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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).
145 lines
5.1 KiB
C
145 lines
5.1 KiB
C
/*****************************************************************************
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Copyright (c) 1995, 2014, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2015, 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.h
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The wait array used in synchronization primitives
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Created 9/5/1995 Heikki Tuuri
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*******************************************************/
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#ifndef sync0arr_h
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#define sync0arr_h
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#include "univ.i"
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#include "os0thread.h"
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/** Synchronization wait array cell */
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struct sync_cell_t;
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/** Synchronization wait array */
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struct sync_array_t;
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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 found, 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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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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Reserves a wait array cell for waiting for an object.
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The event of the cell is reset to nonsignalled state. */
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sync_cell_t*
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sync_array_reserve_cell(
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sync_array_t* arr, /*!< in: wait array */
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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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/******************************************************************//**
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This function should be called when a thread starts to wait on
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a wait array cell. In the debug version this function checks
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if the wait for a semaphore will result in a deadlock, in which
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case prints info and asserts. */
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void
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sync_array_wait_event(
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sync_array_t* arr, /*!< in: wait array */
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sync_cell_t*& cell); /*!< in: the reserved cell */
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/******************************************************************//**
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Frees the cell. NOTE! sync_array_wait_event frees the cell
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automatically! */
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void
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sync_array_free_cell(
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sync_array_t* arr, /*!< in: wait array */
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sync_cell_t*& cell); /*!< in: the reserved cell */
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/**********************************************************************//**
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Note that one of the wait objects was signalled. */
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void
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sync_array_object_signalled();
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/**********************************************************************//**
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Prints warnings of long semaphore waits to stderr.
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@return TRUE if fatal semaphore wait threshold was exceeded */
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ibool
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sync_array_print_long_waits(
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os_thread_id_t* waiter, /*!< out: longest waiting thread */
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const void** sema); /*!< out: longest-waited-for semaphore */
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/********************************************************************//**
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Validates the integrity of the wait array. Checks
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that the number of reserved cells equals the count variable. */
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void
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sync_array_validate(
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sync_array_t* arr); /*!< in: sync wait array */
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/**********************************************************************//**
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Prints info of the wait array. */
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void
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sync_array_print(
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FILE* file); /*!< in: file where to print */
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/**********************************************************************//**
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Create the primary system wait array(s), they are protected by an OS mutex */
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void
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sync_array_init(
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ulint n_threads); /*!< in: Number of slots to create */
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/**********************************************************************//**
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Close sync array wait sub-system. */
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void
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sync_array_close();
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/**********************************************************************//**
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Get 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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Prints info of the wait array without using any mutexes/semaphores. */
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UNIV_INTERN
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void
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sync_array_print_innodb(void);
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/*****************************************************************//**
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Gets the nth cell in array.
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@return cell */
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UNIV_INTERN
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sync_cell_t*
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sync_array_get_nth_cell(
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/*====================*/
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sync_array_t* arr, /*!< in: sync array */
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ulint n); /*!< in: index */
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#ifndef UNIV_NONINL
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#include "sync0arr.ic"
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#endif /* UNIV_NOINL */
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#endif /* sync0arr_h */
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