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MDEV-6150 Speed up connection speed by moving creation of THD to new thread

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Creating a CONNECT object on client connect and pass this to the working thread which creates the THD.
Split LOCK_thread_count to different mutexes
Added LOCK_thread_start to syncronize threads
Moved most usage of LOCK_thread_count to dedicated functions
Use next_thread_id() instead of thread_id++

Other things:
- Thread id now starts from 1 instead of 2
- Added cast for thread_id as thread id is now of type my_thread_id
- Made THD->host const (To ensure it's not changed)
- Removed some DBUG_PRINT() about entering/exiting mutex as these was already logged by mutex code
- Fixed that aborted_connects and connection_errors_internal are counted in all cases
- Don't take locks for current_linfo when we set it (not needed as it was 0 before)
This commit is contained in:
Monty
2016-02-01 12:45:39 +02:00
parent 076aa182c2
commit 3d4a7390c1
50 changed files with 878 additions and 551 deletions
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2
libmysqld/lib_sql.cc
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@ -664,7 +664,7 @@ void init_embedded_mysql(MYSQL *mysql, int client_flag)
void *create_embedded_thd(int client_flag)
{
THD * thd= new THD;
thd->thread_id= thd->variables.pseudo_thread_id= thread_id++;
thd->thread_id= thd->variables.pseudo_thread_id= next_thread_id();
thd->thread_stack= (char*) &thd;
if (thd->store_globals())