C++ DEVICE::set_blocked方法代码示例

/*
 * Wait for SysOp to mount a tape on a specific device
 *
 *   Returns: W_ERROR, W_TIMEOUT, W_POLL, W_MOUNT, or W_WAKE
 */
int wait_for_sysop(DCR *dcr)
{
   struct timeval tv;
   struct timezone tz;
   struct timespec timeout;
   time_t last_heartbeat = 0;
   time_t first_start = time(NULL);
   int status = 0;
   int add_wait;
   bool unmounted;
   DEVICE *dev = dcr->dev;
   JCR *jcr = dcr->jcr;

   dev->Lock();
   Dmsg1(dbglvl, "Enter blocked=%s\n", dev->print_blocked());

   /*
    * Since we want to mount a tape, make sure current one is
    *  not marked as using this drive.
    */
   volume_unused(dcr);

   unmounted = dev->is_device_unmounted();
   dev->poll = false;
   /*
    * Wait requested time (dev->rem_wait_sec).  However, we also wake up every
    *    HB_TIME seconds and send a heartbeat to the FD and the Director
    *    to keep stateful firewalls from closing them down while waiting
    *    for the operator.
    */
   add_wait = dev->rem_wait_sec;
   if (me->heartbeat_interval && add_wait > me->heartbeat_interval) {
      add_wait = me->heartbeat_interval;
   }
   /* If the user did not unmount the tape and we are polling, ensure
    *  that we poll at the correct interval.
    */
   if (!unmounted && dev->vol_poll_interval && add_wait > dev->vol_poll_interval) {
      add_wait = dev->vol_poll_interval;
   }

   if (!unmounted) {
      Dmsg1(dbglvl, "blocked=%s\n", dev->print_blocked());
      dev->dev_prev_blocked = dev->blocked();
      dev->set_blocked(BST_WAITING_FOR_SYSOP); /* indicate waiting for mount */
   }

   for ( ; !job_canceled(jcr); ) {
      time_t now, start, total_waited;

      gettimeofday(&tv, &tz);
      timeout.tv_nsec = tv.tv_usec * 1000;
      timeout.tv_sec = tv.tv_sec + add_wait;

      Dmsg4(dbglvl, "I'm going to sleep on device %s. HB=%d rem_wait=%d add_wait=%d\n",
         dev->print_name(), (int)me->heartbeat_interval, dev->rem_wait_sec, add_wait);
      start = time(NULL);

      /* Wait required time */
      status = pthread_cond_timedwait(&dev->wait_next_vol, &dev->m_mutex, &timeout);

      Dmsg2(dbglvl, "Wokeup from sleep on device status=%d blocked=%s\n", status,
         dev->print_blocked());
      now = time(NULL);
      total_waited = now - first_start;
      dev->rem_wait_sec -= (now - start);

      /* Note, this always triggers the first time. We want that. */
      if (me->heartbeat_interval) {
         if (now - last_heartbeat >= me->heartbeat_interval) {
            /* send heartbeats */
            if (jcr->file_bsock) {
               jcr->file_bsock->signal(BNET_HEARTBEAT);
               Dmsg0(dbglvl, "Send heartbeat to FD.\n");
            }
            if (jcr->dir_bsock) {
               jcr->dir_bsock->signal(BNET_HEARTBEAT);
            }
            last_heartbeat = now;
         }
      }

      if (status == EINVAL) {
         berrno be;
         Jmsg1(jcr, M_FATAL, 0, _("pthread timedwait error. ERR=%s\n"), be.bstrerror(status));
         status = W_ERROR;             /* error */
         break;
      }

      /*
       * Continue waiting if operator is labeling volumes
       */
      if (dev->blocked() == BST_WRITING_LABEL) {
         continue;
      }
//.........这里部分代码省略.........

/*
 * This job is done, so release the device. From a Unix standpoint,
 *  the device remains open.
 *
 * Note, if we were spooling, we may enter with the device blocked.
 *   We unblock at the end, only if it was us who blocked the
 *   device.
 *
 */
bool release_device(DCR *dcr)
{
   utime_t now;
   JCR *jcr = dcr->jcr;
   DEVICE *dev = dcr->dev;
   bool ok = true;
   char tbuf[100];
   int was_blocked = BST_NOT_BLOCKED;

   /*
    * Capture job statistics now that we are done using this device.
    */
   now = (utime_t)time(NULL);
   update_job_statistics(jcr, now);

   dev->Lock();
   if (!dev->is_blocked()) {
      block_device(dev, BST_RELEASING);
   } else {
      was_blocked = dev->blocked();
      dev->set_blocked(BST_RELEASING);
   }
   lock_volumes();
   Dmsg2(100, "release_device device %s is %s\n", dev->print_name(), dev->is_tape() ? "tape" : "disk");

   /*
    * If device is reserved, job never started, so release the reserve here
    */
   dcr->clear_reserved();

   if (dev->can_read()) {
      VOLUME_CAT_INFO *vol = &dev->VolCatInfo;
      dev->clear_read();              /* clear read bit */
      Dmsg2(150, "dir_update_vol_info. label=%d Vol=%s\n",
         dev->is_labeled(), vol->VolCatName);
      if (dev->is_labeled() && vol->VolCatName[0] != 0) {
         dcr->dir_update_volume_info(false, false); /* send Volume info to Director */
         remove_read_volume(jcr, dcr->VolumeName);
         volume_unused(dcr);
      }
   } else if (dev->num_writers > 0) {
      /*
       * Note if WEOT is set, we are at the end of the tape and may not be positioned correctly,
       * so the job_media_record and update_vol_info have already been done,
       * which means we skip them here.
       */
      dev->num_writers--;
      Dmsg1(100, "There are %d writers in release_device\n", dev->num_writers);
      if (dev->is_labeled()) {
         Dmsg2(200, "dir_create_jobmedia. Release vol=%s dev=%s\n",
               dev->getVolCatName(), dev->print_name());
         if (!dev->at_weot() && !dcr->dir_create_jobmedia_record(false)) {
            Jmsg2(jcr, M_FATAL, 0, _("Could not create JobMedia record for Volume=\"%s\" Job=%s\n"),
               dcr->getVolCatName(), jcr->Job);
         }

         /*
          * If no more writers, and no errors, and wrote something, write an EOF
          */
         if (!dev->num_writers && dev->can_write() && dev->block_num > 0) {
            dev->weof(1);
            write_ansi_ibm_labels(dcr, ANSI_EOF_LABEL, dev->VolHdr.VolumeName);
         }
         if (!dev->at_weot()) {
            dev->VolCatInfo.VolCatFiles = dev->file;   /* set number of files */

            /*
             * Note! do volume update before close, which zaps VolCatInfo
             */
            dcr->dir_update_volume_info(false, false); /* send Volume info to Director */
            Dmsg2(200, "dir_update_vol_info. Release vol=%s dev=%s\n",
                  dev->getVolCatName(), dev->print_name());
         }
         if (dev->num_writers == 0) {         /* if not being used */
            volume_unused(dcr);               /*  we obviously are not using the volume */
         }
      }

   } else {
      /*
       * If we reach here, it is most likely because the job has failed,
       * since the device is not in read mode and there are no writers.
       * It was probably reserved.
       */
      volume_unused(dcr);
   }

   Dmsg3(100, "%d writers, %d reserve, dev=%s\n", dev->num_writers, dev->num_reserved(), dev->print_name());

   /*
    * If no writers, close if file or !CAP_ALWAYS_OPEN
//.........这里部分代码省略.........