From a175314c3e5827eb193872241446f2f8f5c9d33c Mon Sep 17 00:00:00 2001 From: Daniel Baumann Date: Sat, 4 May 2024 20:07:14 +0200 Subject: Adding upstream version 1:10.5.12. Signed-off-by: Daniel Baumann --- sql/scheduler.h | 97 +++++++++++++++++++++++++++++++++++++++++++++++++++++++++ 1 file changed, 97 insertions(+) create mode 100644 sql/scheduler.h (limited to 'sql/scheduler.h') diff --git a/sql/scheduler.h b/sql/scheduler.h new file mode 100644 index 00000000..ebf8d6e9 --- /dev/null +++ b/sql/scheduler.h @@ -0,0 +1,97 @@ +#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 *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); +}; + + +/** + 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 *arg_connection_count); +void one_thread_scheduler(scheduler_functions *func); + +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 *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 */ -- cgit v1.2.3