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If pthread_create fails for some reason we need to not access the thread pointer as it will not be valid. Without this check a failed return code from pthread_create would cause a SIGSEGV to occur. An instance that pthread_create could fail is if enough connections were established that we ran out of space in our mapping to create another thread stack. Specifically I have seen this occur with systemd-journal-gatewayd where there was a bug with not releasing connections after they had disconnected. I submitted a fix for that here: https://github.com/systemd/systemd/pull/2287 but it would really be best if libmicrohttpd didn't SIGSEGV under these conditions.