A Discrete-Event Network Simulator
API
block-ack-window.cc
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1/* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2/*
3 * Copyright (c) 2019 Universita' degli Studi di Napoli Federico II
4 *
5 * This program is free software; you can redistribute it and/or modify
6 * it under the terms of the GNU General Public License version 2 as
7 * published by the Free Software Foundation;
8 *
9 * This program is distributed in the hope that it will be useful,
10 * but WITHOUT ANY WARRANTY; without even the implied warranty of
11 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
12 * GNU General Public License for more details.
13 *
14 * You should have received a copy of the GNU General Public License
15 * along with this program; if not, write to the Free Software
16 * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
17 *
18 * Author: Stefano Avallone <stavallo@unina.it>
19 */
20
21#include "ns3/log.h"
22#include "block-ack-window.h"
23#include "wifi-utils.h"
24
25namespace ns3 {
26
27NS_LOG_COMPONENT_DEFINE ("BlockAckWindow");
28
30 : m_winStart (0),
31 m_head (0)
32{
33}
34
35void
36BlockAckWindow::Init (uint16_t winStart, uint16_t winSize)
37{
38 NS_LOG_FUNCTION (this << winStart << winSize);
39 m_winStart = winStart;
40 m_window.assign (winSize, false);
41 m_head = 0;
42}
43
44void
45BlockAckWindow::Reset (uint16_t winStart)
46{
47 Init (winStart, m_window.size ());
48}
49
50uint16_t
52{
53 return m_winStart;
54}
55
56uint16_t
58{
59 return (m_winStart + m_window.size () - 1) % SEQNO_SPACE_SIZE;
60}
61
62std::size_t
64{
65 return m_window.size ();
66}
67
69BlockAckWindow::At (std::size_t distance)
70{
71 NS_ASSERT (distance < m_window.size ());
72
73 return m_window.at ((m_head + distance) % m_window.size ());
74}
75
76std::vector<bool>::const_reference
77BlockAckWindow::At (std::size_t distance) const
78{
79 NS_ASSERT (distance < m_window.size ());
80
81 return m_window.at ((m_head + distance) % m_window.size ());
82}
83
84void
85BlockAckWindow::Advance (std::size_t count)
86{
87 NS_LOG_FUNCTION (this << count);
88
89 if (count >= m_window.size ())
90 {
91 Reset ((m_winStart + count) % SEQNO_SPACE_SIZE);
92 return;
93 }
94
95 for (std::size_t i = 0; i < count; i++)
96 {
97 m_window[m_head] = false;
98 m_head = (m_head + 1) % m_window.size ();
99 }
101}
102
103} //namespace ns3
void Reset(uint16_t winStart)
Reset the window by clearing all the elements and setting winStart to the given value.
BlockAckWindow()
Constructor.
std::size_t GetWinSize(void) const
Get the window size.
void Advance(std::size_t count)
Advance the current winStart by the given number of positions.
uint16_t GetWinStart(void) const
Get the current winStart value.
uint16_t m_winStart
window start (sequence number)
std::size_t m_head
index of winStart in the vector
void Init(uint16_t winStart, uint16_t winSize)
Initialize the window with the given starting sequence number and size.
std::vector< bool > m_window
window
std::vector< bool >::reference At(std::size_t distance)
Get a reference to the element in the window having the given distance from the current winStart.
uint16_t GetWinEnd(void) const
Get the current winEnd value.
#define NS_ASSERT(condition)
At runtime, in debugging builds, if this condition is not true, the program prints the source file,...
Definition: assert.h:67
#define NS_LOG_COMPONENT_DEFINE(name)
Define a Log component with a specific name.
Definition: log.h:206
#define NS_LOG_FUNCTION(parameters)
If log level LOG_FUNCTION is enabled, this macro will output all input parameters separated by ",...
Every class exported by the ns3 library is enclosed in the ns3 namespace.
static constexpr uint16_t SEQNO_SPACE_SIZE
Size of the space of sequence numbers.
Definition: wifi-utils.h:131