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107 lines
3.1 KiB
C++
107 lines
3.1 KiB
C++
#ifndef SCHEDULER_INCLUDED
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#define SCHEDULER_INCLUDED
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/* Copyright (c) 2007, 2011, Oracle and/or its affiliates. All rights reserved.
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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., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 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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/*
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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
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the first entry in this enum and the first entry in the
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thread_handling_names array.
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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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/*
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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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thd_scheduler();
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~thd_scheduler();
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};
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void *thd_get_scheduler_data(THD *thd);
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void thd_set_scheduler_data(THD *thd, void *data);
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PSI_thread* thd_get_psi(THD *thd);
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void thd_set_psi(THD *thd, PSI_thread *psi);
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extern scheduler_functions *thread_scheduler;
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#endif
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