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bufferevent-internal.h
1 /*
2 * Copyright (c) 2008-2010 Niels Provos and Nick Mathewson
3 *
4 * Redistribution and use in source and binary forms, with or without
5 * modification, are permitted provided that the following conditions
6 * are met:
7 * 1. Redistributions of source code must retain the above copyright
8 * notice, this list of conditions and the following disclaimer.
9 * 2. Redistributions in binary form must reproduce the above copyright
10 * notice, this list of conditions and the following disclaimer in the
11 * documentation and/or other materials provided with the distribution.
12 * 3. The name of the author may not be used to endorse or promote products
13 * derived from this software without specific prior written permission.
14 *
15 * THIS SOFTWARE IS PROVIDED BY THE AUTHOR ``AS IS'' AND ANY EXPRESS OR
16 * IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE IMPLIED WARRANTIES
17 * OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE ARE DISCLAIMED.
18 * IN NO EVENT SHALL THE AUTHOR BE LIABLE FOR ANY DIRECT, INDIRECT,
19 * INCIDENTAL, SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT
20 * NOT LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
21 * DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
22 * THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
23 * (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF
24 * THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
25 */
26 #ifndef _BUFFEREVENT_INTERNAL_H_
27 #define _BUFFEREVENT_INTERNAL_H_
28
29 #ifdef __cplusplus
30 extern "C" {
31 #endif
32
33 #include "event2/event-config.h"
34 #include "event2/util.h"
35 #include "defer-internal.h"
36 #include "evthread-internal.h"
37 #include "event2/thread.h"
38 #include "ratelim-internal.h"
39 #include "event2/bufferevent_struct.h"
40
41 /* These flags are reasons that we might be declining to actually enable
42 reading or writing on a bufferevent.
43 */
44
45 /* On a all bufferevents, for reading: used when we have read up to the
46 watermark value.
47
48 On a filtering bufferevent, for writing: used when the underlying
49 bufferevent's write buffer has been filled up to its watermark
50 value.
51 */
52 #define BEV_SUSPEND_WM 0x01
53 /* On a base bufferevent: when we have emptied a bandwidth buckets */
54 #define BEV_SUSPEND_BW 0x02
55 /* On a base bufferevent: when we have emptied the group's bandwidth bucket. */
56 #define BEV_SUSPEND_BW_GROUP 0x04
57 /* On a socket bufferevent: can't do any operations while we're waiting for
58 * name lookup to finish. */
59 #define BEV_SUSPEND_LOOKUP 0x08
60 /* On a base bufferevent, for reading: used when a filter has choked this
61 * (underlying) bufferevent because it has stopped reading from it. */
62 #define BEV_SUSPEND_FILT_READ 0x10
63
64 typedef ev_uint16_t bufferevent_suspend_flags;
65
66 struct bufferevent_rate_limit_group {
67 /** List of all members in the group */
68 TAILQ_HEAD(rlim_group_member_list, bufferevent_private) members;
69 /** Current limits for the group. */
70 struct ev_token_bucket rate_limit;
71 struct ev_token_bucket_cfg rate_limit_cfg;
72
73 /** True iff we don't want to read from any member of the group.until
74 * the token bucket refills. */
75 unsigned read_suspended : 1;
76 /** True iff we don't want to write from any member of the group.until
77 * the token bucket refills. */
78 unsigned write_suspended : 1;
79 /** True iff we were unable to suspend one of the bufferevents in the
80 * group for reading the last time we tried, and we should try
81 * again. */
82 unsigned pending_unsuspend_read : 1;
83 /** True iff we were unable to suspend one of the bufferevents in the
84 * group for writing the last time we tried, and we should try
85 * again. */
86 unsigned pending_unsuspend_write : 1;
87
88 /*@{*/
89 /** Total number of bytes read or written in this group since last
90 * reset. */
91 ev_uint64_t total_read;
92 ev_uint64_t total_written;
93 /*@}*/
94
95 /** The number of bufferevents in the group. */
96 int n_members;
97
98 /** The smallest number of bytes that any member of the group should
99 * be limited to read or write at a time. */
100 ev_ssize_t min_share;
101 /** Timeout event that goes off once a tick, when the bucket is ready
102 * to refill. */
103 struct event master_refill_event;
104 /** Lock to protect the members of this group. This lock should nest
105 * within every bufferevent lock: if you are holding this lock, do
106 * not assume you can lock another bufferevent. */
107 void *lock;
108 };
109
110 /** Fields for rate-limiting a single bufferevent. */
111 struct bufferevent_rate_limit {
112 /* Linked-list elements for storing this bufferevent_private in a
113 * group.
