ESMF_VMSendR4 Subroutine

  subroutine ESMF_VMSendR4(vm, sendData, count, dstPet, keywordEnforcer, &
    syncflag, commhandle, rc)
!
! !ARGUMENTS:
    type(ESMF_VM),              intent(in)            :: vm
    real(ESMF_KIND_R4), target, intent(in)            :: sendData(:)
    integer,                    intent(in)            :: count
    integer,                    intent(in)            :: dstPet
type(ESMF_KeywordEnforcer), optional:: keywordEnforcer ! must use keywords below
    type(ESMF_Sync_Flag),       intent(in),  optional :: syncflag
    type(ESMF_CommHandle),      intent(out), optional :: commhandle
    integer,                    intent(out), optional :: rc
!
!EOPI
!------------------------------------------------------------------------------
    integer                 :: localrc      ! local return code
    integer(ESMF_KIND_I8)   :: size
    logical                 :: blocking
    type(ESMF_CommHandle)   :: localcommhandle

    ! initialize return code; assume routine not implemented
    localrc = ESMF_RC_NOT_IMPL
    if (present(rc)) rc = ESMF_RC_NOT_IMPL

    ! Check init status of arguments
    ESMF_INIT_CHECK_DEEP(ESMF_VMGetInit, vm, rc)

    ! Initialize commhandle to an invalid pointer
    if (present(commhandle)) commhandle%this = ESMF_NULL_POINTER

    ! Decide whether this is blocking or non-blocking
    blocking = .true. !default is blocking
    if (present(syncflag)) then
      if (syncflag == ESMF_SYNC_NONBLOCKING) blocking = .false. ! non-blocking
    endif
    
    if (count > 0) then
      ! There is data to be received
      size = count
      size = size * 4 ! 4 bytes
      ! Call into the C++ interface.
      if (blocking) then
        call c_ESMC_VMSend(vm, sendData, size, dstPet, localrc)
        if (ESMF_LogFoundError(localrc, ESMF_ERR_PASSTHRU, &
          ESMF_CONTEXT, rcToReturn=rc)) return
      else
        call c_ESMC_VMSendNB(vm, sendData, size, dstPet, localcommhandle, &
          localrc)
        if (ESMF_LogFoundError(localrc, ESMF_ERR_PASSTHRU, &
          ESMF_CONTEXT, rcToReturn=rc)) return
        ! Check if we need to pass back the commhandle
        if (present(commhandle)) then
          commhandle = localcommhandle  ! copy the commhandle pointer back
          ! Set init code
          ESMF_INIT_SET_CREATED(commhandle)
        endif
      endif
    endif

    ! return successfully
    if (present(rc)) rc = ESMF_SUCCESS

  end subroutine ESMF_VMSendR4