csm_dosndrecv

INTERFACE:

   subroutine csm_dosndrcv (doalb)

DESCRIPTION:

   Determine when to send and receive messages to/from the
   flux coupler on this time-step.
   Determine if send/receive information to/from flux coupler
   Send msgs (land state and fluxes) to the flux coupler only when 
   doalb is true (i.e. on time steps before the atm does a solar
   radiation computation). Receive msgs (atm state) from the
   flux coupler only when dorad is true (i.e. on time steps 
   when the atm does a solar radiation computation). 
   The fluxes are then averaged between the send and receive calls.

USES:

     use clm_varctl   , only : csm_doflxave
     use time_manager , only : get_step_size, get_nstep
     use shr_const_mod, only : SHR_CONST_CDAY

ARGUMENTS:

     implicit none
     logical, intent(in) :: doalb  !true=>next timestep a radiation time step

REVISION HISTORY:

    02.09.17 Mariana Vertenstein Updated to clm2_1 data structures