Thanks for looking into this! It might be reasonable to do all callback handling in a separate thread pool. It might be more straightforward than trying to validate that the entire client is reentrant. We can solve the recursive lock for this particular instance, but I worry what else might be lurking around. --- Reply to this email directly or view it on GitHub: https://github.com/xrootd/xrootd/issues/257#issuecomment-119987540 ######################################################################## Use REPLY-ALL to reply to list To unsubscribe from the XROOTD-DEV list, click the following link: https://listserv.slac.stanford.edu/cgi-bin/wa?SUBED1=XROOTD-DEV&A=1