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b1dcf448ea
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.
104 lines
2.7 KiB
C++
104 lines
2.7 KiB
C++
#ifndef SCHEDULER_INCLUDED
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#define SCHEDULER_INCLUDED
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/* Copyright (C) 2007 MySQL AB
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This program is free software; you can redistribute it and/or modify
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it under the terms of the GNU General Public License as published by
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the Free Software Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful,
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but WITHOUT ANY WARRANTY; without even the implied warranty of
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MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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GNU General Public License for more details.
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You should have received a copy of the GNU General Public License
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along with this program; if not, write to the Free Software
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Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA 02111-1307 USA */
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/*
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Classes for the thread scheduler
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*/
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#ifdef USE_PRAGMA_INTERFACE
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#pragma interface
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#endif
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class THD;
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/* Functions used when manipulating threads */
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struct scheduler_functions
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{
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uint max_threads;
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bool (*init)(void);
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bool (*init_new_connection_thread)(void);
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void (*add_connection)(THD *thd);
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void (*thd_wait_begin)(THD *thd, int wait_type);
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void (*thd_wait_end)(THD *thd);
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void (*post_kill_notification)(THD *thd);
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bool (*end_thread)(THD *thd, bool cache_thread);
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void (*end)(void);
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};
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/**
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Scheduler types enumeration.
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The default of --thread-handling is the first one in the
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thread_handling_names array, this array has to be consistent with
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the order in this array, so to change default one has to change the
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first entry in this enum and the first entry in the
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thread_handling_names array.
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@note The last entry of the enumeration is also used to mark the
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thread handling as dynamic. In this case the name of the thread
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handling is fetched from the name of the plugin that implements it.
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*/
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enum scheduler_types
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{
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SCHEDULER_ONE_THREAD_PER_CONNECTION=0,
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SCHEDULER_NO_THREADS,
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SCHEDULER_TYPES_COUNT
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};
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void one_thread_per_connection_scheduler();
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void one_thread_scheduler();
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enum pool_command_op
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{
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NOT_IN_USE_OP= 0, NORMAL_OP= 1, CONNECT_OP, KILL_OP, DIE_OP
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};
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/*
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To be used for pool-of-threads (implemeneted differently on various OSs)
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*/
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class thd_scheduler
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{
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public:
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/*
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Thread instrumentation for the user job.
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This member holds the instrumentation while the user job is not run
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by a thread.
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Note that this member is not conditionally declared
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(ifdef HAVE_PSI_INTERFACE), because doing so will change the binary
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layout of THD, which is exposed to plugin code that may be compiled
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differently.
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*/
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PSI_thread *m_psi;
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void *data; /* scheduler-specific data structure */
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# ifndef DBUG_OFF
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char dbug_explain[512];
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bool set_explain;
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# endif
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thd_scheduler();
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~thd_scheduler();
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};
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extern scheduler_functions *thread_scheduler;
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#endif
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