| 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 | } |