114 *
115 * Note that this field is supposed to be protected by the group
116 * lock */
117 TAILQ_ENTRY(bufferevent_private) next_in_group;
118 /** The rate-limiting group for this bufferevent, or NULL if it is
119 * only rate-limited on its own. */
120 struct bufferevent_rate_limit_group *group;
121
122 /* This bufferevent's current limits. */
123 struct ev_token_bucket limit;
124 /* Pointer to the rate-limit configuration for this bufferevent.
125 * Can be shared. XXX reference-count this? */
126 struct ev_token_bucket_cfg *cfg;
127
128 /* Timeout event used when one this bufferevent's buckets are
129 * empty. */
130 struct event refill_bucket_event;
131 };
132
133 /** Parts of the bufferevent structure that are shared among all bufferevent
134 * types, but not exposed in bufferevent_struct.h. */
135 struct bufferevent_private {
136 /** The underlying bufferevent structure. */
137 struct bufferevent bev;
138
139 /** Evbuffer callback to enforce watermarks on input. */
140 struct evbuffer_cb_entry *read_watermarks_cb;
141
142 /** If set, we should free the lock when we free the bufferevent. */
143 unsigned own_lock : 1;
144
145 /** Flag: set if we have deferred callbacks and a read callback is
146 * pending. */
147 unsigned readcb_pending : 1;
148 /** Flag: set if we have deferred callbacks and a write callback is
149 * pending. */
150 unsigned writecb_pending : 1;
151 /** Flag: set if we are currently busy connecting. */
152 unsigned connecting : 1;
153 /** Flag: set if a connect failed prematurely; this is a hack for
154 * getting around the bufferevent abstraction. */
155 unsigned connection_refused : 1;
156 /** Set to the events pending if we have deferred callbacks and
157 * an events callback is pending. */
158 short eventcb_pending;
159
160 /** If set, read is suspended until one or more conditions are over.
161 * The actual value here is a bitfield of those conditions; see the
162 * BEV_SUSPEND_* flags above. */
163 bufferevent_suspend_flags read_suspended;
164
165 /** If set, writing is suspended until one or more conditions are over.
166 * The actual value here is a bitfield of those conditions; see the
167 * BEV_SUSPEND_* flags above. */
168 bufferevent_suspend_flags write_suspended;
169
170 /** Set to the current socket errno if we have deferred callbacks and
171 * an events callback is pending. */
172 int errno_pending;
173
174 /** The DNS error code for bufferevent_socket_connect_hostname */
175 int dns_error;
176
177 /** Used to implement deferred callbacks */
178 struct deferred_cb deferred;
179
180 /** The options this bufferevent was constructed with */
181 enum bufferevent_options options;
182
183 /** Current reference count for this bufferevent. */
184 int refcnt;
185
186 /** Lock for this bufferevent. Shared by the inbuf and the outbuf.
187 * If NULL, locking is disabled. */
188 void *lock;
189
190 /** Rate-limiting information for this bufferevent */
191 struct bufferevent_rate_limit *rate_limiting;
192 };
193
194 /** Possible operations for a control callback. */
195 enum bufferevent_ctrl_op {
196 BEV_CTRL_SET_FD,
197 BEV_CTRL_GET_FD,
198 BEV_CTRL_GET_UNDERLYING
199 };
200
201 /** Possible data types for a control callback */
202 union bufferevent_ctrl_data {
203 void *ptr;
204 evutil_socket_t fd;
205 };
206
207 /**
208 Implementation table for a bufferevent: holds function pointers and other
209 information to make the various bufferevent types work.
210 */
211 struct bufferevent_ops {
212 /** The name of the bufferevent's type. */
213 const char *type;
214 /** At what offset into the implementation type will we find a
215 bufferevent structure?
