4a3620c55a
The prohibition to move libsystemd objects between threads was added in64a7ef8bc0('man: be more explicit about thread safety of sd_journal'). At the time, this was valid, because we were using the mempool for allocation and it apparently didn't handle access from different threads. Sadlly, the commit links to a bugzilla entry referenced in the commit is not publicly visible anymore, so the details are murky. But we stopped using the mempool ina5d8835c78('mempool: only enable mempool use when linked to libsystemd-shared.so'), with subsequent followup inb01f31954f('Turn mempool_enabled() into a weak symbol'). The restriction added in the man page is not necessary since then. The text in the man page was arguably incorrect in calling the code "thread-agnostic". If the code does not support being touched from threads at all and has global state to tied to the main thread, it is not "agnostic", but just doesn't support threads. (I'm looking into https://github.com/systemd/python-systemd/issues/143, and with the current scheme, the python-systemd module and all python code using libsystemd would be very hard to use. With the change to free-threaded python in python3.13, i.e. the replacement of single Global Interpreter Lock by locking on individual objects, this limitation would become even more constraining.)
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