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/*****************************************************************************
Copyright (c) 1995, 2016, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2015, 2017, MariaDB Corporation.
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, Fifth Floor, Boston, MA 02110-1335 USA
*****************************************************************************/
/**************************************************//**
@file include/sync0arr.h
The wait array used in synchronization primitives
Created 9/5/1995 Heikki Tuuri
*******************************************************/
#ifndef sync0arr_h
#define sync0arr_h
#include "univ.i"
/** Synchronization wait array cell */
struct sync_cell_t;
/** Synchronization wait array */
struct sync_array_t;
/******************************************************************//**
Get an instance of the sync wait array and reserve a wait array cell
in the instance for waiting for an object. The event of the cell is
reset to nonsignalled state.
If reserving cell of the instance fails, try to get another new
instance until we can reserve an empty cell of it.
@return the sync array found, never NULL. */
UNIV_INLINE
sync_array_t*
sync_array_get_and_reserve_cell(
void* object, /*!< in: pointer to the object to wait for */
ulint type, /*!< in: lock request type */
const char* file, /*!< in: file where requested */
unsigned line, /*!< in: line where requested */
sync_cell_t** cell); /*!< out: the cell reserved, never NULL */
/******************************************************************//**
Reserves a wait array cell for waiting for an object.
The event of the cell is reset to nonsignalled state. */
sync_cell_t*
sync_array_reserve_cell(
sync_array_t* arr, /*!< in: wait array */
void* object, /*!< in: pointer to the object to wait for */
ulint type, /*!< in: lock request type */
const char* file, /*!< in: file where requested */
unsigned line); /*!< in: line where requested */
/******************************************************************//**
This function should be called when a thread starts to wait on
a wait array cell. In the debug version this function checks
if the wait for a semaphore will result in a deadlock, in which
case prints info and asserts. */
void
sync_array_wait_event(
sync_array_t* arr, /*!< in: wait array */
sync_cell_t*& cell); /*!< in: the reserved cell */
/******************************************************************//**
Frees the cell. NOTE! sync_array_wait_event frees the cell
automatically! */
void
sync_array_free_cell(
sync_array_t* arr, /*!< in: wait array */
sync_cell_t*& cell); /*!< in: the reserved cell */
/**********************************************************************//**
Note that one of the wait objects was signalled. */
void
sync_array_object_signalled();
/**********************************************************************//**
Prints warnings of long semaphore waits to stderr.
@return TRUE if fatal semaphore wait threshold was exceeded */
ibool
sync_array_print_long_waits(
os_thread_id_t* waiter, /*!< out: longest waiting thread */
const void** sema); /*!< out: longest-waited-for semaphore */
/**********************************************************************//**
Prints info of the wait array. */
void
sync_array_print(
FILE* file); /*!< in: file where to print */
/**********************************************************************//**
Create the primary system wait array(s), they are protected by an OS mutex */
void
sync_array_init(
ulint n_threads); /*!< in: Number of slots to create */
/**********************************************************************//**
Close sync array wait sub-system. */
void
sync_array_close();
/**********************************************************************//**
Get an instance of the sync wait array. */
UNIV_INLINE
sync_array_t*
sync_array_get();
/**********************************************************************//**
Prints info of the wait array without using any mutexes/semaphores. */
UNIV_INTERN
void
sync_array_print_innodb(void);
/*****************************************************************//**
Gets the nth cell in array.
@return cell */
UNIV_INTERN
sync_cell_t*
sync_array_get_nth_cell(
/*====================*/
sync_array_t* arr, /*!< in: sync array */
ulint n); /*!< in: index */
#include "sync0arr.ic"
#endif /* sync0arr_h */
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