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Reuse THD for new user connections

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- To ensure that mallocs are marked for the correct THD, even if it's
  allocated in another thread, I added the thread_id to the THD constructor
- Added st_my_thread_var to thr_lock_info_init() to avoid a call to my_thread_var
- Moved things from THD::THD() to THD::init()
- Moved some things to THD::cleanup()
- Added THD::free_connection() and THD::reset_for_reuse()
- Added THD to CONNECT::create_thd()
- Added THD::thread_dbug_id and st_my_thread_var->dbug_id. These are needed
  to ensure that we have a constant thread_id used for debugging with a THD,
  even if it changes thread_id (=connection_id)
- Set variables.pseudo_thread_id in constructor. Removed not needed sets.
This commit is contained in:
Monty
2016-04-07 19:51:40 +03:00
committed by Sergei Golubchik
parent 54f3e18f6e
commit 89685d55d7
34 changed files with 220 additions and 130 deletions
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3
sql/rpl_parallel.cc
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@@ -967,9 +967,8 @@ handle_rpl_parallel_thread(void *arg)
struct rpl_parallel_thread *rpt= (struct rpl_parallel_thread *)arg;
my_thread_init();
thd = new THD;
thd = new THD(next_thread_id());
thd->thread_stack = (char*)&thd;
thd->thread_id= thd->variables.pseudo_thread_id= next_thread_id();
add_to_active_threads(thd);
set_current_thd(thd);
pthread_detach_this_thread();