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6f14b512 LOK |
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(bool bRecursive /* = true */) : | |
39 | IMutex(bRecursive) | |
40 | { | |
41 | pthread_mutex_init(&m_mutex, bRecursive ? GetMutexAttribute() : NULL); | |
42 | } | |
43 | ||
44 | CMutex::~CMutex(void) | |
45 | { | |
46 | pthread_mutex_destroy(&m_mutex); | |
47 | } | |
48 | ||
49 | bool CMutex::TryLock(void) | |
50 | { | |
51 | return (pthread_mutex_trylock(&m_mutex) == 0); | |
52 | } | |
53 | ||
54 | bool CMutex::Lock(void) | |
55 | { | |
56 | return (pthread_mutex_lock(&m_mutex) == 0); | |
57 | } | |
58 | ||
59 | void CMutex::Unlock(void) | |
60 | { | |
61 | pthread_mutex_unlock(&m_mutex); | |
62 | } | |
63 | ||
64 | static pthread_mutexattr_t g_mutexAttr; | |
65 | pthread_mutexattr_t *CMutex::GetMutexAttribute() | |
66 | { | |
67 | static bool bAttributeInitialised = false; | |
68 | if (!bAttributeInitialised) | |
69 | { | |
70 | pthread_mutexattr_init(&g_mutexAttr); | |
71 | pthread_mutexattr_settype(&g_mutexAttr, PTHREAD_MUTEX_RECURSIVE); | |
72 | bAttributeInitialised = true; | |
73 | } | |
74 | return &g_mutexAttr; | |
75 | } | |
76 | ||
77 | CCondition::CCondition(void) | |
78 | { | |
79 | pthread_cond_init(&m_cond, NULL); | |
80 | } | |
81 | ||
82 | CCondition::~CCondition(void) | |
83 | { | |
84 | pthread_cond_broadcast(&m_cond); | |
85 | pthread_cond_destroy(&m_cond); | |
86 | } | |
87 | ||
88 | void CCondition::Broadcast(void) | |
89 | { | |
90 | pthread_cond_broadcast(&m_cond); | |
91 | } | |
92 | ||
93 | void CCondition::Signal(void) | |
94 | { | |
95 | pthread_cond_signal(&m_cond); | |
96 | } | |
97 | ||
98 | bool CCondition::Wait(IMutex *mutex, uint32_t iTimeout /* = 0 */) | |
99 | { | |
100 | bool bReturn(false); | |
101 | sched_yield(); | |
102 | CMutex *pmutex = static_cast<CMutex *>(mutex); | |
103 | if (pmutex) | |
104 | { | |
105 | if (iTimeout > 0) | |
106 | { | |
107 | struct timespec abstime; | |
108 | struct timeval now; | |
109 | gettimeofday(&now, NULL); | |
110 | iTimeout += now.tv_usec / 1000; | |
111 | abstime.tv_sec = now.tv_sec + (time_t)(iTimeout / 1000); | |
112 | abstime.tv_nsec = (int32_t)((iTimeout % (uint32_t)1000) * (uint32_t)1000000); | |
113 | bReturn = (pthread_cond_timedwait(&m_cond, &pmutex->m_mutex, &abstime) == 0); | |
114 | } | |
115 | else | |
116 | { | |
117 | bReturn = (pthread_cond_wait(&m_cond, &pmutex->m_mutex) == 0); | |
118 | } | |
119 | } | |
120 | return bReturn; | |
121 | } | |
122 | ||
123 | bool CThread::CreateThread(bool bWait /* = true */) | |
124 | { | |
125 | bool bReturn(false); | |
126 | CLockObject lock(m_threadMutex); | |
127 | m_bStop = false; | |
128 | if (!m_bRunning && pthread_create(&m_thread, NULL, (void *(*) (void *))&CThread::ThreadHandler, (void *)this) == 0) | |
129 | { | |
130 | if (bWait) | |
131 | m_threadCondition->Wait(m_threadMutex); | |
132 | bReturn = true; | |
133 | } | |
134 | return bReturn; | |
135 | } | |
136 | ||
137 | bool CThread::StopThread(bool bWaitForExit /* = true */) | |
138 | { | |
139 | bool bReturn = IThread::StopThread(bWaitForExit); | |
140 | ||
141 | void *retVal; | |
142 | if (bWaitForExit && m_bRunning) | |
143 | bReturn = (pthread_join(m_thread, &retVal) == 0); | |
144 | ||
145 | return bReturn; | |
146 | } | |
147 | ||
148 | void *CThread::ThreadHandler(CThread *thread) | |
149 | { | |
150 | void *retVal = NULL; | |
151 | ||
152 | if (thread) | |
153 | { | |
154 | CLockObject lock(thread->m_threadMutex); | |
155 | thread->m_bRunning = true; | |
156 | lock.Leave(); | |
157 | thread->m_threadCondition->Broadcast(); | |
158 | ||
159 | retVal = thread->Process(); | |
160 | ||
161 | lock.Lock(); | |
162 | thread->m_bRunning = false; | |
163 | lock.Leave(); | |
164 | thread->m_threadCondition->Broadcast(); | |
165 | } | |
166 | ||
167 | return retVal; | |
168 | } |