[Bug libgomp/42828] New: OpenMP executes unreliably when used in pthread.

["jos dot de_laender at telenet dot be" <gcc-bugzilla at gcc dot gnu dot org>]

Background :

-OpenMP started from a pthread doesn't work for regular mingw. This has been
reported in http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42616 and is confirmed.

For that reason I switched to http://sourceforge.net/projects/mingw-w64/ which
has the advantage of working TLS.

My test case runs much better and further now. But it crashes 1 out of 5 times
on my machine while cleaning up threads (gomp_free_thread). 

Some elementary analysis points very much in some weakness in the gomp_barrier
for mingw. I'm tending to conclude that because :

- adding some short Sleep() before the end of free_gomp_pool_helper makes it
rocksolid.
- It is rocksolid as well on Linux. I noticed that the barrier is implemented
differentl there.


-- 
           Summary: OpenMP executes unreliably when used in pthread.
           Product: gcc
           Version: 4.4.2
            Status: UNCONFIRMED
          Severity: blocker
          Priority: P3
         Component: libgomp
        AssignedTo: unassigned at gcc dot gnu dot org
        ReportedBy: jos dot de_laender at telenet dot be
  GCC host triplet: i686-pc-mingw32
GCC target triplet: mingw64 - see description.


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=42828