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#ifndef SCHEDULER_INCLUDED
#define SCHEDULER_INCLUDED
/* Copyright (C) 2007 MySQL 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., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
/*
Classes for the thread scheduler
*/
#ifdef USE_PRAGMA_INTERFACE
#pragma interface
#endif
#include <my_global.h>
class THD;
/* Functions used when manipulating threads */
struct scheduler_functions
{
uint max_threads, *connection_count;
ulong *max_connections;
bool (*init)(void);
bool (*init_new_connection_thread)(void);
void (*add_connection)(THD *thd);
void (*thd_wait_begin)(THD *thd, int wait_type);
void (*thd_wait_end)(THD *thd);
void (*post_kill_notification)(THD *thd);
bool (*end_thread)(THD *thd, bool cache_thread);
void (*end)(void);
};
/**
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, uint *arg_connection_count);
void one_thread_scheduler(scheduler_functions *func);
#if defined(HAVE_LIBEVENT) && !defined(EMBEDDED_LIBRARY)
#define HAVE_POOL_OF_THREADS 1
struct event;
class thd_scheduler
{
public:
/*
Thread instrumentation for the user job.
This member holds the instrumentation while the user job is not run
by a thread.
Note that this member is not conditionally declared
(ifdef HAVE_PSI_INTERFACE), because doing so will change the binary
layout of THD, which is exposed to plugin code that may be compiled
differently.
*/
PSI_thread *m_psi;
bool logged_in;
struct event* io_event;
LIST list;
bool thread_attached; /* Indicates if THD is attached to the OS thread */
thd_scheduler();
~thd_scheduler();
bool init(THD* parent_thd);
bool thread_attach();
void thread_detach();
};
void pool_of_threads_scheduler(scheduler_functions* func);
#else
#define pool_of_threads_scheduler(A) \
one_thread_per_connection_scheduler(A, &max_connections, \
&connection_count)
class thd_scheduler
{};
#endif
#endif
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