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/**
* @file event_queue.h
*
* @brief Interface of job_queue_t.
*
*/
/*
* Copyright (C) 2005-2006 Martin Willi
* Copyright (C) 2005 Jan Hutter
* Hochschule fuer Technik Rapperswil
*
* 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; either version 2 of the License, or (at your
* option) any later version. See <http://www.fsf.org/copyleft/gpl.txt>.
*
* 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.
*/
#ifndef EVENT_QUEUE_H_
#define EVENT_QUEUE_H_
typedef struct event_queue_t event_queue_t;
#include <sys/time.h>
#include <library.h>
#include <processing/jobs/job.h>
/**
* @brief Event-Queue used to store timed events.
*
* Added events are sorted. The get method blocks until
* the time is elapsed to process the next event. The get
* method is called from the scheduler_t thread, which
* will add the jobs to to job_queue_t for further processing.
*
* Although the event-queue is based on a linked_list_t
* all access functions are thread-save implemented.
*
* @b Constructors:
* - event_queue_create()
*
* @ingroup processing
*/
struct event_queue_t {
/**
* @brief Returns number of events in queue.
*
* @param event_queue calling object
* @return number of events in queue
*/
int (*get_count) (event_queue_t *event_queue);
/**
* @brief Get the next job from the event-queue.
*
* If no event is pending, this function blocks until a job can be returned.
*
* @param event_queue calling object
* @param[out] job pointer to a job pointer where to job is returned to
* @return next job
*/
job_t *(*get) (event_queue_t *event_queue);
/**
* @brief Adds a event to the queue, using a relative time.
*
* This function is non blocking and adds a job_t at a specific time to the list.
* The specific job object has to get destroyed by the thread which
* removes the job.
*
* @param event_queue calling object
* @param[in] job job to add to the queue (job is not copied)
* @param[in] time relative time, when the event has to get fired
*/
void (*add_relative) (event_queue_t *event_queue, job_t *job, u_int32_t ms);
/**
* @brief Adds a event to the queue, using an absolute time.
*
* This function is non blocking and adds a job_t at a specific time to the list.
* The specific job object has to get destroyed by the thread which
* removes the job.
*
* @param event_queue calling object
* @param[in] job job to add to the queue (job is not copied)
* @param[in] time absolute time, when the event has to get fired
*/
void (*add_absolute) (event_queue_t *event_queue, job_t *job, timeval_t time);
/**
* @brief Destroys a event_queue object.
*
* @warning The caller of this function has to make sure
* that no thread is going to add or get an event from the event_queue
* after calling this function.
*
* @param event_queue calling object
*/
void (*destroy) (event_queue_t *event_queue);
};
/**
* @brief Creates an empty event_queue.
*
* @returns event_queue_t object
*
* @ingroup processing
*/
event_queue_t *event_queue_create(void);
#endif /*EVENT_QUEUE_H_*/
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