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d62a17ae | 1 | /* |
354d119a | 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 | * | |
896014f4 DL |
18 | * You should have received a copy of the GNU General Public License along |
19 | * with this program; see the file COPYING; if not, write to the Free Software | |
20 | * Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA 02110-1301 USA | |
354d119a | 21 | */ |
22 | ||
23 | #ifndef _QUAGGA_WORK_QUEUE_H | |
24 | #define _QUAGGA_WORK_QUEUE_H | |
25 | ||
4a1ab8e4 | 26 | #include "memory.h" |
f104f6c1 | 27 | #include "queue.h" |
5e244469 RW |
28 | |
29 | #ifdef __cplusplus | |
30 | extern "C" { | |
31 | #endif | |
32 | ||
bf8d3d6a | 33 | DECLARE_MTYPE(WORK_QUEUE); |
4a1ab8e4 | 34 | |
306d8890 | 35 | /* Hold time for the initial schedule of a queue run, in millisec */ |
e208c8f9 | 36 | #define WORK_QUEUE_DEFAULT_HOLD 50 |
354d119a | 37 | |
5418f988 MS |
38 | /* Retry for queue that is 'blocked' or 'retry later' */ |
39 | #define WORK_QUEUE_DEFAULT_RETRY 0 | |
40 | ||
354d119a | 41 | /* action value, for use by item processor and item error handlers */ |
d62a17ae | 42 | typedef enum { |
43 | WQ_SUCCESS = 0, | |
d62a17ae | 44 | WQ_RETRY_NOW, /* retry immediately */ |
45 | WQ_RETRY_LATER, /* retry later, cease processing work queue */ | |
46 | WQ_REQUEUE, /* requeue item, continue processing work queue */ | |
47 | WQ_QUEUE_BLOCKED, /* Queue cant be processed at this time. | |
48 | * Similar to WQ_RETRY_LATER, but doesn't penalise | |
49 | * the particular item.. */ | |
354d119a | 50 | } wq_item_status; |
51 | ||
52 | /* A single work queue item, unsurprisingly */ | |
d62a17ae | 53 | struct work_queue_item { |
f104f6c1 | 54 | STAILQ_ENTRY(work_queue_item) wq; |
d62a17ae | 55 | void *data; /* opaque data */ |
56 | unsigned short ran; /* # of times item has been run */ | |
354d119a | 57 | }; |
58 | ||
6ce80bdb | 59 | #define WQ_UNPLUGGED (1 << 0) /* available for draining */ |
269d74fd | 60 | |
d62a17ae | 61 | struct work_queue { |
62 | /* Everything but the specification struct is private | |
63 | * the following may be read | |
64 | */ | |
65 | struct thread_master *master; /* thread master */ | |
66 | struct thread *thread; /* thread, if one is active */ | |
67 | char *name; /* work queue name */ | |
68 | ||
69 | /* Specification for this work queue. | |
70 | * Public, must be set before use by caller. May be modified at will. | |
71 | */ | |
72 | struct { | |
73 | /* optional opaque user data, global to the queue. */ | |
74 | void *data; | |
75 | ||
76 | /* work function to process items with: | |
77 | * First argument is the workqueue queue. | |
78 | * Second argument is the item data | |
79 | */ | |
80 | wq_item_status (*workfunc)(struct work_queue *, void *); | |
81 | ||
d62a17ae | 82 | /* callback to delete user specific item data */ |
83 | void (*del_item_data)(struct work_queue *, void *); | |
84 | ||
85 | /* completion callback, called when queue is emptied, optional | |
86 | */ | |
87 | void (*completion_func)(struct work_queue *); | |
88 | ||
89 | /* max number of retries to make for item that errors */ | |
90 | unsigned int max_retries; | |
91 | ||
92 | unsigned int hold; /* hold time for first run, in ms */ | |
93 | ||
94 | unsigned long | |
95 | yield; /* yield time in us for associated thread */ | |
5418f988 MS |
96 | |
