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/**
* @file scheduler.c
*
* @brief implements the scheduler, looks for jobs in event-queue
*
*/
/*
* Copyright (C) 2005 Jan Hutter, 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.
*/
#include <stdlib.h>
#include <pthread.h>
#include "allocator.h"
#include "scheduler.h"
#include "job_queue.h"
#include "globals.h"
/**
* Private data of a scheduler object
*/
typedef struct private_scheduler_s private_scheduler_t;
struct private_scheduler_s {
/**
* Public part of a scheduler object
*/
scheduler_t public;
/**
* Assigned thread to the scheduler_t object
*/
pthread_t assigned_thread;
};
/**
* Thread function started at creation of the scheduler object
*
* @param this assigned scheduler object
* @return SUCCESS if thread_function ended successfully, FAILED otherwise
*/
static void scheduler_thread_function(private_scheduler_t * this)
{
/* cancellation disabled by default */
pthread_setcancelstate(PTHREAD_CANCEL_DISABLE, NULL);
job_t *current_job;
for (;;)
{
/* get a job, this block until one is available */
global_event_queue->get(global_event_queue, ¤t_job);
/* queue the job in the job queue, workers will eat them */
global_job_queue->add(global_job_queue, current_job);
}
}
/**
* Implementation of scheduler_t's destroy function
*/
static status_t destroy(private_scheduler_t *this)
{
pthread_cancel(this->assigned_thread);
pthread_join(this->assigned_thread, NULL);
allocator_free(this);
return SUCCESS;
}
scheduler_t * scheduler_create()
{
private_scheduler_t *this = allocator_alloc_thing(private_scheduler_t);
this->public.destroy = (status_t(*)(scheduler_t*)) destroy;
if (pthread_create(&(this->assigned_thread), NULL, (void*(*)(void*))scheduler_thread_function, this) != 0)
{
/* thread could not be created */
allocator_free(this);
return NULL;
}
return &(this->public);
}
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