The similar check already exists in schedule_post_change().
The function is currently called at two places.
- journal_file_open() in sd-journal:
In this case, if the timer is not set up, then journal_file_post_change()
will be called at the end of journal_file_append_entry(). So, the necessary
task will be done sequentially when an journal entry is stored to the opened
journal file. That is desired when the function is called at outside of the
event loop.
- server_open_journal() in journald:
This is not called after we exit the event loop.
So, we can safely do nothing in the function if the event loop is being
finished or already finished.
Fixes#30644.
Yu Watanabe
5b201ffb1e