mirror of
https://github.com/MariaDB/server.git
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3d4a7390c1
Creating a CONNECT object on client connect and pass this to the working thread which creates the THD. Split LOCK_thread_count to different mutexes Added LOCK_thread_start to syncronize threads Moved most usage of LOCK_thread_count to dedicated functions Use next_thread_id() instead of thread_id++ Other things: - Thread id now starts from 1 instead of 2 - Added cast for thread_id as thread id is now of type my_thread_id - Made THD->host const (To ensure it's not changed) - Removed some DBUG_PRINT() about entering/exiting mutex as these was already logged by mutex code - Fixed that aborted_connects and connection_errors_internal are counted in all cases - Don't take locks for current_linfo when we set it (not needed as it was 0 before)
111 lines
3.4 KiB
C++
111 lines
3.4 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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Copyright (c) 2012, Monty Program 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., 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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#include <my_global.h>
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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, *connection_count;
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ulong *max_connections;
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bool (*init)(void);
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bool (*init_new_connection_thread)(void);
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void (*add_connection)(CONNECT *connect);
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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(scheduler_functions *func,
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ulong *arg_max_connections, uint *arg_connection_count);
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void one_thread_scheduler(scheduler_functions *func);
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extern void scheduler_init();
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extern void post_kill_notification(THD *);
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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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struct 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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};
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#ifdef HAVE_POOL_OF_THREADS
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void pool_of_threads_scheduler(scheduler_functions* func,
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ulong *arg_max_connections,
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uint *arg_connection_count);
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#else
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#define pool_of_threads_scheduler(A,B,C) \
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one_thread_per_connection_scheduler(A, B, C)
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#endif /*HAVE_POOL_OF_THREADS*/
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#endif /* SCHEDULER_INCLUDED */
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