threadp.cc

   1 /*
   2     Copyright 2004-2005 Chris Tallon
   3
   4     This file is part of VOMP.
   5
   6     VOMP is free software; you can redistribute it and/or modify
   7     it under the terms of the GNU General Public License as published by
   8     the Free Software Foundation; either version 2 of the License, or
   9     (at your option) any later version.
  10
  11     VOMP is distributed in the hope that it will be useful,
  12     but WITHOUT ANY WARRANTY; without even the implied warranty of
  13     MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  14     GNU General Public License for more details.
  15
  16     You should have received a copy of the GNU General Public License
  17     along with VOMP; if not, write to the Free Software
  18     Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA  02110-1301, USA.
  19 */
  20
  21 #include "threadp.h"
  22
  23 // Undeclared functions, only for use in this file to start the thread
  24 void threadPInternalStart(void *arg)
  25 {
  26   // I don't want signals
  27   sigset_t sigs;
  28   sigfillset(&sigs);
  29   pthread_sigmask(SIG_BLOCK, &sigs, NULL);
  30
  31   Thread *t = (Thread *)arg;
  32   t->threadInternalStart2();
  33 }
  34
  35 int ThreadP::threadStart()
  36 {
  37   pthread_cond_init(&threadCond, NULL);
  38   pthread_mutex_init(&threadCondMutex, NULL);
  39
  40   threadActive = 1;
  41   if (pthread_create(&pthread, NULL, (void*(*)(void*))threadPInternalStart, (void *)this) == -1) return 0;
  42   return 1;
  43 }
  44
  45 void ThreadP::threadStop()
  46 {
  47         if (threadActive) { // we need this, on some implementations this will fail, if already stopped
  48
  49                 threadLock();
  50                 threadActive = 0; // New locking around this fixes a player lockup but could badly affect other things
  51                 threadUnlock();
  52
  53                 // Signal thread here in case it's waiting
  54                 threadSignal();
  55                 pthread_join(pthread, NULL);
  56                 this->threadPostStopCleanup();
  57         }
  58 }
  59
  60
  61 void ThreadP::threadCancel()
  62 {
  63         if (threadActive) {
  64                 threadActive = 0;
  65                 pthread_cancel(pthread);
  66                 pthread_join(pthread, NULL);
  67                 this->threadPostStopCleanup();
  68         }
  69 }
  70
  71
  72 void ThreadP::threadCheckExit()
  73 {
  74   if (!threadActive) pthread_exit(NULL);
  75 }
  76
  77 void ThreadP::threadLock()
  78 {
  79   pthread_mutex_lock(&threadCondMutex);
  80 }
  81
  82 void ThreadP::threadUnlock()
  83 {
  84   pthread_mutex_unlock(&threadCondMutex);
  85 }
  86
  87 void ThreadP::threadSignal()
  88 {
  89   pthread_mutex_lock(&threadCondMutex);
  90   pthread_cond_signal(&threadCond);
  91   pthread_mutex_unlock(&threadCondMutex);
  92 }
  93
  94 void ThreadP::threadSignalNoLock()
  95 {
  96   pthread_cond_signal(&threadCond);
  97 }
  98
  99 void ThreadP::threadWaitForSignal()
 100 {
 101   pthread_cond_wait(&threadCond, &threadCondMutex);
 102 }
 103
 104 void ThreadP::threadWaitForSignalTimed(struct timespec* ts)
 105 {
 106   pthread_cond_timedwait(&threadCond, &threadCondMutex, ts);
 107 }
 108
 109 void ThreadP::threadSetKillable()
 110 {
 111   pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
 112   pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, NULL);
 113 }
 114
 115
 116 pthread_t ThreadP::getThreadID() // returns the ID of this thread
 117 {
 118   return pthread;
 119 }
 120
 121 // Static functions
 122
 123 void ThreadP::threadSuicide()
 124 {
 125   if(!pthread_detach(pthread_self()))
 126   {
 127     MILLISLEEP(1000);
 128     if(!pthread_detach(pthread_self()))
 129     {
 130       MILLISLEEP(1000);
 131       pthread_detach(pthread_self());
 132     }
 133   }
 134
 135   pthread_exit(NULL);
 136 }
 137
 138 pthread_t ThreadP::thisThreadID() // returns the ID of the calling thread
 139 {
 140   return pthread_self();
 141 }