[Omp] Can I Reverse the order of the threads in the for loop?

[Alchemist]

Hi ,

Can I reverse the order (or change generally the order) in which the threads are running in the FOR loop ? For example instead of having the threads running at the normal order 0,1,2...n-1,   to run at  n-1, n-2, ...,1, 0 "reverse" order.

The reason why I am asking that question is that I want to build a program that dynamically changes the chunksize depending at the amount of objects on screen (more objects -> more calculations). 
If I want for example to give the "whole for loop" to one thread I will have to set the chunk_size equal to the amount of iterations in the for loop, but the problem is that the for loop will be assigned to the first running thread, if I want to assign it to the last one, what should I do?
    

  

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Best regards,
 Emmanouil Hatjissavvas                          mailto:my at daedalus.plus.com