216
217 Example: if the type is implemented as
218 struct bufferevent_x {
219 int extra_data;
220 struct bufferevent bev;
221 }
222 then mem_offset should be offsetof(struct bufferevent_x, bev)
223 */
224 off_t mem_offset;
225
226 /** Enables one or more of EV_READ|EV_WRITE on a bufferevent. Does
227 not need to adjust the 'enabled' field. Returns 0 on success, -1
228 on failure.
229 */
230 int (*enable)(struct bufferevent *, short);
231
232 /** Disables one or more of EV_READ|EV_WRITE on a bufferevent. Does
233 not need to adjust the 'enabled' field. Returns 0 on success, -1
234 on failure.
235 */
236 int (*disable)(struct bufferevent *, short);
237
238 /** Free any storage and deallocate any extra data or structures used
239 in this implementation.
240 */
241 void (*destruct)(struct bufferevent *);
242
243 /** Called when the timeouts on the bufferevent have changed.*/
244 int (*adj_timeouts)(struct bufferevent *);
245
246 /** Called to flush data. */
247 int (*flush)(struct bufferevent *, short, enum bufferevent_flush_mode);
248
249 /** Called to access miscellaneous fields. */
250 int (*ctrl)(struct bufferevent *, enum bufferevent_ctrl_op, union bufferevent_ctrl_data *);
251
252 };
253
254 extern const struct bufferevent_ops bufferevent_ops_socket;
255 extern const struct bufferevent_ops bufferevent_ops_filter;
256 extern const struct bufferevent_ops bufferevent_ops_pair;
257
258 #define BEV_IS_SOCKET(bevp) ((bevp)->be_ops == &bufferevent_ops_socket)
259 #define BEV_IS_FILTER(bevp) ((bevp)->be_ops == &bufferevent_ops_filter)
260 #define BEV_IS_PAIR(bevp) ((bevp)->be_ops == &bufferevent_ops_pair)
261
262 #ifdef WIN32
263 extern const struct bufferevent_ops bufferevent_ops_async;
264 #define BEV_IS_ASYNC(bevp) ((bevp)->be_ops == &bufferevent_ops_async)
265 #else
266 #define BEV_IS_ASYNC(bevp) 0
267 #endif
268
269 /** Initialize the shared parts of a bufferevent. */
270 int bufferevent_init_common(struct bufferevent_private *, struct event_base *, const struct bufferevent_ops *, enum bufferevent_options options);
271
272 /** For internal use: temporarily stop all reads on bufev, until the conditions
273 * in 'what' are over. */
274 void bufferevent_suspend_read(struct bufferevent *bufev, bufferevent_suspend_flags what);
275 /** For internal use: clear the conditions 'what' on bufev, and re-enable
276 * reading if there are no conditions left. */
277 void bufferevent_unsuspend_read(struct bufferevent *bufev, bufferevent_suspend_flags what);
278
279 /** For internal use: temporarily stop all writes on bufev, until the conditions
280 * in 'what' are over. */
281 void bufferevent_suspend_write(struct bufferevent *bufev, bufferevent_suspend_flags what);
282 /** For internal use: clear the conditions 'what' on bufev, and re-enable
283 * writing if there are no conditions left. */
284 void bufferevent_unsuspend_write(struct bufferevent *bufev, bufferevent_suspend_flags what);
285
286 #define bufferevent_wm_suspend_read(b) \
287 bufferevent_suspend_read((b), BEV_SUSPEND_WM)
288 #define bufferevent_wm_unsuspend_read(b) \
289 bufferevent_unsuspend_read((b), BEV_SUSPEND_WM)
290
291 /*
292 Disable a bufferevent. Equivalent to bufferevent_disable(), but
293 first resets 'connecting' flag to force EV_WRITE down for sure.
294
295 XXXX this method will go away in the future; try not to add new users.
296 See comment in evhttp_connection_reset() for discussion.
297
298 @param bufev the bufferevent to be disabled
299 @param event any combination of EV_READ | EV_WRITE.
