The test timeouts, because mtr is waiting for pid file.
The pid file is not there, because expected to fail mysqld startup
(duplicate named pipe name), this startup removed pid file of the running
mysqld instance.
To fix, split handle_connections_win() into the initialization part,
and accept/handle part, like it is done elsewhere.
The initialization part runs before pid file handling, and aborts on errors
, thus avoiding pid file overwrites.
Do not try to compile threadpool_common.cc, if threadpool is not available
on current OS.
Also introduced undocumented/uncached CMake variable DISABLE_THREADPOOL,
to emulate builds on exotic OSes.
Remove threads that are doing nothing but wait
- main thread now handles the connections
(if threadpool is used, also threadpool threads would wait for connections)
- thread for socket and pipe connections are removed
- shutdown thread is now removed, we wait for shutdown
notification in main thread as well
- kill_server() is also called inside the main thread, after connection
loop finished.
