Re: Branch bill-mt for parallel pari updated again

[Bill Allombert <Bill.Allombert@math.u-bordeaux1.fr>]

Dear PARI developers,

I have updated the GIT branch bill-mt for parallel pari again.
This branch support
- POSIX threads: do
- MPI (for clusters)

The documentation is available at
<http://pari.math.u-bordeaux.fr/~bill/parallel.pdf>
and hasve been improved.

The following parallel GP functions are available:
parapply, pareval, parsum, parvector
and two new experimental parallel function:
parfor and parforprime

parfirst have been removed, it can be written in GP as

parfirst(pred,V)=
{
  parfor(i=1,#V,
    pred(V[i]),
    cond,
    if(cond,return([i,cond]));
  [0,0]
}

parforprime is similar to parfor but iterate over primes.

This new version fix various bugs in parfor.
In particular now the second expression of parfor (expr2) can use
global variables since it is not run in parallel.

Cheers,
Bill.