on Sep 8, 2012 by t-man

Ao I am dealing with the following situation. I want all my threads to do a loop until none of them reaches a certain "if", so I use a global variable that stores 0 and when the if statement is reached that variable becomes 1. 


The problem is that at the end of the loop I do a barrier to synchronize all the threads( in my case I just have 4) and only does that reached the if have the value of the global variable 1, the others have it 0.


How can that be? How can a global variable have different values in different threads?