src/lib/util/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 CMutex::CMutex(void)
  37 {
  38   pthread_mutex_init(&m_mutex, NULL);
  39 }
  40
  41 CMutex::~CMutex(void)
  42 {
  43   pthread_mutex_destroy(&m_mutex);
  44 }
  45
  46 bool CMutex::TryLock(void)
  47 {
  48   return (pthread_mutex_trylock(&m_mutex) == 0);
  49 }
  50
  51 bool CMutex::Lock(void)
  52 {
  53   return (pthread_mutex_lock(&m_mutex) == 0);
  54 }
  55
  56 void CMutex::Unlock(void)
  57 {
  58   pthread_mutex_unlock(&m_mutex);
  59 }
  60
  61 CLockObject::CLockObject(CMutex *mutex) :
  62   m_mutex(mutex)
  63 {
  64   m_mutex->Lock();
  65 }
  66
  67 CLockObject::~CLockObject(void)
  68 {
  69   Leave();
  70   m_mutex = NULL;
  71 }
  72
  73 void CLockObject::Leave(void)
  74 {
  75   m_mutex->Unlock();
  76 }
  77
  78 void CLockObject::Lock(void)
  79 {
  80   m_mutex->Lock();
  81 }
  82
  83 CCondition::CCondition(void)
  84 {
  85   pthread_cond_init(&m_cond, NULL);
  86 }
  87
  88 CCondition::~CCondition(void)
  89 {
  90   pthread_cond_broadcast(&m_cond);
  91   pthread_cond_destroy(&m_cond);
  92 }
  93
  94 void CCondition::Signal(void)
  95 {
  96   pthread_cond_broadcast(&m_cond);
  97 }
  98
  99 bool CCondition::Wait(CMutex *mutex, int64_t iTimeout)
 100 {
 101   bool bReturn(false);
 102   struct timespec abstime;
 103   struct timeval now;
 104   if (gettimeofday(&now, NULL) == 0)
 105   {
 106     iTimeout       += now.tv_usec / 1000;
 107     abstime.tv_sec  = now.tv_sec + (time_t)(iTimeout / 1000);
 108     abstime.tv_nsec = (long)((iTimeout % (unsigned long)1000) * (unsigned long)1000000);
 109     bReturn         = (pthread_cond_timedwait(&m_cond, &mutex->m_mutex, &abstime) == 0);
 110   }
 111
 112   return bReturn;
 113 }
 114
 115 void CCondition::Sleep(int iTimeout)
 116 {
 117   sched_yield();
 118   CCondition w;
 119   CMutex m;
 120   CLockObject lock(&m);
 121   w.Wait(&m, iTimeout);
 122 }
 123
 124 CThread::CThread(void) :
 125     m_bRunning(false),
 126     m_bStop(false)
 127 {
 128 }
 129
 130 CThread::~CThread(void)
 131 {
 132   m_bStop = true;
 133   pthread_join(m_thread, NULL);
 134 }
 135
 136 bool CThread::CreateThread(void)
 137 {
 138   bool bReturn(false);
 139
 140   if (!m_bRunning && pthread_create(&m_thread, NULL, (void *(*) (void *))&CThread::ThreadHandler, (void *)this) == 0)
 141   {
 142     m_bRunning = true;
 143     pthread_detach(m_thread);
 144     bReturn = true;
 145   }
 146
 147   return bReturn;
 148 }
 149
 150 void *CThread::ThreadHandler(CThread *thread)
 151 {
 152   if (thread)
 153     return thread->Process();
 154   return NULL;
 155 }
 156
 157 void CThread::StopThread(bool bWaitForExit /* = true */)
 158 {
 159   m_bStop = true;
 160   if (bWaitForExit)
 161     pthread_join(m_thread, NULL);
 162 }