[Mingw-w64-public] winpthreads issue

[Ruben V. B. <van...@gm...>]

Hi,

In an effort to solve the issue(s) with winpthreads, I did the following:

Using this source:
#include <omp.h>
#include <stdio.h>
#include <stdlib.h>

int main (int argc, char *argv[])
{
int nthreads, tid;
/* Fork a team of threads giving them their own copies of variables */
#pragma omp parallel private(nthreads, tid)
  {
  /* Obtain thread number */
  tid = omp_get_thread_num();
  printf("Hello World from thread = %d\n", tid);
  /* Only master thread does this */
  if (tid == 0)
    {
    nthreads = omp_get_num_threads();
    printf("Number of threads = %d\n", nthreads);
    }
  }  /* All threads join master thread and disband */
}

I tested execution after simple compilation:
gcc -fopenmp omp_hello.c -o test.exe
test.exe

With sezero's 4.5 build
(http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Personal%20Builds/sezero_4.5_20101002/)
and my latest Personal Build
(http://sourceforge.net/projects/mingw-w64/files/Toolchains%20targetting%20Win64/Personal%20Builds/rubenvb/4.6.2-1/)
The difference between the two being pthreads-win32 vs winpthreads.
The executable produced with pthreads-win32 (sezero) works and outputs
what's expected. The winpthreads version hangs at 100% CPU (two cores
full load) for more than 5 minutes and no output.

To make sure it's not my personal build's problem, I checked against
my 4.6.1-2 release, the latest with pthreads-win32. This works as
sezero's build, and outputs immediately. It is not a GCC 4.6 issue, it
is a winpthreads vs pthreads-win32 issue.

I also ran the pthreads-win32 testsuite, and it shows errors when ran
against the winpthreads library.

Ruben