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/*
* Quagga Work Queues.
*
* Copyright (C) 2005 Sun Microsystems, Inc.
*
* This file is part of Quagga.
*
* Quagga 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, or (at your option) any
* later version.
*
* Quagga 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.
*
* You should have received a copy of the GNU General Public License
* along with Quagga; see the file COPYING. If not, write to the Free
* Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA
* 02111-1307, USA.
*/
#ifndef _QUAGGA_WORK_QUEUE_H
#define _QUAGGA_WORK_QUEUE_H
/* Work queue default hold and cycle times - millisec */
#define WORK_QUEUE_DEFAULT_HOLD 50 /* hold-time between runs of a queue */
#define WORK_QUEUE_DEFAULT_DELAY 10 /* minimum delay for queue runs */
#define WORK_QUEUE_DEFAULT_FLOOD 40 /* flood factor, ~2s with prev values */
/* action value, for use by item processor and item error handlers */
typedef enum
{
WQ_SUCCESS = 0,
WQ_ERROR, /* Error, run error handler if provided */
WQ_RETRY_NOW, /* retry immediately */
WQ_RETRY_LATER, /* retry later, cease processing work queue */
WQ_REQUEUE, /* requeue item, continue processing work queue */
WQ_QUEUE_BLOCKED, /* Queue cant be processed at this time.
* Similar to WQ_RETRY_LATER, but doesn't penalise
* the particular item.. */
} wq_item_status;
/* A single work queue item, unsurprisingly */
struct work_queue_item
{
void *data; /* opaque data */
unsigned short ran; /* # of times item has been run */
};
enum work_queue_flags
{
WQ_UNPLUGGED = 0,
WQ_PLUGGED = 1,
};
struct work_queue
{
/* Everything but the specification struct is private
* the following may be read
*/
struct thread_master *master; /* thread master */
struct thread *thread; /* thread, if one is active */
char *name; /* work queue name */
/* Specification for this work queue.
* Public, must be set before use by caller. May be modified at will.
*/
struct {
/* optional opaque user data, global to the queue. */
void *data;
/* work function to process items with:
* First argument is the workqueue queue.
* Second argument is the item data
*/
wq_item_status (*workfunc) (struct work_queue *, void *);
/* error handling function, optional */
void (*errorfunc) (struct work_queue *, struct work_queue_item *);
/* callback to delete user specific item data */
void (*del_item_data) (struct work_queue *, void *);
/* completion callback, called when queue is emptied, optional */
void (*completion_func) (struct work_queue *);
/* max number of retries to make for item that errors */
unsigned int max_retries;
unsigned int hold; /* hold time for first run, in ms */
unsigned int delay; /* min delay between queue runs, in ms */
unsigned int flood; /* number of queue runs after which we consider
* queue to be flooded, where the runs are
* consecutive and each has used its full slot,
* and the queue has still not been cleared. If
* the queue is flooded, then we try harder to
* clear it by ignoring the hold and delay
* times. No point sparing CPU resources just
* to use ever more memory resources.
*/
} spec;
/* remaining fields should be opaque to users */
struct list *items; /* queue item list */
unsigned long runs; /* runs count */
unsigned int runs_since_clear; /* number of runs since queue was
* last cleared
*/
struct {
unsigned int best;
unsigned int granularity;
unsigned long total;
} cycles; /* cycle counts */
/* private state */
enum work_queue_flags flags; /* user set flag */
char status; /* internal status */
#define WQ_STATE_FLOODED (1 << 0)
};
/* User API */
/* create a new work queue, of given name.
* user must fill in the spec of the returned work queue before adding
* anything to it
*/
extern struct work_queue *work_queue_new (struct thread_master *,
const char *);
/* destroy work queue */
extern void work_queue_free (struct work_queue *);
/* Add the supplied data as an item onto the workqueue */
extern void work_queue_add (struct work_queue *, void *);
/* plug the queue, ie prevent it from being drained / processed */
extern void work_queue_plug (struct work_queue *wq);
/* unplug the queue, allow it to be drained again */
extern void work_queue_unplug (struct work_queue *wq);
/* Helpers, exported for thread.c and command.c */
extern int work_queue_run (struct thread *);
extern struct cmd_element show_work_queues_cmd;
#endif /* _QUAGGA_WORK_QUEUE_H */
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