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/*
* Copyright (C) 2007 Martin Willi
* 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.
*/
/**
* @defgroup callback_job callback_job
* @{ @ingroup jobs
*/
#ifndef CALLBACK_JOB_H_
#define CALLBACK_JOB_H_
typedef struct callback_job_t callback_job_t;
#include <library.h>
#include <processing/jobs/job.h>
typedef enum job_requeue_t job_requeue_t;
/**
* Job requeueing policy
*
* The job requeueing policy defines how a job is handled when the callback
* function returns.
*/
enum job_requeue_t {
/**
* Do not requeue job, destroy it
*/
JOB_REQUEUE_NONE,
/**
* Reque the job fairly, meaning it has to requeue as any other job
*/
JOB_REQUEUE_FAIR,
/**
* Reexecute the job directly, without the need of requeueing it
*/
JOB_REQUEUE_DIRECT,
};
/**
* The callback function to use for the callback job.
*
* This is the function to use as callback for a callback job. It receives
* a parameter supplied to the callback jobs constructor.
*
* @param data param supplied to job
* @return requeing policy how to requeue the job
*/
typedef job_requeue_t (*callback_job_cb_t)(void *data);
/**
* Cleanup function to use for data cleanup.
*
* The callback has an optional user argument which receives data. However,
* this data may be cleaned up if it is allocated. This is the function
* to supply to the constructor.
*
* @param data param supplied to job
* @return requeing policy how to requeue the job
*/
typedef void (*callback_job_cleanup_t)(void *data);
/**
* Class representing an callback Job.
*
* This is a special job which allows a simple callback function to
* be executed by a thread of the thread pool. This allows simple execution
* of asynchronous methods, without to manage threads.
*/
struct callback_job_t {
/**
* The job_t interface.
*/
job_t job_interface;
/**
* Cancel the job's thread and wait for its termination. This only works
* reliably for jobs that always use JOB_REQUEUE_FAIR or JOB_REQUEUE_DIRECT,
* otherwise the job may already be destroyed when cancel is called. */
void (*cancel)(callback_job_t *this);
};
/**
* Creates a callback job.
*
* The cleanup function is called when the job gets destroyed to destroy
* the associated data.
* If parent is not NULL, the specified job gets an association. Whenever
* the parent gets cancelled (or runs out), all of its children are cancelled,
* too.
*
* @param cb callback to call from the processor
* @param data user data to supply to callback
* @param cleanup destructor for data on destruction, or NULL
* @param parent parent of this job
* @return callback_job_t object
*/
callback_job_t *callback_job_create(callback_job_cb_t cb, void *data,
callback_job_cleanup_t cleanup,
callback_job_t *parent);
#endif /** CALLBACK_JOB_H_ @}*/
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