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 #if defined(__TERMUX__)
  32 #include "bthread.h"
  33 #endif
  34
  35
  36 Thread::Thread(int synchronous, int realtime, int autodelete)
  37 {
  38         this->synchronous = synchronous != 0;
  39         this->realtime = realtime != 0;
  40         this->autodelete = autodelete != 0;
  41         tid = (pthread_t)-1;
  42         finished = false;
  43         cancelled = false;
  44         cancel_enabled = false;
  45 }
  46
  47 Thread::~Thread()
  48 {
  49 }
  50
  51 void* Thread::entrypoint(void *parameters)
  52 {
  53         Thread *thread = (Thread*)parameters;
  54
  55 // allow thread to be cancelled at any point during a region where it is enabled.
  56         pthread_setcanceltype(PTHREAD_CANCEL_ASYNCHRONOUS, 0);
  57 // Disable cancellation by default.
  58         pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
  59         thread->cancel_enabled = false;
  60
  61 // Set realtime here since it doesn't work in start
  62         if( thread->realtime && getuid() == 0 ) {
  63                 struct sched_param param = { sched_priority : 1 };
  64                 if(pthread_setschedparam(thread->tid, SCHED_RR, &param) < 0)
  65                         perror("Thread::entrypoint pthread_attr_setschedpolicy");
  66         }
  67
  68         thread->run();
  69         thread->finished = true;
  70         if( !thread->synchronous ) {
  71                 if( thread->autodelete ) delete thread;
  72                 else if( !thread->cancelled ) TheList::dbg_del(thread->tid);
  73                 else thread->tid = ((pthread_t)-1);
  74         }
  75         return NULL;
  76 }
  77
  78 void Thread::start()
  79 {
  80         pthread_attr_t  attr;
  81         struct sched_param param;
  82
  83         pthread_attr_init(&attr);
  84
  85 // previously run, and did not join, join to clean up zombie
  86         if( synchronous && exists() )
  87                 join();
  88
  89         finished = false;
  90         cancelled = false;
  91         owner = get_self();
  92
  93 // Inherit realtime from current thread the easy way.
  94         if( !realtime )
  95                 realtime = calculate_realtime();
  96
  97         if( !synchronous )
  98                 pthread_attr_setdetachstate(&attr, PTHREAD_CREATE_DETACHED);
  99
 100         if( realtime && getuid() == 0 ) {
 101                 if(pthread_attr_setschedpolicy(&attr, SCHED_RR) < 0)
 102                         perror("Thread::start pthread_attr_setschedpolicy");
 103                 param.sched_priority = 50;
 104                 if(pthread_attr_setschedparam(&attr, &param) < 0)
 105                         perror("Thread::start pthread_attr_setschedparam");
 106         }
 107         else {
 108 #if !defined(__TERMUX__)
 109                 if(pthread_attr_setinheritsched(&attr, PTHREAD_INHERIT_SCHED) < 0)
 110                         perror("Thread::start pthread_attr_setinheritsched");
 111 #endif
 112         }
 113
 114 // autodelete may delete this immediately after create
 115         int autodelete = this->autodelete;
 116
 117         pthread_create(&tid, &attr, Thread::entrypoint, this);
 118
 119         if( !autodelete )
 120                 TheList::dbg_add(tid, owner, typeid(*this).name());
 121 }
 122
 123 int Thread::cancel()
 124 {
 125         if( exists() && !cancelled ) {
 126                 LOCK_LOCKS("Thread::cancel");
 127                 pthread_cancel(tid);
 128                 cancelled = true;
 129                 if( !synchronous ) TheList::dbg_del(tid);
 130                 UNLOCK_LOCKS;
 131         }
 132         return 0;
 133 }
 134
 135 int Thread::join()   // join this thread
 136 {
 137         if( !exists() ) return 0;
 138         if( synchronous ) {
 139 // NOTE: this fails if the thread is not synchronous or
 140 //  or another thread is already waiting to join.
 141                 int ret = pthread_join(tid, 0);
 142                 if( ret ) {
 143                         fflush(stdout);
 144                         fprintf(stderr, "Thread %p: %s\n", (void*)tid, strerror(ret));
 145                         fflush(stderr);
 146                 }
 147                 CLEAR_LOCKS_TID(tid);
 148                 TheList::dbg_del(tid);
 149                 tid = ((pthread_t)-1);
 150 // Don't execute anything after this.
 151                 if( autodelete ) delete this;
 152         }
 153         else {
 154 // kludge
 155                 while( running() && !cancelled ) {
 156                         int ret = pthread_kill(tid, 0);
 157                         if( ret ) break;
 158                         usleep(10000);
 159                 }
 160                 tid = ((pthread_t)-1);
 161         }
 162         return 0;
 163 }
 164
 165 int Thread::enable_cancel()
 166 {
 167         if( !cancel_enabled ) {
 168                 cancel_enabled = true;
 169                 pthread_setcancelstate(PTHREAD_CANCEL_ENABLE, NULL);
 170         }
 171         return 0;
 172 }
 173
 174 int Thread::disable_cancel()
 175 {
 176         if( cancel_enabled ) {
 177                 pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
 178                 cancel_enabled = false;
 179         }
 180         return 0;
 181 }
 182
 183 int Thread::get_cancel_enabled()
 184 {
 185         return cancel_enabled;
 186 }
 187
 188 void Thread::exit_thread()
 189 {
 190         finished = true;
 191         pthread_exit(0);
 192 }
 193
 194
 195 int Thread::suspend_thread()
 196 {
 197         if( exists() )
 198                 pthread_kill(tid, SIGSTOP);
 199         return 0;
 200 }
 201
 202 int Thread::continue_thread()
 203 {
 204         if( exists() )
 205                 pthread_kill(tid, SIGCONT);
 206         return 0;
 207 }
 208
 209 int Thread::set_synchronous(int value)
 210 {
 211         this->synchronous = value != 0;
 212         return 0;
 213 }
 214
 215 int Thread::set_realtime(int value)
 216 {
 217         this->realtime = value != 0;
 218         return 0;
 219 }
 220
 221 int Thread::set_autodelete(int value)
 222 {
 223         this->autodelete = value != 0;
 224         return 0;
 225 }
 226
 227 int Thread::get_autodelete()
 228 {
 229         return autodelete ? 1 : 0;
 230 }
 231
 232 int Thread::get_synchronous()
 233 {
 234         return synchronous ? 1 : 0;
 235 }
 236
 237 bool Thread::calculate_realtime()
 238 {
 239 //printf("Thread::calculate_realtime %d %d\n", getpid(), sched_getscheduler(0));
 240         return (sched_getscheduler(0) == SCHED_RR ||
 241                 sched_getscheduler(0) == SCHED_FIFO);
 242 }
 243
 244 int Thread::get_realtime()
 245 {
 246         return realtime ? 1 : 0;
 247 }
 248
 249 unsigned long Thread::get_tid()
 250 {
 251         return (unsigned long)tid;
 252 }
 253