300 @return 0 if successful, or -1 if an error occurred
301 @see bufferevent_disable()
302 */
303 int bufferevent_disable_hard(struct bufferevent *bufev, short event);
304
305 /** Internal: Set up locking on a bufferevent. If lock is set, use it.
306 * Otherwise, use a new lock. */
307 int bufferevent_enable_locking(struct bufferevent *bufev, void *lock);
308 /** Internal: Increment the reference count on bufev. */
309 void bufferevent_incref(struct bufferevent *bufev);
310 /** Internal: Lock bufev and increase its reference count.
311 * unlocking it otherwise. */
312 void _bufferevent_incref_and_lock(struct bufferevent *bufev);
313 /** Internal: Decrement the reference count on bufev. Returns 1 if it freed
314 * the bufferevent.*/
315 int bufferevent_decref(struct bufferevent *bufev);
316 /** Internal: Drop the reference count on bufev, freeing as necessary, and
317 * unlocking it otherwise. Returns 1 if it freed the bufferevent. */
318 int _bufferevent_decref_and_unlock(struct bufferevent *bufev);
319
320 /** Internal: If callbacks are deferred and we have a read callback, schedule
321 * a readcb. Otherwise just run the readcb. */
322 void _bufferevent_run_readcb(struct bufferevent *bufev);
323 /** Internal: If callbacks are deferred and we have a write callback, schedule
324 * a writecb. Otherwise just run the writecb. */
325 void _bufferevent_run_writecb(struct bufferevent *bufev);
326 /** Internal: If callbacks are deferred and we have an eventcb, schedule
327 * it to run with events "what". Otherwise just run the eventcb. */
328 void _bufferevent_run_eventcb(struct bufferevent *bufev, short what);
329
330 /** Internal: Add the event 'ev' with timeout tv, unless tv is set to 0, in
331 * which case add ev with no timeout. */
332 int _bufferevent_add_event(struct event *ev, const struct timeval *tv);
333
334 /* =========
335 * These next functions implement timeouts for bufferevents that aren't doing
336 * anything else with ev_read and ev_write, to handle timeouts.
337 * ========= */
338 /** Internal use: Set up the ev_read and ev_write callbacks so that
339 * the other "generic_timeout" functions will work on it. Call this from
340 * the constructor function. */
341 void _bufferevent_init_generic_timeout_cbs(struct bufferevent *bev);
342 /** Internal use: Delete the ev_read and ev_write callbacks if they're pending.
343 * Call this from the destructor function. */
344 int _bufferevent_del_generic_timeout_cbs(struct bufferevent *bev);
345 /** Internal use: Add or delete the generic timeout events as appropriate.
346 * (If an event is enabled and a timeout is set, we add the event. Otherwise
347 * we delete it.) Call this from anything that changes the timeout values,
348 * that enabled EV_READ or EV_WRITE, or that disables EV_READ or EV_WRITE. */
349 int _bufferevent_generic_adj_timeouts(struct bufferevent *bev);
350
351 /** Internal use: We have just successfully read data into an inbuf, so
352 * reset the read timeout (if any). */
353 #define BEV_RESET_GENERIC_READ_TIMEOUT(bev) \
354 do { \
355 if (evutil_timerisset(&(bev)->timeout_read)) \
356 event_add(&(bev)->ev_read, &(bev)->timeout_read); \
357 } while (0)
358 /** Internal use: We have just successfully written data from an inbuf, so
359 * reset the read timeout (if any). */
360 #define BEV_RESET_GENERIC_WRITE_TIMEOUT(bev) \
361 do { \
362 if (evutil_timerisset(&(bev)->timeout_write)) \
363 event_add(&(bev)->ev_write, &(bev)->timeout_write); \
364 } while (0)
365 #define BEV_DEL_GENERIC_READ_TIMEOUT(bev) \
366 event_del(&(bev)->ev_read)
367 #define BEV_DEL_GENERIC_WRITE_TIMEOUT(bev) \
368 event_del(&(bev)->ev_write)
369
370
371 /** Internal: Given a bufferevent, return its corresponding
372 * bufferevent_private. */
