cinelerra-5.1/guicast/thread.C

   1
   2 /*
   3  * CINELERRA
   4  * Copyright (C) 2008 Adam Williams <broadcast at earthling dot net>
   5  *
   6  * This program 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  * This program 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 this program; if not, write to the Free Software
  18  * Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA
  19  *
  20  */
  21
  22 #include "bcsignals.h"
  23 #include <sys/wait.h>
  24 #include <sched.h>
  25 #include <signal.h>
  26 #include <stdio.h>
  27 #include <unistd.h>
  28 #include <string.h>
  29 #include <typeinfo>
  30 #include "thread.h"
  31
  32
  33 Thread::Thread(int synchronous, int realtime, int autodelete)
  34 {
  35         this->synchronous = synchronous != 0;
  36         this->realtime = realtime != 0;
  37         this->autodelete = autodelete != 0;
  38         tid = (pthread_t)-1;
  39         finished = false;
  40         cancelled = false;
  41         cancel_enabled = false;
  42 }
  43
  44 Thread::~Thread()
  45 {
  46 }
  47
  48 void* Thread::entrypoint(void *parameters)
  49 {
  50         Thread *thread = (Thread*)parameters;
  51
  52 // allow thread to be cancelled at any point during a region where it is enabled.
  53         pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, 0);
  54 // Disable cancellation by default.
  55         pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
  56         thread->cancel_enabled = false;
  57
  58 // Set realtime here seince it doesn't work in start
  59         if( thread->realtime && getuid() == 0 ) {
  60                 struct sched_param param = { sched_priority : 1 };
  61                 if(pthread_setschedparam(thread->tid, SCHED_RR, &param) < 0)
  62                         perror("Thread::entrypoint pthread_attr_setschedpolicy");
  63         }
  64
  65         thread->run();
  66         thread->finished = true;
  67         if( !thread->synchronous ) {
  68                 if( thread->autodelete ) delete thread;
  69                 else if( !thread->cancelled ) TheList::dbg_del(thread->tid);
  70                 else thread->tid = ((pthread_t)-1);
  71         }
  72         return NULL;
  73 }
  74
  75 void Thread::start()
  76 {
  77         pthread_attr_t  attr;
  78         struct sched_param param;
  79
  80         pthread_attr_init(&attr);
  81
  82 // previously run, and did not join, join to clean up zombie
  83         if( synchronous && exists() )
  84                 join();
  85
  86         finished = false;
  87         cancelled = false;
  88         owner = get_self();
  89
  90 // Inherit realtime from current thread the easy way.
  91         if( !realtime )
  92                 realtime = calculate_realtime();
  93
  94         if( !synchronous )
  95                 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
  96
  97         if( realtime && getuid() == 0 ) {
  98                 if(pthread_attr_setschedpolicy(&attr, SCHED_RR) < 0)
  99                         perror("Thread::start pthread_attr_setschedpolicy");
 100                 param.sched_priority = 50;
 101                 if(pthread_attr_setschedparam(&attr, &param) < 0)
 102                         perror("Thread::start pthread_attr_setschedparam");
 103         }
 104         else {
 105                 if(pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED) < 0)
 106                         perror("Thread::start pthread_attr_setinheritsched");
 107         }
 108
 109 // autodelete may delete this immediately after create
 110         int autodelete = this->autodelete;
 111
 112         pthread_create(&tid, &attr, Thread::entrypoint, this);
 113
 114         if( !autodelete )
 115                 TheList::dbg_add(tid, owner, typeid(*this).name());
 116 }
 117
 118 int Thread::cancel()
 119 {
 120         if( exists() && !cancelled ) {
 121                 LOCK_LOCKS("Thread::cancel");
 122                 pthread_cancel(tid);
 123                 cancelled = true;
 124                 if( !synchronous ) TheList::dbg_del(tid);
 125                 UNLOCK_LOCKS;
 126         }
 127         return 0;
 128 }
 129
 130 int Thread::join()   // join this thread
 131 {
 132         if( !exists() ) return 0;
 133         if( synchronous ) {
 134 // NOTE: this fails if the thread is not synchronous or
 135 //  or another thread is already waiting to join.
 136                 int ret = pthread_join(tid, 0);
 137                 if( ret ) {
 138                         fflush(stdout);
 139                         fprintf(stderr, "Thread %p: %s\n", (void*)tid, strerror(ret));
 140                         fflush(stderr);
 141                 }
 142                 CLEAR_LOCKS_TID(tid);
 143                 TheList::dbg_del(tid);
 144                 tid = ((pthread_t)-1);
 145 // Don't execute anything after this.
 146                 if( autodelete ) delete this;
 147         }
 148         else {
 149 // kludge
 150                 while( running() && !cancelled ) {
 151                         int ret = pthread_kill(tid, 0);
 152                         if( ret ) break;
 153                         usleep(10000);
 154                 }
 155                 tid = ((pthread_t)-1);
 156         }
 157         return 0;
 158 }
 159
 160 int Thread::enable_cancel()
 161 {
 162         if( !cancel_enabled ) {
 163                 cancel_enabled = true;
 164                 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
 165         }
 166         return 0;
 167 }
 168
 169 int Thread::disable_cancel()
 170 {
 171         if( cancel_enabled ) {
 172                 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
 173                 cancel_enabled = false;
 174         }
 175         return 0;
 176 }
 177
 178 int Thread::get_cancel_enabled()
 179 {
 180         return cancel_enabled;
 181 }
 182
 183 void Thread::exit_thread()
 184 {
 185         finished = true;
 186         pthread_exit(0);
 187 }
 188
 189
 190 int Thread::suspend_thread()
 191 {
 192         if( exists() )
 193                 pthread_kill(tid, SIGSTOP);
 194         return 0;
 195 }
 196
 197 int Thread::continue_thread()
 198 {
 199         if( exists() )
 200                 pthread_kill(tid, SIGCONT);
 201         return 0;
 202 }
 203
 204 int Thread::set_synchronous(int value)
 205 {
 206         this->synchronous = value != 0;
 207         return 0;
 208 }
 209
 210 int Thread::set_realtime(int value)
 211 {
 212         this->realtime = value != 0;
 213         return 0;
 214 }
 215
 216 int Thread::set_autodelete(int value)
 217 {
 218         this->autodelete = value != 0;
 219         return 0;
 220 }
 221
 222 int Thread::get_autodelete()
 223 {
 224         return autodelete ? 1 : 0;
 225 }
 226
 227 int Thread::get_synchronous()
 228 {
 229         return synchronous ? 1 : 0;
 230 }
 231
 232 bool Thread::calculate_realtime()
 233 {
 234 //printf("Thread::calculate_realtime %d %d\n", getpid(), sched_getscheduler(0));
 235         return (sched_getscheduler(0) == SCHED_RR ||
 236                 sched_getscheduler(0) == SCHED_FIFO);
 237 }
 238
 239 int Thread::get_realtime()
 240 {
 241         return realtime ? 1 : 0;
 242 }
 243
 244 unsigned long Thread::get_tid()
 245 {
 246         return (unsigned long)tid;
 247 }
 248