A Discrete-Event Network Simulator
API
 All Classes Namespaces Files Functions Variables Typedefs Enumerations Enumerator Friends Groups Pages
watchdog.cc
1 /* -*- Mode:C++; c-file-style:"gnu"; indent-tabs-mode:nil; -*- */
2 /*
3  * Copyright (c) 2007 INRIA
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: Mathieu Lacage <mathieu.lacage@sophia.inria.fr>
19  */
20 #include "watchdog.h"
21 #include "log.h"
22 
23 NS_LOG_COMPONENT_DEFINE ("Watchdog");
24 
25 namespace ns3 {
26 
27 Watchdog::Watchdog ()
28  : m_impl (0),
29  m_event (),
30  m_end (MicroSeconds (0))
31 {
33 }
34 
35 Watchdog::~Watchdog ()
36 {
37  NS_LOG_FUNCTION (this);
38  delete m_impl;
39 }
40 
41 void
43 {
44  NS_LOG_FUNCTION (this << delay);
45  Time end = Simulator::Now () + delay;
46  m_end = std::max (m_end, end);
47  if (m_event.IsRunning ())
48  {
49  return;
50  }
51  m_event = Simulator::Schedule (m_end - Now (), &Watchdog::Expire, this);
52 }
53 
54 void
55 Watchdog::Expire (void)
56 {
57  NS_LOG_FUNCTION (this);
58  if (m_end == Simulator::Now ())
59  {
60  m_impl->Invoke ();
61  }
62  else
63  {
64  m_event = Simulator::Schedule (m_end - Now (), &Watchdog::Expire, this);
65  }
66 }
67 
68 } // namespace ns3
69 
keep track of time unit.
Definition: nstime.h:149
#define NS_LOG_FUNCTION(parameters)
Definition: log.h:311
void Ping(Time delay)
Definition: watchdog.cc:42
#define NS_LOG_COMPONENT_DEFINE(name)
Definition: log.h:122
bool IsRunning(void) const
Definition: event-id.cc:59
#define NS_LOG_FUNCTION_NOARGS()
Definition: log.h:275
static EventId Schedule(Time const &time, MEM mem_ptr, OBJ obj)
Definition: simulator.h:820
static Time Now(void)
Definition: simulator.cc:179
Time Now(void)
create an ns3::Time instance which contains the current simulation time.
Definition: simulator.cc:286
Time MicroSeconds(uint64_t us)
create ns3::Time instances in units of microseconds.
Definition: nstime.h:615