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86 lines
2.7 KiB
C
86 lines
2.7 KiB
C
/*****************************************************************************
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Copyright (c) 2006, 2014, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2017, 2021, 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, Fifth Floor, Boston, MA 02110-1335 USA
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*****************************************************************************/
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/*******************************************************************//**
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@file include/ut0wqueue.h
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A work queue
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Created 4/26/2006 Osku Salerma
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************************************************************************/
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/*******************************************************************//**
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A Work queue. Threads can add work items to the queue and other threads can
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wait for work items to be available and take them off the queue for
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processing.
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************************************************************************/
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#pragma once
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#include "ut0list.h"
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#include "mem0mem.h"
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// Forward declaration
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struct ib_list_t;
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/** Work queue */
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struct ib_wqueue_t
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{
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/** Mutex protecting everything */
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mysql_mutex_t mutex;
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/** Work item list */
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ib_list_t *items;
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/** ib_list_len(*items) */
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size_t length;
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};
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/****************************************************************//**
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Create a new work queue.
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@return work queue */
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ib_wqueue_t*
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ib_wqueue_create();
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/*===============*/
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/****************************************************************//**
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Free a work queue. */
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void
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ib_wqueue_free(
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/*===========*/
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ib_wqueue_t* wq); /*!< in: work queue */
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/** Add a work item to the queue.
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@param[in,out] wq work queue
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@param[in] item work item
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@param[in,out] heap memory heap to use for allocating list node
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@param[in] wq_locked work queue mutex locked */
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void
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ib_wqueue_add(ib_wqueue_t* wq, void* item, mem_heap_t* heap,
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bool wq_locked = false);
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/** Check if queue is empty.
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@param wq wait queue
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@return whether the queue is empty */
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bool ib_wqueue_is_empty(ib_wqueue_t* wq);
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/********************************************************************
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Return first item on work queue or NULL if queue is empty
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@return work item or NULL */
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void*
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ib_wqueue_nowait(
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/*=============*/
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ib_wqueue_t* wq); /*<! in: work queue */
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