dc304f056e9b7472fbaac95874dd17ea4ee9f042
[deb_libcec.git] / threads.h
1 #pragma once
2 /*
3 * This file is part of the libCEC(R) library.
4 *
5 * libCEC(R) is Copyright (C) 2011-2013 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 m_thread(INVALID_THREAD_VALUE) {}
46
47 virtual ~CThread(void)
48 {
49 StopThread(0);
50 void *retVal = NULL;
51 if (m_thread != INVALID_THREAD_VALUE)
52 if (ThreadsWait(m_thread, &retVal)){}; // silence unused warning
53 }
54
55 static void *ThreadHandler(CThread *thread)
56 {
57 void *retVal = NULL;
58
59 if (thread)
60 {
61 {
62 CLockObject lock(thread->m_threadMutex);
63 thread->m_bRunning = true;
64 thread->m_bStopped = false;
65 thread->m_threadCondition.Broadcast();
66 }
67
68 retVal = thread->Process();
69
70 {
71 CLockObject lock(thread->m_threadMutex);
72 thread->m_bRunning = false;
73 thread->m_bStopped = true;
74 thread->m_threadCondition.Broadcast();
75 }
76 }
77
78 return retVal;
79 }
80
81 virtual bool IsRunning(void)
82 {
83 CLockObject lock(m_threadMutex);
84 return m_bRunning;
85 }
86
87 virtual bool IsStopped(void)
88 {
89 CLockObject lock(m_threadMutex);
90 return m_bStop;
91 }
92
93 virtual bool CreateThread(bool bWait = true)
94 {
95 bool bReturn(false);
96 CLockObject lock(m_threadMutex);
97 if (!IsRunning())
98 {
99 m_bStop = false;
100 if (ThreadsCreate(m_thread, CThread::ThreadHandler, ((void*)static_cast<CThread *>(this))))
101 {
102 if (bWait)
103 m_threadCondition.Wait(m_threadMutex, m_bRunning);
104 bReturn = true;
105 }
106 }
107 return bReturn;
108 }
109
110 /*!
111 * @brief Stop the thread
112 * @param iWaitMs negative = don't wait, 0 = infinite, or the amount of ms to wait
113 */
114 virtual bool StopThread(int iWaitMs = 5000)
115 {
116 bool bReturn(true);
117 bool bRunning(false);
118 {
119 CLockObject lock(m_threadMutex);
120 bRunning = IsRunning();
121 m_bStop = true;
122 }
123
124 if (bRunning && iWaitMs >= 0)
125 {
126 CLockObject lock(m_threadMutex);
127 bReturn = m_threadCondition.Wait(m_threadMutex, m_bStopped, iWaitMs);
128 }
129 else
130 {
131 bReturn = true;
132 }
133
134 return bReturn;
135 }
136
137 virtual bool Sleep(uint32_t iTimeout)
138 {
139 CLockObject lock(m_threadMutex);
140 return m_bStop ? false : m_threadCondition.Wait(m_threadMutex, m_bStopped, iTimeout);
141 }
142
143 virtual void *Process(void) = 0;
144
145 protected:
146 void SetRunning(bool bSetTo);
147 CMutex m_threadMutex;
148
149 private:
150 bool m_bStop;
151 bool m_bRunning;
152 bool m_bStopped;
153 CCondition<bool> m_threadCondition;
154 thread_t m_thread;
155 };
156 };