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/**
* @file job_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 JOB_QUEUE_H_
#define JOB_QUEUE_H_
typedef struct job_queue_t job_queue_t;
#include <library.h>
#include <processing/jobs/job.h>
/**
* @brief The job queue stores jobs, which will be processed by the thread_pool_t.
*
* Jobs are added from various sources, from the threads and
* from the event_queue_t.
* Although the job-queue is based on a linked_list_t
* all access functions are thread-save implemented.
*
* @b Constructors:
* - job_queue_create()
*
* @ingroup processing
*/
struct job_queue_t {
/**
* @brief Returns number of jobs in queue.
*
* @param job_queue_t calling object
* @returns number of items in queue
*/
int (*get_count) (job_queue_t *job_queue);
/**
* @brief Get the next job from the queue.
*
* If the queue is empty, this function blocks until a job can be returned.
* After using, the returned job has to get destroyed by the caller.
*
* @param job_queue_t calling object
* @param[out] job pointer to a job pointer where to job is returned to
* @return next job
*/
job_t *(*get) (job_queue_t *job_queue);
/**
* @brief Adds a job to the queue.
*
* This function is non blocking and adds a job_t to the list.
* The specific job object has to get destroyed by the thread which
* removes the job.
*
* @param job_queue_t calling object
* @param job job to add to the queue (job is not copied)
*/
void (*add) (job_queue_t *job_queue, job_t *job);
/**
* @brief Destroys a job_queue object.
*
* @warning The caller of this function has to make sure
* that no thread is going to add or get a job from the job_queue
* after calling this function.
*
* @param job_queue_t calling object
*/
void (*destroy) (job_queue_t *job_queue);
};
/**
* @brief Creates an empty job_queue.
*
* @return job_queue_t object
*
* @ingroup processing
*/
job_queue_t *job_queue_create(void);
#endif /*JOB_QUEUE_H_*/
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