54b81cf mysql_socket_accept() microoptimisations

a61baa7 Maintain connection_count atomically

0bee021 Simplified away wake_thread

34dfcbe Move thread re-initialisation out of cache_thread

ebc55c8 Simplified away scheduler_functions::end_thread()

6900aaf Simplified away init_new_connection_thread()

8d9d4aa Signal COND_thread_cache out of mutex

5d183df Try accept a few times before falling back to poll

8777540 Improved ha_close_connection() scalability

5e13943 Adiue thd_ha_data(), you've broke many hearts

ec926b0 Fixed RocksDB to follow THD ha_data protocol

8c8d584 Fixed InnoDB to not use broken thd_ha_data()

5e1b3cc Fixed Aria to follow THD ha_data protocol

ba59cc0 Fixed Sphinx to follow THD ha_data protocol

00e533c Fixed Mroonga to follow THD ha_data protocol

5c18ba6 Fixed Spider to follow THD ha_data protocol

762d2b9 Fixed FederatedX to follow THD ha_data protocol

ce30c99 Moved vio allocation to connection thread

efb61c1 Simplified away CONNECT::real_id

7192d7b Simplified away CONNECT::extra_port

c90c769 Simplified away CONNECT::host

56b1cdd Removed duplicate thread cache check

701e2a7 Optimised fcntl() when accepting connections

218a68b Less shared variables loads under the mutex

8268fa8 Moved set_timespec out of LOCK_thread_cache mutex

ca84758 Cleanup redundant abort_loop checks