eventloop.cpp
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1 /*
2  *
3  * D-Bus++ - C++ bindings for D-Bus
4  *
5  * Copyright (C) 2005-2007 Paolo Durante <shackan@gmail.com>
6  *
7  *
8  * This library is free software; you can redistribute it and/or
9  * modify it under the terms of the GNU Lesser General Public
10  * License as published by the Free Software Foundation; either
11  * version 2.1 of the License, or (at your option) any later version.
12  *
13  * This library is distributed in the hope that it will be useful,
14  * but WITHOUT ANY WARRANTY; without even the implied warranty of
15  * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
16  * Lesser General Public License for more details.
17  *
18  * You should have received a copy of the GNU Lesser General Public
19  * License along with this library; if not, write to the Free Software
20  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA
21  *
22  */
23 
24 #ifdef HAVE_CONFIG_H
25 #include <config.h>
26 #endif
27 
28 #include <dbus-c++/eventloop.h>
29 #include <dbus-c++/debug.h>
30 
31 #include <sys/poll.h>
32 #include <sys/time.h>
33 
34 #include <dbus/dbus.h>
35 
36 using namespace DBus;
37 using namespace std;
38 
39 static double millis(timeval tv)
40 {
41  return (tv.tv_sec * 1000.0 + tv.tv_usec / 1000.0);
42 }
43 
44 DefaultTimeout::DefaultTimeout(int interval, bool repeat, DefaultMainLoop *ed)
45  : _enabled(true), _interval(interval), _repeat(repeat), _expiration(0), _data(0), _disp(ed)
46 {
47  timeval now;
48  gettimeofday(&now, NULL);
49 
50  _expiration = millis(now) + interval;
51 
52  _disp->_mutex_t.lock();
53  _disp->_timeouts.push_back(this);
55 }
56 
58 {
59  _disp->_mutex_t.lock();
60  _disp->_timeouts.remove(this);
62 }
63 
65  : _enabled(true), _fd(fd), _flags(flags), _state(0), _data(0), _disp(ed)
66 {
67  _disp->_mutex_w.lock();
68  _disp->_watches.push_back(this);
70 }
71 
73 {
74  _disp->_mutex_w.lock();
75  _disp->_watches.remove(this);
77 }
78 
80 {
81  pthread_mutex_init(&_mutex, NULL);
82 }
83 
85 {
86  if (recursive)
87  {
88  pthread_mutexattr_t attr;
89 
90  pthread_mutexattr_init(&attr);
91  pthread_mutexattr_settype(&attr, PTHREAD_MUTEX_RECURSIVE);
92  pthread_mutex_init(&_mutex, &attr);
93  }
94  else
95  {
96  pthread_mutex_init(&_mutex, NULL);
97  }
98 }
99 
101 {
102  pthread_mutex_destroy(&_mutex);
103 }
104 
106 {
107  pthread_mutex_lock(&_mutex);
108 }
109 
111 {
112  pthread_mutex_unlock(&_mutex);
113 }
114 
116  _mutex_w(true)
117 {
118 }
119 
121 {
122  _mutex_w.lock();
123 
124  DefaultWatches::iterator wi = _watches.begin();
125  while (wi != _watches.end())
126  {
127  DefaultWatches::iterator wmp = wi;
128  ++wmp;
129  _mutex_w.unlock();
130  delete(*wi);
131  _mutex_w.lock();
132  wi = wmp;
133  }
134  _mutex_w.unlock();
135 
136  _mutex_t.lock();
137 
138  DefaultTimeouts::iterator ti = _timeouts.begin();
139  while (ti != _timeouts.end())
140  {
141  DefaultTimeouts::iterator tmp = ti;
142  ++tmp;
143  _mutex_t.unlock();
144  delete(*ti);
