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354d119a | 1 | /* |
2 | * Quagga Work Queues. | |
3 | * | |
4 | * Copyright (C) 2005 Sun Microsystems, Inc. | |
5 | * | |
6 | * This file is part of Quagga. | |
7 | * | |
8 | * Quagga is free software; you can redistribute it and/or modify it | |
9 | * under the terms of the GNU General Public License as published by the | |
10 | * Free Software Foundation; either version 2, or (at your option) any | |
11 | * later version. | |
12 | * | |
13 | * Quagga is distributed in the hope that it will be useful, but | |
14 | * WITHOUT ANY WARRANTY; without even the implied warranty of | |
15 | * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU | |
16 | * General Public License for more details. | |
17 | * | |
18 | * You should have received a copy of the GNU General Public License | |
19 | * along with Quagga; see the file COPYING. If not, write to the Free | |
20 | * Software Foundation, Inc., 59 Temple Place - Suite 330, Boston, MA | |
21 | * 02111-1307, USA. | |
22 | */ | |
23 | ||
24 | #ifndef _QUAGGA_WORK_QUEUE_H | |
25 | #define _QUAGGA_WORK_QUEUE_H | |
26 | ||
306d8890 | 27 | /* Hold time for the initial schedule of a queue run, in millisec */ |
28 | #define WORK_QUEUE_DEFAULT_HOLD 50 | |
354d119a | 29 | |
30 | /* action value, for use by item processor and item error handlers */ | |
31 | typedef enum | |
32 | { | |
33 | WQ_SUCCESS = 0, | |
34 | WQ_ERROR, /* Error, run error handler if provided */ | |
35 | WQ_RETRY_NOW, /* retry immediately */ | |
36 | WQ_RETRY_LATER, /* retry later, cease processing work queue */ | |
269d74fd | 37 | WQ_REQUEUE, /* requeue item, continue processing work queue */ |
38 | WQ_QUEUE_BLOCKED, /* Queue cant be processed at this time. | |
39 | * Similar to WQ_RETRY_LATER, but doesn't penalise | |
40 | * the particular item.. */ | |
354d119a | 41 | } wq_item_status; |
42 | ||
43 | /* A single work queue item, unsurprisingly */ | |
44 | struct work_queue_item | |
45 | { | |
46 | void *data; /* opaque data */ | |
84369684 | 47 | unsigned short ran; /* # of times item has been run */ |
354d119a | 48 | }; |
49 | ||
6ce80bdb | 50 | #define WQ_UNPLUGGED (1 << 0) /* available for draining */ |
269d74fd | 51 | |
354d119a | 52 | struct work_queue |
53 | { | |
889e9311 | 54 | /* Everything but the specification struct is private |
55 | * the following may be read | |
56 | */ | |
354d119a | 57 | struct thread_master *master; /* thread master */ |
58 | struct thread *thread; /* thread, if one is active */ | |
59 | char *name; /* work queue name */ | |
60 | ||
190880dc | 61 | /* Specification for this work queue. |
62 | * Public, must be set before use by caller. May be modified at will. | |
63 | */ | |
354d119a | 64 | struct { |
889e9311 | 65 | /* optional opaque user data, global to the queue. */ |
66 | void *data; | |
67 | ||
68 | /* work function to process items with: | |
69 | * First argument is the workqueue queue. | |
70 | * Second argument is the item data | |
71 | */ | |
72 | wq_item_status (*workfunc) (struct work_queue *, void *); | |
354d119a | 73 | |
74 | /* error handling function, optional */ | |
75 | void (*errorfunc) (struct work_queue *, struct work_queue_item *); | |
76 | ||
77 | /* callback to delete user specific item data */ | |
889e9311 | 78 | void (*del_item_data) (struct work_queue *, void *); |
354d119a | 79 | |
269d74fd | 80 | /* completion callback, called when queue is emptied, optional */ |
81 | void (*completion_func) (struct work_queue *); | |
82 | ||
354d119a | 83 | /* max number of retries to make for item that errors */ |
84 | unsigned int max_retries; | |
85 | ||
86 | unsigned int hold; /* hold time for first run, in ms */ | |
50596be0 DS |
87 | |
88 | unsigned long yield; /* yield time in us for associated thread */ | |
354d119a | 89 | } spec; |
90 | ||
91 | /* remaining fields should be opaque to users */ | |
92 | struct list *items; /* queue item list */ | |
269d74fd | 93 | unsigned long runs; /* runs count */ |
50596be0 | 94 | unsigned long yields; /* yields count */ |
354d119a | 95 | |
96 | struct { | |
97 | unsigned int best; | |
98 | unsigned int granularity; | |
99 | unsigned long total; | |
100 | } cycles; /* cycle counts */ | |
889e9311 | 101 | |
102 | /* private state */ | |
6ce80bdb | 103 | u_int16_t flags; /* user set flag */ |
354d119a | 104 | }; |
105 | ||
106 | /* User API */ | |
269d74fd | 107 | |
108 | /* create a new work queue, of given name. | |
109 | * user must fill in the spec of the returned work queue before adding | |
110 | * anything to it | |
111 | */ | |
8cc4198f | 112 | extern struct work_queue *work_queue_new (struct thread_master *, |
113 | const char *); | |
269d74fd | 114 | /* destroy work queue */ |
8cc4198f | 115 | extern void work_queue_free (struct work_queue *); |
269d74fd | 116 | |
117 | /* Add the supplied data as an item onto the workqueue */ | |
8cc4198f | 118 | extern void work_queue_add (struct work_queue *, void *); |
354d119a | 119 | |
269d74fd | 120 | /* plug the queue, ie prevent it from being drained / processed */ |
121 | extern void work_queue_plug (struct work_queue *wq); | |
122 | /* unplug the queue, allow it to be drained again */ | |
123 | extern void work_queue_unplug (struct work_queue *wq); | |
124 | ||
354d119a | 125 | /* Helpers, exported for thread.c and command.c */ |
8cc4198f | 126 | extern int work_queue_run (struct thread *); |
354d119a | 127 | extern struct cmd_element show_work_queues_cmd; |
128 | #endif /* _QUAGGA_WORK_QUEUE_H */ |