Looking for command for synchronization of threads

[Sparsh Mittal]

Background:
I am implementing an iterative algorithm in parallel manner. The 
algorithm iteratively updates a matrix (2D grid) of data. So, I 
will "divide" the grid to different threads, which will work on 
it for single iteration. After each iteration, all threads should 
wait since next iteration depends on previous iteration.

My issue:
To achieve synchronization,  I am looking for an equivalent of 
sync in Cilk or cudaEventSynchronize in CUDA. I saw 
"synchronized", but was not sure, if that is the answer. Please 
help me. I will put that command at end of "for" loop and it will 
be executed once per iteration.