slog2info -t argument adds a column in the slog2info output and prints the id of the calling thread.
If this number is 0 for any thread (even for threads with id different to 0) then your are probably using the legacy slog APIs, i.e. [v]slogf, slogi, slogb do not pass the thread-id as part of the log message.
NOTE:
This entry has been validated against the SDP version listed above. Use
caution when considering this advice for any other SDP version. For
supported releases, please reach out to QNX Technical Support if you have any questions/concerns.