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118 lines
3.1 KiB
C++
118 lines
3.1 KiB
C++
/*****************************************************************************
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Copyright (c) 2006, 2015, Oracle and/or its affiliates. All Rights Reserved.
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Copyright (c) 2019, 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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#include "ut0list.h"
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#include "mem0mem.h"
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#include "ut0wqueue.h"
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/*******************************************************************//**
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@file ut/ut0wqueue.cc
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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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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(void)
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/*===================*/
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{
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ib_wqueue_t* wq = static_cast<ib_wqueue_t*>(
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ut_malloc_nokey(sizeof(*wq)));
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mysql_mutex_init(0, &wq->mutex, nullptr);
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wq->items = ib_list_create();
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wq->length = 0;
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return(wq);
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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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{
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mysql_mutex_destroy(&wq->mutex);
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ib_list_free(wq->items);
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ut_free(wq);
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}
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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, bool wq_locked)
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{
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if (!wq_locked) {
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mysql_mutex_lock(&wq->mutex);
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}
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ib_list_add_last(wq->items, item, heap);
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wq->length++;
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ut_ad(wq->length == ib_list_len(wq->items));
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if (!wq_locked) {
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mysql_mutex_unlock(&wq->mutex);
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}
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}
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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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{
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ib_list_node_t* node = NULL;
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mysql_mutex_lock(&wq->mutex);
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if(!ib_list_is_empty(wq->items)) {
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node = ib_list_get_first(wq->items);
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if (node) {
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ib_list_remove(wq->items, node);
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--wq->length;
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ut_ad(wq->length == ib_list_len(wq->items));
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}
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}
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mysql_mutex_unlock(&wq->mutex);
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return (node ? node->data : NULL);
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}
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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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mysql_mutex_lock(&wq->mutex);
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bool is_empty = ib_list_is_empty(wq->items);
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mysql_mutex_unlock(&wq->mutex);
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return is_empty;
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}
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