[Terisa de morgan]

Originally Posted by kovidgoyal

The safest way to pass data between the calls is to use the filesystem. Create a temporary file, use the file locking in calibre.utils.lock.ExclusiveFile to write to the file from the run() method and read from it in the postadd() method.

Thank you very much, I was trying it to avoid for time response, but it's really the safest way: semaphores.