@private
@defgroup iodesc_generate io descriptors, generating
@brief The io descriptor structure in defined in this subroutine
and subsequently used in @ref PIO_read_darray, @ref PIO_write_darray,
@ref PIO_put_var, @ref PIO_get_var calls (see pio_types).
@defgroup PIO_rearr_comm_fc_options PIO_rearr_comm_fc_options
@brief Type that defines the PIO rearranger options
@details
- enable_hs : Enable handshake (true/false)
- enable_isend : Enable Isends (true/false)
- max_pend_req : Maximum pending requests (To indicated unlimited
number of requests use PIO_REARR_COMM_UNLIMITED_PEND_REQ)