mirror of
https://github.com/MariaDB/server.git
synced 2025-11-04 04:46:15 +01:00
5727d56260
Code structual change only, just limiting super global variables especially when the counter under the THD structure should be used in general.
99 lines
3.1 KiB
C++
99 lines
3.1 KiB
C++
#ifndef SCHEDULER_INCLUDED
|
|
#define SCHEDULER_INCLUDED
|
|
|
|
/* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
|
|
Copyright (c) 2012, Monty Program Ab
|
|
|
|
This program is free software; you can redistribute it and/or modify
|
|
it under the terms of the GNU General Public License as published by
|
|
the Free Software Foundation; version 2 of the License.
|
|
|
|
This program is distributed in the hope that it will be useful,
|
|
but WITHOUT ANY WARRANTY; without even the implied warranty of
|
|
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
|
|
GNU General Public License for more details.
|
|
|
|
You should have received a copy of the GNU General Public License
|
|
along with this program; if not, write to the Free Software
|
|
Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1335 USA */
|
|
|
|
/*
|
|
Classes for the thread scheduler
|
|
*/
|
|
|
|
#ifdef USE_PRAGMA_INTERFACE
|
|
#pragma interface
|
|
#endif
|
|
|
|
class THD;
|
|
|
|
/* Functions used when manipulating threads */
|
|
|
|
struct scheduler_functions
|
|
{
|
|
uint max_threads;
|
|
Atomic_counter<uint> *connection_count;
|
|
ulong *max_connections;
|
|
bool (*init)(void);
|
|
void (*add_connection)(CONNECT *connect);
|
|
void (*thd_wait_begin)(THD *thd, int wait_type);
|
|
void (*thd_wait_end)(THD *thd);
|
|
void (*post_kill_notification)(THD *thd);
|
|
void (*end)(void);
|
|
/** resume previous unfinished command (threadpool only)*/
|
|
void (*thd_resume)(THD* thd);
|
|
};
|
|
|
|
|
|
/**
|
|
Scheduler types enumeration.
|
|
|
|
The default of --thread-handling is the first one in the
|
|
thread_handling_names array, this array has to be consistent with
|
|
the order in this array, so to change default one has to change the
|
|
first entry in this enum and the first entry in the
|
|
thread_handling_names array.
|
|
|
|
@note The last entry of the enumeration is also used to mark the
|
|
thread handling as dynamic. In this case the name of the thread
|
|
handling is fetched from the name of the plugin that implements it.
|
|
*/
|
|
enum scheduler_types
|
|
{
|
|
/*
|
|
The default of --thread-handling is the first one in the
|
|
thread_handling_names array, this array has to be consistent with
|
|
the order in this array, so to change default one has to change
|
|
the first entry in this enum and the first entry in the
|
|
thread_handling_names array.
|
|
*/
|
|
SCHEDULER_ONE_THREAD_PER_CONNECTION=0,
|
|
SCHEDULER_NO_THREADS,
|
|
SCHEDULER_TYPES_COUNT
|
|
};
|
|
|
|
void one_thread_per_connection_scheduler(scheduler_functions *func,
|
|
ulong *arg_max_connections, Atomic_counter<uint> *arg_connection_count);
|
|
void one_thread_scheduler(scheduler_functions *func, Atomic_counter<uint> *arg_connection_count);
|
|
|
|
extern void scheduler_init();
|
|
extern void post_kill_notification(THD *);
|
|
/*
|
|
To be used for pool-of-threads (implemeneted differently on various OSs)
|
|
*/
|
|
struct thd_scheduler
|
|
{
|
|
public:
|
|
void *data; /* scheduler-specific data structure */
|
|
};
|
|
|
|
#ifdef HAVE_POOL_OF_THREADS
|
|
void pool_of_threads_scheduler(scheduler_functions* func,
|
|
ulong *arg_max_connections,
|
|
Atomic_counter<uint> *arg_connection_count);
|
|
#else
|
|
#define pool_of_threads_scheduler(A,B,C) \
|
|
one_thread_per_connection_scheduler(A, B, C)
|
|
#endif /*HAVE_POOL_OF_THREADS*/
|
|
|
|
#endif /* SCHEDULER_INCLUDED */
|