cec: make libudev optional. if libudev is not available on linux, adapter autodetecti...
[deb_libcec.git] / src / lib / platform / threads.cpp
1 /*
2 * This file is part of the libCEC(R) library.
3 *
4 * libCEC(R) is Copyright (C) 2011 Pulse-Eight Limited. All rights reserved.
5 * libCEC(R) is an original work, containing original code.
6 *
7 * libCEC(R) is a trademark of Pulse-Eight Limited.
8 *
9 * This program is dual-licensed; you can redistribute it and/or modify
10 * it under the terms of the GNU General Public License as published by
11 * the Free Software Foundation; either version 2 of the License, or
12 * (at your option) any later version.
13 *
14 * This program is distributed in the hope that it will be useful,
15 * but WITHOUT ANY WARRANTY; without even the implied warranty of
16 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
17 * GNU General Public License for more details.
18 *
19 * You should have received a copy of the GNU General Public License
20 * along with this program; if not, write to the Free Software
21 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
22 *
23 *
24 * Alternatively, you can license this library under a commercial license,
25 * please contact Pulse-Eight Licensing for more information.
26 *
27 * For more information contact:
28 * Pulse-Eight Licensing <license@pulse-eight.com>
29 * http://www.pulse-eight.com/
30 * http://www.pulse-eight.net/
31 */
32
33 #include "threads.h"
34 #include "timeutils.h"
35
36 using namespace CEC;
37
38 CMutex::CMutex(void)
39 {
40 pthread_mutex_init(&m_mutex, NULL);
41 }
42
43 CMutex::~CMutex(void)
44 {
45 pthread_mutex_destroy(&m_mutex);
46 }
47
48 bool CMutex::TryLock(void)
49 {
50 return (pthread_mutex_trylock(&m_mutex) == 0);
51 }
52
53 bool CMutex::Lock(void)
54 {
55 return (pthread_mutex_lock(&m_mutex) == 0);
56 }
57
58 void CMutex::Unlock(void)
59 {
60 pthread_mutex_unlock(&m_mutex);
61 }
62
63 CLockObject::CLockObject(CMutex *mutex, bool bTryLock /* = false */) :
64 m_mutex(mutex)
65 {
66 if (m_mutex)
67 m_bLocked = bTryLock ? m_mutex->TryLock() : m_mutex->Lock();
68 }
69
70 CLockObject::~CLockObject(void)
71 {
72 Leave();
73 m_mutex = NULL;
74 }
75
76 void CLockObject::Leave(void)
77 {
78 if (m_mutex && m_bLocked)
79 {
80 m_bLocked = false;
81 m_mutex->Unlock();
82 }
83 }
84
85 void CLockObject::Lock(void)
86 {
87 if (m_mutex)
88 m_bLocked = m_mutex->Lock();
89 }
90
91 CCondition::CCondition(void)
92 {
93 pthread_cond_init(&m_cond, NULL);
94 }
95
96 CCondition::~CCondition(void)
97 {
98 pthread_cond_broadcast(&m_cond);
99 pthread_cond_destroy(&m_cond);
100 }
101
102 void CCondition::Broadcast(void)
103 {
104 pthread_cond_broadcast(&m_cond);
105 }
106
107 void CCondition::Signal(void)
108 {
109 pthread_cond_signal(&m_cond);
110 }
111
112 bool CCondition::Wait(CMutex *mutex, uint32_t iTimeout /* = 0 */)
113 {
114 bool bReturn(false);
115 sched_yield();
116 if (mutex)
117 {
118 if (iTimeout > 0)
119 {
120 struct timespec abstime;
121 struct timeval now;
122 gettimeofday(&now, NULL);
123 iTimeout += now.tv_usec / 1000;
124 abstime.tv_sec = now.tv_sec + (time_t)(iTimeout / 1000);
125 abstime.tv_nsec = (int32_t)((iTimeout % (uint32_t)1000) * (uint32_t)1000000);
126 bReturn = (pthread_cond_timedwait(&m_cond, &mutex->m_mutex, &abstime) == 0);
127 }
128 else
129 {
130 bReturn = (pthread_cond_wait(&m_cond, &mutex->m_mutex) == 0);
131 }
132 }
133
134 return bReturn;
135 }
136
137 void CCondition::Sleep(uint32_t iTimeout)
138 {
139 CCondition w;
140 CMutex m;
141 CLockObject lock(&m);
142 w.Wait(&m, iTimeout);
143 }
144
145 CThread::CThread(void) :
146 m_bStop(false),
147 m_bRunning(false)
148 {
149 }
150
151 CThread::~CThread(void)
152 {
153 StopThread();
154 }
155
156 bool CThread::CreateThread(bool bWait /* = true */)
157 {
158 bool bReturn(false);
159
160 CLockObject lock(&m_threadMutex);
161 m_bStop = false;
162 if (!m_bRunning && pthread_create(&m_thread, NULL, (void *(*) (void *))&CThread::ThreadHandler, (void *)this) == 0)
163 {
164 if (bWait)
165 m_threadCondition.Wait(&m_threadMutex);
166 bReturn = true;
167 }
168
169 return bReturn;
170 }
171
172 void *CThread::ThreadHandler(CThread *thread)
173 {
174 void *retVal = NULL;
175
176 if (thread)
177 {
178 CLockObject lock(&thread->m_threadMutex);
179 thread->m_bRunning = true;
180 lock.Leave();
181 thread->m_threadCondition.Broadcast();
182
183 retVal = thread->Process();
184
185 lock.Lock();
186 thread->m_bRunning = false;
187 lock.Leave();
188 thread->m_threadCondition.Broadcast();
189 }
190
191 return retVal;
192 }
193
194 bool CThread::StopThread(bool bWaitForExit /* = true */)
195 {
196 bool bReturn(true);
197 m_bStop = true;
198
199 m_threadCondition.Broadcast();
200
201 void *retVal;
202 if (bWaitForExit && m_bRunning)
203 bReturn = (pthread_join(m_thread, &retVal) == 0);
204
205 return bReturn;
206 }
207
208 bool CThread::Sleep(uint32_t iTimeout)
209 {
210 CLockObject lock(&m_threadMutex);
211 return m_bStop ? false : m_threadCondition.Wait(&m_threadMutex, iTimeout);
212 }