osc/pt2pt fails with multiple threads

[jjhursey]

Testing with the osc/pt2pt component revealed multiple hangs and wrong answers when running with two threads. Each thread is working with it's own communicator copy of MPI_COMM_WORLD and their own private windows.

The test is here:

• https://github.com/open-mpi/ompi-tests/pull/25
• https://gist.github.com/markalle/56f739c3c907e53960d22d5de2fe4bc9

% mpicc -o x mt_1sided.c mt_1sided_td1.c mt_1sided_td2.c
% mpirun -host hostA,hostB -mca osc pt2pt -mca pml ob1 -mca btl openib,self,vader ./x

PR #2630 will need to be reverted when a resolution to this issue is committed on v2.0.x branch.

[hjelmn]

I can't get this to hang with osc/rdma. @markalle Was the 1sided.c test hanging with osc/rdma or just osc/pt2pt?

[hjelmn]

Opps. Wrong bug :). Deleting those.