EVOLUTION-MANAGER

Edit File: srv0conc.h

/***************************************************************************** Copyright (c) 2011, 2014, Oracle and/or its affiliates. All Rights Reserved. Copyright (c) 2018, MariaDB Corporation. Portions of this file contain modifications contributed and copyrighted by Google, Inc. Those modifications are gratefully acknowledged and are described briefly in the InnoDB documentation. The contributions by Google are incorporated with their permission, and subject to the conditions contained in the file COPYING.Google. Portions of this file contain modifications contributed and copyrighted by Percona Inc.. Those modifications are gratefully acknowledged and are described briefly in the InnoDB documentation. The contributions by Percona Inc. are incorporated with their permission, and subject to the conditions contained in the file COPYING.Percona. 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 Street, Suite 500, Boston, MA 02110-1335 USA *****************************************************************************/ /**************************************************//** @file srv/srv0conc.h InnoDB concurrency manager header file Created 2011/04/18 Sunny Bains *******************************************************/ #ifndef srv_conc_h #define srv_conc_h /** We are prepared for a situation that we have this many threads waiting for a semaphore inside InnoDB. srv_start() sets the value. */ extern ulint srv_max_n_threads; /** The following controls how many threads we let inside InnoDB concurrently: threads waiting for locks are not counted into the number because otherwise we could get a deadlock. Value of 0 will disable the concurrency check. */ extern ulong srv_thread_concurrency; struct row_prebuilt_t; /*********************************************************************//** Puts an OS thread to wait if there are too many concurrent threads (>= srv_thread_concurrency) inside InnoDB. The threads wait in a FIFO queue. @param[in,out] prebuilt row prebuilt handler */ void srv_conc_enter_innodb( row_prebuilt_t* prebuilt); /*********************************************************************//** This lets a thread enter InnoDB regardless of the number of threads inside InnoDB. This must be called when a thread ends a lock wait. */ void srv_conc_force_enter_innodb( /*========================*/ trx_t* trx); /*!< in: transaction object associated with the thread */ /*********************************************************************//** This must be called when a thread exits InnoDB in a lock wait or at the end of an SQL statement. */ void srv_conc_force_exit_innodb( /*=======================*/ trx_t* trx); /*!< in: transaction object associated with the thread */ /*********************************************************************//** Get the count of threads waiting inside InnoDB. */ ulint srv_conc_get_waiting_threads(void); /*==============================*/ /*********************************************************************//** Get the count of threads active inside InnoDB. */ ulint srv_conc_get_active_threads(void); /*==============================*/ #endif /* srv_conc_h */