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/*****************************************************************************
Copyright (c) 2006, 2009, Oracle and/or its affiliates. All Rights Reserved.
Copyright (c) 2017, MariaDB Corporation. All Rights Reserved.
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, Suite 500, Boston, MA 02110-1335 USA
*****************************************************************************/
/*******************************************************************//**
@file include/ut0wqueue.h
A work queue
Created 4/26/2006 Osku Salerma
************************************************************************/
/*******************************************************************//**
A Work queue. Threads can add work items to the queue and other threads can
wait for work items to be available and take them off the queue for
processing.
************************************************************************/
#ifndef IB_WORK_QUEUE_H
#define IB_WORK_QUEUE_H
#include "ut0list.h"
#include "mem0mem.h"
#include "os0sync.h"
#include "sync0types.h"
struct ib_wqueue_t;
/****************************************************************//**
Create a new work queue.
@return work queue */
UNIV_INTERN
ib_wqueue_t*
ib_wqueue_create(void);
/*===================*/
/****************************************************************//**
Free a work queue. */
UNIV_INTERN
void
ib_wqueue_free(
/*===========*/
ib_wqueue_t* wq); /*!< in: work queue */
/****************************************************************//**
Add a work item to the queue. */
UNIV_INTERN
void
ib_wqueue_add(
/*==========*/
ib_wqueue_t* wq, /*!< in: work queue */
void* item, /*!< in: work item */
mem_heap_t* heap); /*!< in: memory heap to use for allocating the
list node */
/********************************************************************
Check if queue is empty. */
ibool
ib_wqueue_is_empty(
/*===============*/
/* out: TRUE if queue empty
else FALSE */
const ib_wqueue_t* wq); /* in: work queue */
/****************************************************************//**
Wait for a work item to appear in the queue.
@return work item */
UNIV_INTERN
void*
ib_wqueue_wait(
/*===========*/
ib_wqueue_t* wq); /*!< in: work queue */
/********************************************************************
Wait for a work item to appear in the queue for specified time. */
void*
ib_wqueue_timedwait(
/*================*/
/* out: work item or NULL on timeout*/
ib_wqueue_t* wq, /* in: work queue */
ib_time_t wait_in_usecs); /* in: wait time in micro seconds */
/********************************************************************
Return first item on work queue or NULL if queue is empty
@return work item or NULL */
void*
ib_wqueue_nowait(
/*=============*/
ib_wqueue_t* wq); /*<! in: work queue */
/********************************************************************
Get number of items on queue.
@return number of items on queue */
ulint
ib_wqueue_len(
/*==========*/
ib_wqueue_t* wq); /*<! in: work queue */
/* Work queue. */
struct ib_wqueue_t {
ib_mutex_t mutex; /*!< mutex protecting everything */
ib_list_t* items; /*!< work item list */
os_event_t event; /*!< event we use to signal additions to list;
os_event_set() and os_event_reset() are
protected by ib_wqueue_t::mutex */
};
#endif
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