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Signed-off-by: Antonio Pena Monferrer <apenya@mcs.anl.gov>

We now use a target structure for each target ID that we want to send
data to.  This allows us to separate out target-specific states and
more cleanly manage operations to a single target.
Signed-off-by: Antonio Pena Monferrer <apenya@mcs.anl.gov>

Antonio J. Pena authored Oct 22, 2014 and Kenneth Raffenetti committed Nov 12, 2014

Full redesign, mainly of the functions in ptl_nm.c and the
communications involving the "control" portal. Still some
problems with flow control.
Signed-off-by: Ken Raffenetti <raffenet@mcs.anl.gov>

There is a complete overhaul of this file on the way, but in the meantime
we raise these limits to prevent deadlock in MPI_Finalize with process
count >= 12.

No reviewer.

Pavan Balaji authored Oct 21, 2014 and Kenneth Raffenetti committed Nov 03, 2014

Portals4 by itself does not provide any flow-control.  This needs to
be managed by an upper-layer, such as MPICH.  Before this patch we
were relying on a bunch of unexpected buffers that were posted to the
portals library to manage unexpected messages.  However, since portals
asynchronously pulls out messages from the network, if the application
is delayed, it might result in the unexpected buffers being filled out
and the portal disabled.  This would cause MPICH to abort.

In this patch, we implement an initial version of flow-control that
allows us to reenable the portal when it gets disabled.  All this is
done in the context of the "rportals" wrappers that are implemented in
the rptl.* files.  We create an extra control portal that is only used
by rportals.  When the primary data portal gets disabled, the target
sends PAUSE messages to all other processes.  Once each process
confirms that it has no outstanding packets on the wire (i.e., all
packets have either been ACKed or NACKed), it sends a PAUSE-ACK
message.  When the target receives PAUSE-ACK messages from all
processes (thus confirming that the network traffic to itself has been
quiesced), it reenables the portal and sends an UNPAUSE message to all
processes.

This patch still does not deal with origin-side resource exhaustion.
This can happen, for example, if we run out of space on the event
queue on the origin side.
Signed-off-by: Ken Raffenetti <raffenet@mcs.anl.gov>

We were not setting the function states correctly in a bunch of
functions.

Modifications by Wesley to split up big commit.
Signed-off-by: Wesley Bland <wbland@anl.gov>
Signed-off-by: Pavan Balaji <balaji@anl.gov>

Pass tail pointer to single direction linked-list API so that
we optimize CONCAT and APPEND operations from O(N) to O(1).

Note that we do not need MPL_LL_APPEND_VS2008 anymore because
we no longer need to work around temporary variable. Similiarly,
we can support MPL_LL_CONCAT for VS2008 now.
Signed-off-by: Pavan Balaji <balaji@anl.gov>