cec: don't read without a timeout in CUSBCECAdapterCommunication::Process()
[deb_libcec.git] / src / lib / platform / threads / threads.h
1 #pragma once
2 /*
3 * This file is part of the libCEC(R) library.
4 *
5 * libCEC(R) is Copyright (C) 2011-2012 Pulse-Eight Limited. All rights reserved.
6 * libCEC(R) is an original work, containing original code.
7 *
8 * libCEC(R) is a trademark of Pulse-Eight Limited.
9 *
10 * This program is dual-licensed; 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 General Public License for more details.
19 *
20 * You should have received a copy of the GNU General Public License
21 * along with this program; if not, write to the Free Software
22 * Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA 02111-1307, USA.
23 *
24 *
25 * Alternatively, you can license this library under a commercial license,
26 * please contact Pulse-Eight Licensing for more information.
27 *
28 * For more information contact:
29 * Pulse-Eight Licensing <license@pulse-eight.com>
30 * http://www.pulse-eight.com/
31 * http://www.pulse-eight.net/
32 */
33
34 #include "mutex.h"
35
36 namespace PLATFORM
37 {
38 class CThread
39 {
40 public:
41 CThread(void) :
42 m_bStop(false),
43 m_bRunning(false),
44 m_bStopped(false) {}
45
46 virtual ~CThread(void)
47 {
48 StopThread(0);
49 }
50
51 static void *ThreadHandler(CThread *thread)
52 {
53 void *retVal = NULL;
54
55 if (thread)
56 {
57 {
58 CLockObject lock(thread->m_threadMutex);
59 thread->m_bRunning = true;
60 thread->m_bStopped = false;
61 thread->m_threadCondition.Broadcast();
62 }
63
64 retVal = thread->Process();
65
66 {
67 CLockObject lock(thread->m_threadMutex);
68 thread->m_bRunning = false;
69 thread->m_bStopped = true;
70 thread->m_threadCondition.Broadcast();
71 }
72 }
73
74 return retVal;
75 }
76
77 virtual bool IsRunning(void)
78 {
79 CLockObject lock(m_threadMutex);
80 return m_bRunning;
81 }
82
83 virtual bool IsStopped(void)
84 {
85 CLockObject lock(m_threadMutex);
86 return m_bStop;
87 }
88
89 virtual bool CreateThread(bool bWait = true)
90 {
91 bool bReturn(false);
92 CLockObject lock(m_threadMutex);
93 if (!IsRunning())
94 {
95 m_bStop = false;
96 if (ThreadsCreate(m_thread, CThread::ThreadHandler, ((void*)static_cast<CThread *>(this))))
97 {
98 if (bWait)
99 m_threadCondition.Wait(m_threadMutex, m_bRunning);
100 bReturn = true;
101 }
102 }
103 return bReturn;
104 }
105
106 /*!
107 * @brief Stop the thread
108 * @param iWaitMs negative = don't wait, 0 = infinite, or the amount of ms to wait
109 */
110 virtual bool StopThread(int iWaitMs = 5000)
111 {
112 bool bReturn(true);
113 bool bRunning(false);
114 {
115 CLockObject lock(m_threadMutex);
116 bRunning = IsRunning();
117 m_bStop = true;
118 }
119
120 if (bRunning && iWaitMs >= 0)
121 {
122 CLockObject lock(m_threadMutex);
123 bReturn = m_threadCondition.Wait(m_threadMutex, m_bStopped, iWaitMs);
124 }
125 else
126 {
127 bReturn = true;
128 }
129
130 return bReturn;
131 }
132
133 virtual bool Sleep(uint32_t iTimeout)
134 {
135 CLockObject lock(m_threadMutex);
136 return m_bStop ? false : m_threadCondition.Wait(m_threadMutex, m_bStopped, iTimeout);
137 }
138
139 virtual void *Process(void) = 0;
140
141 protected:
142 void SetRunning(bool bSetTo);
143
144 private:
145 bool m_bStop;
146 bool m_bRunning;
147 bool m_bStopped;
148 CCondition<bool> m_threadCondition;
149 CMutex m_threadMutex;
150 thread_t m_thread;
151 };
152 };