145  _mutex_t.lock();
146  ti = tmp;
147  }
148  _mutex_t.unlock();
149 }
150 
152 {
153  _mutex_w.lock();
154 
155  int nfd = _watches.size();
156 
157  if (_fdunlock)
158  {
159  nfd = nfd + 2;
160  }
161 
162  pollfd fds[nfd];
163 
164  DefaultWatches::iterator wi = _watches.begin();
165 
166  for (nfd = 0; wi != _watches.end(); ++wi)
167  {
168  if ((*wi)->enabled())
169  {
170  fds[nfd].fd = (*wi)->descriptor();
171  fds[nfd].events = (*wi)->flags();
172  fds[nfd].revents = 0;
173 
174  ++nfd;
175  }
176  }
177 
178  if (_fdunlock)
179  {
180  fds[nfd].fd = _fdunlock[0];
181  fds[nfd].events = POLLIN | POLLOUT | POLLPRI ;
182  fds[nfd].revents = 0;
183 
184  nfd++;
185  fds[nfd].fd = _fdunlock[1];
186  fds[nfd].events = POLLIN | POLLOUT | POLLPRI ;
187  fds[nfd].revents = 0;
188  }
189 
190  _mutex_w.unlock();
191 
192  int wait_min = 10000;
193 
194  DefaultTimeouts::iterator ti;
195 
196  _mutex_t.lock();
197 
198  for (ti = _timeouts.begin(); ti != _timeouts.end(); ++ti)
199  {
200  if ((*ti)->enabled() && (*ti)->interval() < wait_min)
201  wait_min = (*ti)->interval();
202  }
203 
204  _mutex_t.unlock();
205 
206  poll(fds, nfd, wait_min);
207 
208  timeval now;
209  gettimeofday(&now, NULL);
210 
211  double now_millis = millis(now);
212 
213  _mutex_t.lock();
214 
215  ti = _timeouts.begin();
216 
217  while (ti != _timeouts.end())
218  {
219  DefaultTimeouts::iterator tmp = ti;
220  ++tmp;
221 
222  if ((*ti)->enabled() && now_millis >= (*ti)->_expiration)
223  {
224  (*ti)->expired(*(*ti));
225 
226  if ((*ti)->_repeat)
227  {
228  (*ti)->_expiration = now_millis + (*ti)->_interval;
229  }
230 
231  }
232 
233  ti = tmp;
234  }
235 
236  _mutex_t.unlock();
237 
238  _mutex_w.lock();
239 
240  for (int j = 0; j < nfd; ++j)
241  {
242  DefaultWatches::iterator wi;
243 
244  for (wi = _watches.begin(); wi != _watches.end();)
245  {
246  DefaultWatches::iterator tmp = wi;
247  ++tmp;
248 
249  if ((*wi)->enabled() && (*wi)->_fd == fds[j].fd)
250  {
251  if (fds[j].revents)
252  {
253  (*wi)->_state = fds[j].revents;
254 
255  (*wi)->ready(*(*wi));
256 
257  fds[j].revents = 0;
258  }
259  }
260 
261  wi = tmp;
262  }
263  }
264  _mutex_w.unlock();
265 }
266 
DefaultWatches _watches
Definition: eventloop.h:217
DefaultTimeouts _timeouts
Definition: eventloop.h:214
DefaultTimeout(int interval, bool repeat, DefaultMainLoop *)
Definition: eventloop.cpp:44
DefaultMutex _mutex_w
Definition: eventloop.h:216
STL namespace.
DefaultMutex _mutex_t
Definition: eventloop.h:213
virtual ~DefaultTimeout()
Definition: eventloop.cpp:57
virtual ~DefaultWatch()
Definition: eventloop.cpp:72
DefaultMainLoop * _disp
Definition: eventloop.h:167
virtual void dispatch()
Definition: eventloop.cpp:151
pthread_mutex_t _mutex
Definition: eventloop.h:197
DefaultMainLoop * _disp
Definition: eventloop.h:103
static double millis(timeval tv)
Definition: eventloop.cpp:39
DefaultWatch(int fd, int flags, DefaultMainLoop *)
Definition: eventloop.cpp:64
virtual ~DefaultMainLoop()
Definition: eventloop.cpp:120