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+/**
+ * @file event_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 EVENT_QUEUE_H_
+#define EVENT_QUEUE_H_
+
+typedef struct event_queue_t event_queue_t;
+
+#include <sys/time.h>
+
+#include <library.h>
+#include <processing/jobs/job.h>
+
+/**
+ * @brief Event-Queue used to store timed events.
+ *
+ * Added events are sorted. The get method blocks until
+ * the time is elapsed to process the next event. The get
+ * method is called from the scheduler_t thread, which
+ * will add the jobs to to job_queue_t for further processing.
+ *
+ * Although the event-queue is based on a linked_list_t
+ * all access functions are thread-save implemented.
+ *
+ * @b Constructors:
+ * - event_queue_create()
+ *
+ * @ingroup processing
+ */
+struct event_queue_t {
+
+ /**
+ * @brief Returns number of events in queue.
+ *
+ * @param event_queue calling object
+ * @return number of events in queue
+ */
+ int (*get_count) (event_queue_t *event_queue);
+
+ /**
+ * @brief Get the next job from the event-queue.
+ *
+ * If no event is pending, this function blocks until a job can be returned.
+ *
+ * @param event_queue calling object
+ * @param[out] job pointer to a job pointer where to job is returned to
+ * @return next job
+ */
+ job_t *(*get) (event_queue_t *event_queue);
+
+ /**
+ * @brief Adds a event to the queue, using a relative time.
+ *
+ * This function is non blocking and adds a job_t at a specific time to the list.
+ * The specific job object has to get destroyed by the thread which
+ * removes the job.
+ *
+ * @param event_queue calling object
+ * @param[in] job job to add to the queue (job is not copied)
+ * @param[in] time relative time, when the event has to get fired
+ */
+ void (*add_relative) (event_queue_t *event_queue, job_t *job, u_int32_t ms);
+
+ /**
+ * @brief Adds a event to the queue, using an absolute time.
+ *
+ * This function is non blocking and adds a job_t at a specific time to the list.
+ * The specific job object has to get destroyed by the thread which
+ * removes the job.
+ *
+ * @param event_queue calling object
+ * @param[in] job job to add to the queue (job is not copied)
+ * @param[in] time absolute time, when the event has to get fired
+ */
+ void (*add_absolute) (event_queue_t *event_queue, job_t *job, timeval_t time);
+
+ /**
+ * @brief Destroys a event_queue object.
+ *
+ * @warning The caller of this function has to make sure
+ * that no thread is going to add or get an event from the event_queue
+ * after calling this function.
+ *
+ * @param event_queue calling object
+ */
+ void (*destroy) (event_queue_t *event_queue);
+};
+
+/**
+ * @brief Creates an empty event_queue.
+ *
+ * @returns event_queue_t object
+ *
+ * @ingroup processing
+ */
+event_queue_t *event_queue_create(void);
+
+#endif /*EVENT_QUEUE_H_*/