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//
// Copyright 2019 Ettus Research, a National Instruments brand
//
// SPDX-License-Identifier: GPL-3.0-or-later
//
#ifndef INCLUDED_UHDLIB_TRANSPORT_FRAME_RESERVATION_MGR_HPP
#define INCLUDED_UHDLIB_TRANSPORT_FRAME_RESERVATION_MGR_HPP
#include <uhd/config.hpp>
#include <uhd/exception.hpp>
#include <uhdlib/transport/link_if.hpp>
#include <unordered_map>
namespace uhd { namespace transport {
/*!
* Helper class to keep track of the number of frames reserved from a pair of links
*/
class frame_reservation_mgr
{
public:
struct frame_reservation_t
{
recv_link_if::sptr recv_link;
size_t num_recv_frames = 0;
send_link_if::sptr send_link;
size_t num_send_frames = 0;
};
void register_link(const recv_link_if::sptr& recv_link)
{
if (_recv_tbl[recv_link.get()] != 0) {
throw uhd::runtime_error("Recv link already attached to I/O service");
}
_recv_tbl[recv_link.get()] = 0;
}
void register_link(const send_link_if::sptr& send_link)
{
if (_send_tbl[send_link.get()] != 0) {
throw uhd::runtime_error("Send link already attached to I/O service");
}
_send_tbl[send_link.get()] = 0;
}
void unregister_link(const recv_link_if::sptr& recv_link)
{
auto link_ptr = recv_link.get();
UHD_ASSERT_THROW(_recv_tbl.count(link_ptr) != 0);
_recv_tbl.erase(link_ptr);
}
void unregister_link(const send_link_if::sptr& send_link)
{
auto link_ptr = send_link.get();
UHD_ASSERT_THROW(_send_tbl.count(link_ptr) != 0);
_send_tbl.erase(link_ptr);
}
void reserve_frames(const frame_reservation_t& reservation)
{
if (reservation.recv_link) {
const size_t rsvd_frames = _recv_tbl.at(reservation.recv_link.get());
const size_t capacity = reservation.recv_link->get_num_recv_frames();
if (rsvd_frames + reservation.num_recv_frames > capacity) {
throw uhd::runtime_error(
"Number of frames requested exceeds link recv frame capacity");
}
recv_link_if* link_ptr = reservation.recv_link.get();
_recv_tbl[link_ptr] = rsvd_frames + reservation.num_recv_frames;
}
if (reservation.send_link) {
const size_t rsvd_frames = _send_tbl.at(reservation.send_link.get());
const size_t capacity = reservation.send_link->get_num_send_frames();
if (rsvd_frames + reservation.num_send_frames > capacity) {
throw uhd::runtime_error(
"Number of frames requested exceeds link send frame capacity");
}
send_link_if* link_ptr = reservation.send_link.get();
_send_tbl[link_ptr] = rsvd_frames + reservation.num_send_frames;
}
}
void unreserve_frames(const frame_reservation_t& reservation)
{
if (reservation.recv_link) {
const size_t rsvd_frames = _recv_tbl.at(reservation.recv_link.get());
recv_link_if* link_ptr = reservation.recv_link.get();
_recv_tbl[link_ptr] = rsvd_frames - reservation.num_recv_frames;
}
if (reservation.send_link) {
const size_t rsvd_frames = _send_tbl.at(reservation.send_link.get());
send_link_if* link_ptr = reservation.send_link.get();
_send_tbl[link_ptr] = rsvd_frames - reservation.num_send_frames;
}
}
private:
std::unordered_map<recv_link_if*, size_t> _recv_tbl;
std::unordered_map<send_link_if*, size_t> _send_tbl;
};
}} // namespace uhd::transport
#endif /* INCLUDED_UHDLIB_TRANSPORT_FRAME_RESERVATION_MGR_HPP */
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