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WL#5363: Thread Pool Service Interface

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In order to allow thread schedulers to be dynamically loaded,
it is necessary to make the following changes to the server:

- Two new service interfaces

- Modifications to InnoDB to inform the thread scheduler of state changes.

- Changes to the VIO subsystem for checking if data is available on a socket.

- Elimination of remains of the old thread pool implementation.

The two new service interfaces introduces are:

my_thread_scheduler
  A service interface to register a thread
  scheduler.

thd_wait
  A service interface to inform thread scheduler
  that the thread is about to start waiting.

In addition, the patch adds code that:

- Add a call to thd_wait for table locks in mysys
  thd_lock.c by introducing a set function that
  can be used to set a callback to be used when
  waiting on a lock and resuming from waiting.

- Calling the mysys set function from the server
  to set the callbacks correctly.
This commit is contained in:
Mats Kindahl
2010-06-07 16:01:39 +02:00
parent 0c8c4a7133
commit b1dcf448ea
37 changed files with 647 additions and 129 deletions
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6
sql/sql_show.cc
View File

@ -1789,6 +1789,7 @@ void mysqld_list_processes(THD *thd,const char *user, bool verbose)
if ((thd_info->db=tmp->db)) // Safe test
thd_info->db=thd->strdup(thd_info->db);
thd_info->command=(int) tmp->command;
mysql_mutex_lock(&tmp->LOCK_thd_data);
if ((mysys_var= tmp->mysys_var))
mysql_mutex_lock(&mysys_var->mutex);
thd_info->proc_info= (char*) (tmp->killed == THD::KILL_CONNECTION? "Killed" : 0);
@ -1796,16 +1797,15 @@ void mysqld_list_processes(THD *thd,const char *user, bool verbose)
if (mysys_var)
mysql_mutex_unlock(&mysys_var->mutex);
thd_info->start_time= tmp->start_time;
thd_info->query=0;
/* Lock THD mutex that protects its data when looking at it. */
mysql_mutex_lock(&tmp->LOCK_thd_data);
if (tmp->query())
{
uint length= min(max_query_length, tmp->query_length());
thd_info->query= (char*) thd->strmake(tmp->query(),length);
}
mysql_mutex_unlock(&tmp->LOCK_thd_data);
thd_info->start_time= tmp->start_time;
thread_infos.append(thd_info);
}
}
@ -1892,6 +1892,7 @@ int fill_schema_processlist(THD* thd, TABLE_LIST* tables, COND* cond)
table->field[3]->set_notnull();
}
mysql_mutex_lock(&tmp->LOCK_thd_data);
if ((mysys_var= tmp->mysys_var))
mysql_mutex_lock(&mysys_var->mutex);
/* COMMAND */
@ -1912,6 +1913,7 @@ int fill_schema_processlist(THD* thd, TABLE_LIST* tables, COND* cond)
if (mysys_var)
mysql_mutex_unlock(&mysys_var->mutex);
mysql_mutex_unlock(&tmp->LOCK_thd_data);
/* INFO */
if (tmp->query())