Vladislav Vaintroub 15edd69ddf MDEV-27943 Reduce overhead of attaching THD to OS thread, in threadpool ...

Avoid relatively expensive THD::store_globals() for every query in the
threadpool. Use a lighter version instead, that only resets some thread
local storage variables(THD, mysys, PSI), avoids some calculationms
and caches syscall gettid (Linux only) in a thread_local variable.

Also simplify Worker_context use, with RAII.

2022-10-11 00:08:54 +02:00

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