C++ (Cpp) thr_multi_unlock Examples

Example #1

File: thr_lock.c Project: ForcerKing/ShaoqunXu-mysql5.7

enum enum_thr_lock_result
thr_multi_lock(THR_LOCK_DATA **data, uint count, THR_LOCK_INFO *owner,
               ulong lock_wait_timeout, struct st_my_thread_var *thread_var)
{
  THR_LOCK_DATA **pos,**end;
  DBUG_ENTER("thr_multi_lock");
  DBUG_PRINT("lock",("data: 0x%lx  count: %d", (long) data, count));
  if (count > 1)
    sort_locks(data,count);
  /* lock everything */
  for (pos=data,end=data+count; pos < end ; pos++)
  {
    enum enum_thr_lock_result result= thr_lock(*pos, owner, (*pos)->type,
                                               lock_wait_timeout, thread_var);
    if (result != THR_LOCK_SUCCESS)
    {						/* Aborted */
      thr_multi_unlock(data,(uint) (pos-data));
      DBUG_RETURN(result);
    }
    DEBUG_SYNC_C("thr_multi_lock_after_thr_lock");
#ifdef MAIN
    printf("Thread: T@%u  Got lock: 0x%lx  type: %d\n",
           pos[0]->owner->thread_id, (long) pos[0]->lock, pos[0]->type);
    fflush(stdout);
#endif
  }
  thr_lock_merge_status(data, count);
  DBUG_RETURN(THR_LOCK_SUCCESS);
}

Example #2

enum enum_thr_lock_result
thr_multi_lock(THR_LOCK_DATA **data, uint count, THR_LOCK_OWNER *owner)
{
  THR_LOCK_DATA **pos,**end;
  DBUG_ENTER("thr_multi_lock");
  DBUG_PRINT("lock",("data: 0x%lx  count: %d", (long) data, count));
  if (count > 1)
    sort_locks(data,count);
  /* lock everything */
  for (pos=data,end=data+count; pos < end ; pos++)
  {
    enum enum_thr_lock_result result= thr_lock(*pos, owner, (*pos)->type);
    if (result != THR_LOCK_SUCCESS)
    {						/* Aborted */
      thr_multi_unlock(data,(uint) (pos-data));
      DBUG_RETURN(result);
    }
#ifdef MAIN
    printf("Thread: %s  Got lock: 0x%lx  type: %d\n",my_thread_name(),
	   (long) pos[0]->lock, pos[0]->type); fflush(stdout);
#endif
  }
  /*
    Ensure that all get_locks() have the same status
    If we lock the same table multiple times, we must use the same
    status_param!
  */
#if !defined(DONT_USE_RW_LOCKS)
  if (count > 1)
  {
    THR_LOCK_DATA *last_lock= end[-1];
    pos=end-1;
    do
    {
      pos--;
      if (last_lock->lock == (*pos)->lock &&
	  last_lock->lock->copy_status)
      {
	if (last_lock->type <= TL_READ_NO_INSERT)
	{
	  THR_LOCK_DATA **read_lock;
	  /*
	    If we are locking the same table with read locks we must ensure
	    that all tables share the status of the last write lock or
	    the same read lock.
	  */
	  for (;
	       (*pos)->type <= TL_READ_NO_INSERT &&
		 pos != data &&
		 pos[-1]->lock == (*pos)->lock ;
	       pos--) ;

	  read_lock = pos+1;
	  do
	  {
	    (last_lock->lock->copy_status)((*read_lock)->status_param,
					   (*pos)->status_param);
	  } while (*(read_lock++) != last_lock);
	  last_lock= (*pos);			/* Point at last write lock */
	}
	else
	  (*last_lock->lock->copy_status)((*pos)->status_param,
					  last_lock->status_param);
      }
      else
	last_lock=(*pos);
    } while (pos != data);
  }
#endif
  DBUG_RETURN(THR_LOCK_SUCCESS);
}