97 | uint32_t retry; /* Optional retry timeout if queue is blocked */ | |
d62a17ae | 98 | } spec; |
99 | ||
100 | /* remaining fields should be opaque to users */ | |
996c9314 LB |
101 | STAILQ_HEAD(work_queue_items, work_queue_item) |
102 | items; /* queue item list */ | |
103 | int item_count; /* queued items */ | |
d62a17ae | 104 | unsigned long runs; /* runs count */ |
105 | unsigned long yields; /* yields count */ | |
106 | ||
107 | struct { | |
108 | unsigned int best; | |
109 | unsigned int granularity; | |
110 | unsigned long total; | |
111 | } cycles; /* cycle counts */ | |
112 | ||
113 | /* private state */ | |
d7c0a89a | 114 | uint16_t flags; /* user set flag */ |
354d119a | 115 | }; |
116 | ||
117 | /* User API */ | |
269d74fd | 118 | |
f104f6c1 JB |
119 | static inline int work_queue_item_count(struct work_queue *wq) |
120 | { | |
121 | return wq->item_count; | |
122 | } | |
123 | ||
124 | static inline bool work_queue_empty(struct work_queue *wq) | |
125 | { | |
126 | return (wq->item_count == 0) ? true : false; | |
127 | } | |
128 | ||
996c9314 LB |
129 | static inline struct work_queue_item * |
130 | work_queue_last_item(struct work_queue *wq) | |
f104f6c1 JB |
131 | { |
132 | return STAILQ_LAST(&wq->items, work_queue_item, wq); | |
133 | } | |
134 | ||
135 | static inline void work_queue_item_enqueue(struct work_queue *wq, | |
136 | struct work_queue_item *item) | |
137 | { | |
138 | STAILQ_INSERT_TAIL(&wq->items, item, wq); | |
139 | wq->item_count++; | |
140 | } | |
141 | ||
142 | static inline void work_queue_item_dequeue(struct work_queue *wq, | |
143 | struct work_queue_item *item) | |
144 | { | |
145 | assert(wq->item_count > 0); | |
146 | ||
147 | wq->item_count--; | |
148 | STAILQ_REMOVE(&wq->items, item, work_queue_item, wq); | |
149 | } | |
150 | ||
d62a17ae | 151 | /* create a new work queue, of given name. |
269d74fd | 152 | * user must fill in the spec of the returned work queue before adding |
153 | * anything to it | |
154 | */ | |
0b96b828 DS |
155 | extern struct work_queue *work_queue_new(struct thread_master *m, |
156 | const char *queue_name); | |
e208c8f9 | 157 | |
269d74fd | 158 | /* destroy work queue */ |
e208c8f9 DS |
159 | /* |
160 | * The usage of work_queue_free is being transitioned to pass | |
161 | * in the double pointer to remove use after free's. | |
162 | */ | |
49f36252 | 163 | extern void work_queue_free_and_null(struct work_queue **wqp); |
269d74fd | 164 | |
165 | /* Add the supplied data as an item onto the workqueue */ | |
49f36252 | 166 | extern void work_queue_add(struct work_queue *wq, void *item); |
354d119a | 167 | |
269d74fd | 168 | /* plug the queue, ie prevent it from being drained / processed */ |
d62a17ae | 169 | extern void work_queue_plug(struct work_queue *wq); |
269d74fd | 170 | /* unplug the queue, allow it to be drained again */ |
d62a17ae | 171 | extern void work_queue_unplug(struct work_queue *wq); |
269d74fd | 172 | |
0b96b828 | 173 | bool work_queue_is_scheduled(struct work_queue *wq); |
86582682 | 174 | |
354d119a | 175 | /* Helpers, exported for thread.c and command.c */ |
0b96b828 | 176 | extern void work_queue_run(struct thread *thread); |
0b84f294 | 177 | |
d62a17ae | 178 | extern void workqueue_cmd_init(void); |
0b84f294 | 179 | |
5e244469 RW |
180 | #ifdef __cplusplus |
181 | } | |
182 | #endif | |
183 | ||
354d119a | 184 | #endif /* _QUAGGA_WORK_QUEUE_H */ |