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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.
*/
#include "callback_job.h"
#include <pthread.h>
#include <daemon.h>
#include <utils/mutex.h>
typedef struct private_callback_job_t private_callback_job_t;
/**
* Private data of an callback_job_t Object.
*/
struct private_callback_job_t {
/**
* Public callback_job_t interface.
*/
callback_job_t public;
/**
* Callback to call on execution
*/
callback_job_cb_t callback;
/**
* parameter to supply to callback
*/
void *data;
/**
* cleanup function for data
*/
callback_job_cleanup_t cleanup;
/**
* thread ID of the job, if running
*/
pthread_t thread;
/**
* mutex to access jobs interna
*/
mutex_t *mutex;
/**
* list of asociated child jobs
*/
linked_list_t *children;
/**
* parent of this job, or NULL
*/
private_callback_job_t *parent;
};
/**
* Implements job_t.destroy.
*/
static void destroy(private_callback_job_t *this)
{
if (this->cleanup)
{
this->cleanup(this->data);
}
this->children->destroy(this->children);
this->mutex->destroy(this->mutex);
free(this);
}
/**
* unregister a child from its parent, if any.
*/
static void unregister(private_callback_job_t *this)
{
if (this->parent)
{
iterator_t *iterator;
private_callback_job_t *child;
this->parent->mutex->lock(this->parent->mutex);
iterator = this->parent->children->create_iterator(this->parent->children, TRUE);
while (iterator->iterate(iterator, (void**)&child))
{
if (child == this)
{
iterator->remove(iterator);
break;
}
}
iterator->destroy(iterator);
this->parent->mutex->unlock(this->parent->mutex);
}
}
/**
* Implementation of callback_job_t.cancel.
*/
static void cancel(private_callback_job_t *this)
{
pthread_t thread;
this->mutex->lock(this->mutex);
thread = this->thread;
/* terminate its children */
this->children->invoke_offset(this->children, offsetof(callback_job_t, cancel));
this->mutex->unlock(this->mutex);
/* terminate thread */
if (thread)
{
pthread_cancel(thread);
pthread_join(thread, NULL);
}
/* avoid later execution of a cancelled job */
this->callback = NULL;
}
/**
* Implementation of job_t.execute.
*/
static void execute(private_callback_job_t *this)
{
bool cleanup = FALSE;
this->mutex->lock(this->mutex);
this->thread = pthread_self();
this->mutex->unlock(this->mutex);
pthread_cleanup_push((void*)destroy, this);
while (TRUE)
{
if (this->callback == NULL)
{
cleanup = TRUE;
break;
}
switch (this->callback(this->data))
{
case JOB_REQUEUE_DIRECT:
continue;
case JOB_REQUEUE_FAIR:
{
charon->processor->queue_job(charon->processor,
&this->public.job_interface);
break;
}
case JOB_REQUEUE_NONE:
default:
{
cleanup = TRUE;
break;
}
}
break;
}
this->thread = 0;
unregister(this);
pthread_cleanup_pop(cleanup);
}
/*
* Described in header.
*/
callback_job_t *callback_job_create(callback_job_cb_t cb, void *data,
callback_job_cleanup_t cleanup,
callback_job_t *parent)
{
private_callback_job_t *this = malloc_thing(private_callback_job_t);
/* interface functions */
this->public.job_interface.execute = (void (*) (job_t *)) execute;
this->public.job_interface.destroy = (void (*) (job_t *)) destroy;
this->public.cancel = (void(*)(callback_job_t*))cancel;
/* private variables */
this->mutex = mutex_create(MUTEX_TYPE_DEFAULT);
this->callback = cb;
this->data = data;
this->cleanup = cleanup;
this->thread = 0;
this->children = linked_list_create();
this->parent = (private_callback_job_t*)parent;
/* register us at parent */
if (parent)
{
this->parent->mutex->lock(this->parent->mutex);
this->parent->children->insert_last(this->parent->children, this);
this->parent->mutex->unlock(this->parent->mutex);
}
return &this->public;
}
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