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Re: pthread_barrier type and functions


From: Bruno Haible
Subject: Re: pthread_barrier type and functions
Date: Sun, 08 Mar 2015 12:51:25 +0100
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Mohammad Akhlaghi wrote:
> I have made extensive use of the pthread_barrier_* types and functions 
> for the parallel processing parts of gnuastro. But I found out Gnulib 
> doesn't include them. I wanted to see if it would be possible for you to 
> include these in the Gnulib version of pthread. Using a pthread_barrier 
> is simpler than using a mutex and condition variable together when the 
> jobs are completely independent.

Which one of these two implementation approaches would be better:

a) using the same design as glibc,
   
https://sourceware.org/git/?p=glibc.git;a=blob;f=nptl/DESIGN-barrier.txt;hb=HEAD
   possibly with an additional lock for the atomic increment?

b) using two semaphores, as in
   
http://stackoverflow.com/questions/6331301/implementing-an-n-process-barrier-using-semaphores
   (possibly replacing the second semaphore with a pthread_cond_t ?)

[I'm not going to implement it. Just trying to give food for thought.]

Bruno




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