src/lib/platform/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 using namespace CEC;
  37
  38 CMutex::CMutex(void)
  39 {
  40   pthread_mutex_init(&m_mutex, NULL);
  41 }
  42
  43 CMutex::~CMutex(void)
  44 {
  45   pthread_mutex_destroy(&m_mutex);
  46 }
  47
  48 bool CMutex::TryLock(void)
  49 {
  50   return (pthread_mutex_trylock(&m_mutex) == 0);
  51 }
  52
  53 bool CMutex::Lock(void)
  54 {
  55   return (pthread_mutex_lock(&m_mutex) == 0);
  56 }
  57
  58 void CMutex::Unlock(void)
  59 {
  60   pthread_mutex_unlock(&m_mutex);
  61 }
  62
  63 CLockObject::CLockObject(CMutex *mutex) :
  64   m_mutex(mutex)
  65 {
  66   m_mutex->Lock();
  67 }
  68
  69 CLockObject::~CLockObject(void)
  70 {
  71   Leave();
  72   m_mutex = NULL;
  73 }
  74
  75 void CLockObject::Leave(void)
  76 {
  77   m_mutex->Unlock();
  78 }
  79
  80 void CLockObject::Lock(void)
  81 {
  82   m_mutex->Lock();
  83 }
  84
  85 CCondition::CCondition(void)
  86 {
  87   pthread_cond_init(&m_cond, NULL);
  88 }
  89
  90 CCondition::~CCondition(void)
  91 {
  92   pthread_cond_broadcast(&m_cond);
  93   pthread_cond_destroy(&m_cond);
  94 }
  95
  96 void CCondition::Signal(void)
  97 {
  98   pthread_cond_broadcast(&m_cond);
  99 }
 100
 101 bool CCondition::Wait(CMutex *mutex, int64_t iTimeout)
 102 {
 103   bool bReturn(false);
 104   struct timespec abstime;
 105   struct timeval now;
 106   if (gettimeofday(&now, NULL) == 0)
 107   {
 108     iTimeout       += now.tv_usec / 1000;
 109     abstime.tv_sec  = now.tv_sec + (time_t)(iTimeout / 1000);
 110     abstime.tv_nsec = (long)((iTimeout % (unsigned long)1000) * (unsigned long)1000000);
 111     bReturn         = (pthread_cond_timedwait(&m_cond, &mutex->m_mutex, &abstime) == 0);
 112   }
 113
 114   return bReturn;
 115 }
 116
 117 void CCondition::Sleep(int iTimeout)
 118 {
 119   sched_yield();
 120   CCondition w;
 121   CMutex m;
 122   CLockObject lock(&m);
 123   w.Wait(&m, iTimeout);
 124 }
 125
 126 CThread::CThread(void) :
 127     m_bRunning(false),
 128     m_bStop(false)
 129 {
 130 }
 131
 132 CThread::~CThread(void)
 133 {
 134   m_bStop = true;
 135   pthread_join(m_thread, NULL);
 136 }
 137
 138 bool CThread::CreateThread(void)
 139 {
 140   bool bReturn(false);
 141
 142   if (!m_bRunning && pthread_create(&m_thread, NULL, (void *(*) (void *))&CThread::ThreadHandler, (void *)this) == 0)
 143   {
 144     m_bRunning = true;
 145     pthread_detach(m_thread);
 146     bReturn = true;
 147   }
 148
 149   return bReturn;
 150 }
 151
 152 void *CThread::ThreadHandler(CThread *thread)
 153 {
 154   if (thread)
 155     return thread->Process();
 156   return NULL;
 157 }
 158
 159 void CThread::StopThread(bool bWaitForExit /* = true */)
 160 {
 161   m_bStop = true;
 162   if (bWaitForExit)
 163     pthread_join(m_thread, NULL);
 164 }