[Bug libgomp/40494] New: omp for loop with guided schedule fails to terminate in certain cases

[per at bitempire dot com]

The following loop, which seems valid according to the OpenMP specification
v2.5 and 3.0 fails to terminate:

int x;
#pragma omp parallel for schedule(guided)
for(x = 3; x < 478; x += 2) {
  ...
}

I've tested with two and eight threads and different chunksizes, with the same
non-termination result. Changing the upper bound to 477, however, makes the
loop terminate, which leads me to belive this is an issue in the GNU OpenMP
runtime library.

I have confirmed that the problems exists in 4.2, 4.3 and 4.5 (trunk,
19-06-09). To me,  bug 35625 seems somewhat similar but was supposedly fixed in
4.3.

/Per


-- 
   Summary: omp for loop with guided schedule fails to terminate in
certain cases
   Product: gcc
   Version: 4.2.1
Status: UNCONFIRMED
  Severity: normal
  Priority: P3
 Component: libgomp
AssignedTo: unassigned at gcc dot gnu dot org
ReportedBy: per at bitempire dot com
 GCC build triplet: i686-pc-linux
  GCC host triplet: i686-pc-linux
GCC target triplet: i686-pc-linux


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40494

[Bug libgomp/40494] omp for loop with guided schedule fails to terminate in certain cases

[per at bitempire dot com]

--- Comment #2 from per at bitempire dot com  2009-07-28 11:23 ---
Sorry, you're right - it works fine with gcc 4.3 and later. I must have
accidentally linked to libgomp 4.2 which is a part of llvm-gcc.

I apologize for the inconvenience.


-- 

per at bitempire dot com changed:

   What|Removed |Added

 Status|UNCONFIRMED |RESOLVED
 Resolution||INVALID


http://gcc.gnu.org/bugzilla/show_bug.cgi?id=40494