Fawkes API  Fawkes Development Version
qa_waitcond.cpp
1 
2 /***************************************************************************
3  * example_waitcond.cpp - wait condition example program
4  *
5  * Created: Sat Mar 01 15:13:44 2008
6  * Copyright 2006-2008 Tim Niemueller [www.niemueller.de]
7  *
8  ****************************************************************************/
9 
10 /* This program is free software; you can redistribute it and/or modify
11  * it under the terms of the GNU General Public License as published by
12  * the Free Software Foundation; either version 2 of the License, or
13  * (at your option) any later version.
14  *
15  * This program is distributed in the hope that it will be useful,
16  * but WITHOUT ANY WARRANTY; without even the implied warranty of
17  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
18  * GNU Library General Public License for more details.
19  *
20  * Read the full text in the LICENSE.GPL file in the doc directory.
21  */
22 
23 // Do not mention in API doc
24 /// @cond EXAMPLES
25 
26 #include <core/exception.h>
27 #include <core/threading/mutex.h>
28 #include <core/threading/thread.h>
29 #include <core/threading/wait_condition.h>
30 
31 #include <iostream>
32 #include <string>
33 
34 using namespace std;
35 using namespace fawkes;
36 
37 typedef enum { WAITER, WAKER } threadmode_t;
38 
39 class ExampleWaitCondThread : public Thread
40 {
41 public:
42  ExampleWaitCondThread(threadmode_t mode,
43  string tname,
44  WaitCondition *waitcond,
45  unsigned int sleep_time)
46  : Thread(tname.c_str(), Thread::OPMODE_CONTINUOUS)
47  {
48  mode_ = mode;
49  waitcond_ = waitcond;
50  sleep_time_ = sleep_time;
51  }
52 
53  virtual void
54  loop()
55  {
56  if (mode_ == WAITER) {
57  usleep(sleep_time_);
58  cout << name() << ": Waiting for waker" << endl;
59  try {
60  waitcond_->wait();
61  cout << name() << ": Woken up" << endl;
62  } catch (Exception &e) {
63  cout << name() << ": EXCEPTION" << endl;
64  e.print_trace();
65  }
66  } else { // WAKER
67  usleep(sleep_time_);
68  cout << name() << ": Waking waiter" << endl;
69  waitcond_->wake_all();
70  cout << name() << ": Woke waiter" << endl;
71  }
72  }
73 
74 private:
75  threadmode_t mode_;
76  WaitCondition *waitcond_;
77  unsigned int sleep_time_;
78 };
79 
80 int
81 main(int argc, char **argv)
82 {
83  WaitCondition *w = new WaitCondition();
84 
85  ExampleWaitCondThread *t1 = new ExampleWaitCondThread(WAITER, "waiter1", w, 0);
86  ExampleWaitCondThread *t2 = new ExampleWaitCondThread(WAITER, "waiter2", w, 0);
87  ExampleWaitCondThread *tw = new ExampleWaitCondThread(WAKER, "waker", w, 2458642);
88 
89  t1->start();
90  t2->start();
91  tw->start();
92 
93  t1->join();
94  t2->join();
95  tw->join();
96 
97  delete t1;
98  delete t2;
99  delete tw;
100 
101  delete w;
102 }
103 
104 /// @endcond
Wait until a given condition holds.
Fawkes library namespace.
Thread class encapsulation of pthreads.
Definition: thread.h:45
Base class for exceptions in Fawkes.
Definition: exception.h:35
void print_trace()
Prints trace to stderr.
Definition: exception.cpp:601