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123 lines
3.3 KiB
C
123 lines
3.3 KiB
C
/** Message paths
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*
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* @file
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* @author Steffen Vogel <stvogel@eonerc.rwth-aachen.de>
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* @copyright 2014-2016, Institute for Automation of Complex Power Systems, EONERC
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* This file is part of VILLASnode. All Rights Reserved. Proprietary and confidential.
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* Unauthorized copying of this file, via any medium is strictly prohibited.
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*/
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/** A path connects one input node to multiple output nodes (1-to-n).
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*
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* @addtogroup path Path
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* @{
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*********************************************************************************/
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#ifndef _PATH_H_
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#define _PATH_H_
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#include <pthread.h>
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#include <libconfig.h>
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#include "list.h"
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#include "config.h"
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#include "hist.h"
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#include "node.h"
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#include "msg.h"
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#include "hooks.h"
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#include "queue.h"
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#include "pool.h"
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#include "stats.h"
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struct path_source
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{
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struct node *node;
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struct pool pool;
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int samplelen;
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pthread_t tid;
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};
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struct path_destination
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{
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struct node *node;
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struct queue queue;
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int queuelen;
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pthread_t tid;
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};
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/** The datastructure for a path. */
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struct path
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{
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enum {
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PATH_INVALID, /**< Path is invalid. */
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PATH_INITIALIZED, /**< Path queues, memory pools & hook system initialized. */
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PATH_RUNNING, /**< Path is currently running. */
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PATH_STOPPED, /**< Path has been stopped. */
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PATH_DESTROYED /**< Path is destroyed. */
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} state; /**< Path state */
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/* Each path has a single source and multiple destinations */
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struct path_source *source; /**< Pointer to the incoming node */
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struct list destinations; /**< List of all outgoing nodes (struct path_destination). */
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struct list hooks; /**< List of function pointers to hooks */
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int enabled; /**< Is this path enabled */
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pthread_t tid; /**< The thread id for this path */
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char *_name; /**< Singleton: A string which is used to print this path to screen. */
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struct stats_delta *stats; /**< Statistic counters. This is a pointer to the statistic hooks private data. */
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config_setting_t *cfg; /**< A pointer to the libconfig object which instantiated this path */
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};
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/** Initialize internal data structures. */
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int path_init(struct path *p);
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/** Destroy path by freeing dynamically allocated memory.
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*
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* @param i A pointer to the path structure.
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*/
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void path_destroy(struct path *p);
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/** Start a path.
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*
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* Start a new pthread for receiving/sending messages over this path.
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*
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* @param p A pointer to the path structure.
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* @retval 0 Success. Everything went well.
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* @retval <0 Error. Something went wrong.
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*/
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int path_start(struct path *p);
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/** Stop a path.
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*
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* @param p A pointer to the path structure.
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* @retval 0 Success. Everything went well.
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* @retval <0 Error. Something went wrong.
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*/
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int path_stop(struct path *p);
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/** Show some basic statistics for a path.
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*
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* @param p A pointer to the path structure.
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*/
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void path_print_stats(struct path *p);
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/** Fills the provided buffer with a string representation of the path.
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*
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* Format: source => [ dest1 dest2 dest3 ]
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*
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* @param p A pointer to the path structure.
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* @return A pointer to a string containing a textual representation of the path.
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*/
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const char * path_name(struct path *p);
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/** Reverse a path */
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int path_reverse(struct path *p, struct path *r);
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/** Check if node is used as source or destination of a path. */
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int path_uses_node(struct path *p, struct node *n);
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#endif /** _PATH_H_ @} */
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