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89d80c1b0b
Define my_thread_id as an unsigned type, to avoid mismatch with ulonglong. Change some parameters to this type. Use size_t in a few more places. Declare many flag constants as unsigned to avoid sign mismatch when shifting bits or applying the unary ~ operator. When applying the unary ~ operator to enum constants, explictly cast the result to an unsigned type, because enum constants can be treated as signed. In InnoDB, change the source code line number parameters from ulint to unsigned type. Also, make some InnoDB functions return a narrower type (unsigned or uint32_t instead of ulint; bool instead of ibool).
86 lines
2.9 KiB
Text
86 lines
2.9 KiB
Text
/*****************************************************************************
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Copyright (c) 1995, 2015, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2017, MariaDB Corporation.
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This program is free software; you can redistribute it and/or modify it under
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the terms of the GNU General Public License as published by the Free Software
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Foundation; version 2 of the License.
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This program is distributed in the hope that it will be useful, but WITHOUT
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ANY WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS
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FOR A PARTICULAR PURPOSE. See the GNU General Public License for more details.
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You should have received a copy of the GNU General Public License along with
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this program; if not, write to the Free Software Foundation, Inc.,
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51 Franklin Street, Suite 500, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/**************************************************//**
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@file include/sync0arr.ic
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The wait array for synchronization primitives
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Inline code
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Created 9/5/1995 Heikki Tuuri
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*******************************************************/
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extern ulint sync_array_size;
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extern sync_array_t** sync_wait_array;
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#include "ut0counter.h"
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/**********************************************************************//**
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Get an instance of the sync wait array.
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@return an instance of the sync wait array. */
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UNIV_INLINE
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sync_array_t*
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sync_array_get()
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/*============*/
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{
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if (sync_array_size <= 1) {
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return(sync_wait_array[0]);
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}
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return(sync_wait_array[default_indexer_t<>::get_rnd_index()
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% sync_array_size]);
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}
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/******************************************************************//**
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Get an instance of the sync wait array and reserve a wait array cell
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in the instance for waiting for an object. The event of the cell is
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reset to nonsignalled state.
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If reserving cell of the instance fails, try to get another new
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instance until we can reserve an empty cell of it.
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@return the sync array reserved, never NULL. */
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UNIV_INLINE
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sync_array_t*
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sync_array_get_and_reserve_cell(
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/*============================*/
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void* object, /*!< in: pointer to the object to wait for */
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ulint type, /*!< in: lock request type */
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const char* file, /*!< in: file where requested */
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unsigned line, /*!< in: line where requested */
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sync_cell_t** cell) /*!< out: the cell reserved, never NULL */
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{
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sync_array_t* sync_arr = NULL;
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*cell = NULL;
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for (ulint i = 0; i < sync_array_size && *cell == NULL; ++i) {
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/* Although the sync_array is get in a random way currently,
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we still try at most sync_array_size times, in case any
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of the sync_array we get is full */
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sync_arr = sync_array_get();
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*cell = sync_array_reserve_cell(sync_arr, object, type,
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file, line);
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}
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/* This won't be true every time, for the loop above may execute
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more than srv_sync_array_size times to reserve a cell.
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But an assertion here makes the code more solid. */
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ut_a(*cell != NULL);
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return(sync_arr);
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}
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