SequentialActivity.cpp
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1 /***************************************************************************
2  tag: Peter Soetens Thu Oct 22 11:59:08 CEST 2009 SequentialActivity.cpp
3 
4  SequentialActivity.cpp - description
5  -------------------
6  begin : Thu October 22 2009
7  copyright : (C) 2009 Peter Soetens
8  email : peter@thesourcworks.com
9 
10  ***************************************************************************
11  * This library is free software; you can redistribute it and/or *
12  * modify it under the terms of the GNU General Public *
13  * License as published by the Free Software Foundation; *
14  * version 2 of the License. *
15  * *
16  * As a special exception, you may use this file as part of a free *
17  * software library without restriction. Specifically, if other files *
18  * instantiate templates or use macros or inline functions from this *
19  * file, or you compile this file and link it with other files to *
20  * produce an executable, this file does not by itself cause the *
21  * resulting executable to be covered by the GNU General Public *
22  * License. This exception does not however invalidate any other *
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24  * Public License. *
25  * *
26  * This library is distributed in the hope that it will be useful, *
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35  * *
36  ***************************************************************************/
37 
38 
39 #include "SequentialActivity.hpp"
40 #include "../os/MainThread.hpp"
41 #include "../os/MutexLock.hpp"
42 
43 namespace RTT {
44  using namespace extras;
45  using namespace base;
46 
48  : ActivityInterface(run), running(false), active(false)
49  {
50  }
51 
53  {
54  stop();
55  }
56 
58  {
59  return 0.0;
60  }
61 
63  if ( s == 0.0)
64  return true;
65  return false;
66  }
67 
69  {
70  return ~0;
71  }
72 
74  {
75  return false;
76  }
77 
79  {
80  return os::MainThread::Instance();
81  }
82 
84  {
85  return true;
86  }
87 
89  {
90  }
91 
93  {
94  return false;
95  }
96 
97 
99  {
100  }
101 
103  {
104  if (active == true )
105  return false;
106 
107  active = true;
108 
109  if ( runner ? runner->initialize() : this->initialize() ) {
110  } else {
111  active = false;
112  }
113  return active;
114  }
115 
116 
118  {
119  if ( !active )
120  return false;
121 
122  if (runner)
123  runner->finalize();
124  else
125  this->finalize();
126  active = false;
127  return true;
128  }
129 
131  {
132  return running;
133  }
134 
136  {
137  return false;
138  }
139 
141  {
142  return active;
143  }
144 
146  {
147  // This function may recurse, in which case it returns true.
148  // We could also rely on the MutexTryLock to fail, but in
149  // case an OS only has recursive mutexes, we'd need to
150  // check running anyway before calling runner->step(). So
151  // we moved that piece of code up front.
152  // The other thread will complete the work. (hasWork).
153  if (running)
154  return true;
155  if ( active ) {
156  bool did_step = false;
157  do {
159  if ( lock.isSuccessful() ) {
160  running = true;
161  if (runner) {
162  runner->step();
163  runner->work(RunnableInterface::TimeOut); // for sequentials, every trigger is also a TimeOut...
164  } else {
165  this->step();
166  }
167  running = false;
168  did_step = true;
169  } else {
170  // nop: step() is already being executed and
171  // should notice that new data is there.
172  // race: step() returns and trigger is called->
173  // trigger is ignored.
174  return true;
175  }
176  // mutex unlocked here.
177  } // if the runner signals work again (ie a race occured),
178  // rety to lock.
179  while ( did_step && runner->hasWork() );
180  return true;
181  }
182  return false;
183  }
184 
186  {
187  return trigger();
188  }
189 
191  {
192  return false;
193  }
194 
195 
196 }
virtual void work(WorkReason reason)
double Seconds
Definition: os/Time.hpp:53
static ThreadInterface * Instance()
Definition: MainThread.cpp:58
SequentialActivity(base::RunnableInterface *run=0)
A class for running a certain piece of code in a thread.
Interface to start/stop and query a Activity.
A MutexTryLock tries to lock an Mutex object on construction and if successful, unlocks it on destruc...
Definition: MutexLock.hpp:87
virtual bool initialize()=0
Contains TaskContext, Activity, OperationCaller, Operation, Property, InputPort, OutputPort, Attribute.
Definition: Activity.cpp:53


rtt
Author(s): RTT Developers
autogenerated on Tue Jun 25 2019 19:33:28