373 #define BEV_UPCAST(b) EVUTIL_UPCAST((b), struct bufferevent_private, bev)
374
375 #ifdef _EVENT_DISABLE_THREAD_SUPPORT
376 #define BEV_LOCK(b) _EVUTIL_NIL_STMT
377 #define BEV_UNLOCK(b) _EVUTIL_NIL_STMT
378 #else
379 /** Internal: Grab the lock (if any) on a bufferevent */
380 #define BEV_LOCK(b) do { \
381 struct bufferevent_private *locking = BEV_UPCAST(b); \
382 EVLOCK_LOCK(locking->lock, 0); \
383 } while (0)
384
385 /** Internal: Release the lock (if any) on a bufferevent */
386 #define BEV_UNLOCK(b) do { \
387 struct bufferevent_private *locking = BEV_UPCAST(b); \
388 EVLOCK_UNLOCK(locking->lock, 0); \
389 } while (0)
390 #endif
391
392
393 /* ==== For rate-limiting. */
394
395 int _bufferevent_decrement_write_buckets(struct bufferevent_private *bev,
396 ev_ssize_t bytes);
397 int _bufferevent_decrement_read_buckets(struct bufferevent_private *bev,
398 ev_ssize_t bytes);
399 ev_ssize_t _bufferevent_get_read_max(struct bufferevent_private *bev);
400 ev_ssize_t _bufferevent_get_write_max(struct bufferevent_private *bev);
401
402 #ifdef __cplusplus
403 }
404 #endif
405
406
407 #endif /* _BUFFEREVENT_INTERNAL_H_ */
bufferevent_private::errno_pending
int errno_pending
Set to the current socket errno if we have deferred callbacks and an events callback is pending...
Definition: bufferevent-internal.h:172
bufferevent_ops::enable
int(* enable)(struct bufferevent *, short)
Enables one or more of EV_READ|EV_WRITE on a bufferevent.
Definition: bufferevent-internal.h:230
bufferevent_private::connection_refused
unsigned connection_refused
Flag: set if a connect failed prematurely; this is a hack for getting around the bufferevent abstract...
Definition: bufferevent-internal.h:155
bufferevent_ops::adj_timeouts
int(* adj_timeouts)(struct bufferevent *)
Called when the timeouts on the bufferevent have changed.
Definition: bufferevent-internal.h:244
evbuffer_cb_entry
A single evbuffer callback for an evbuffer.
Definition: evbuffer-internal.h:60
bufferevent_rate_limit_group::min_share
ev_ssize_t min_share
The smallest number of bytes that any member of the group should be limited to read or write at a tim...
Definition: bufferevent-internal.h:100
bufferevent_rate_limit_group::read_suspended
unsigned read_suspended
True iff we don't want to read from any member of the group.until the token bucket refills...
Definition: bufferevent-internal.h:75
bufferevent_private::deferred
struct deferred_cb deferred
Used to implement deferred callbacks.
Definition: bufferevent-internal.h:178
bufferevent_rate_limit_group
Definition: bufferevent-internal.h:66
bufferevent_ops::type
const char * type
The name of the bufferevent's type.
Definition: bufferevent-internal.h:213
bufferevent_private::rate_limiting
struct bufferevent_rate_limit * rate_limiting
Rate-limiting information for this bufferevent.
Definition: bufferevent-internal.h:191
bufferevent_rate_limit_group::pending_unsuspend_write
unsigned pending_unsuspend_write
True iff we were unable to suspend one of the bufferevents in the group for writing the last time we ...
Definition: bufferevent-internal.h:86
bufferevent_private::lock
void * lock
Lock for this bufferevent.
Definition: bufferevent-internal.h:188
event
Structure to represent a single event.
Definition: event_struct.h:87
bufferevent_private::refcnt
int refcnt
Current reference count for this bufferevent.
Definition: bufferevent-internal.h:184
bufferevent_rate_limit_group::total_read
ev_uint64_t total_read
Total number of bytes read or written in this group since last reset.
Definition: bufferevent-internal.h:91
bufferevent_private::connecting
unsigned connecting
Flag: set if we are currently busy connecting.
Definition: bufferevent-internal.h:152
bufferevent_rate_limit_group::master_refill_event
struct event master_refill_event
Timeout event that goes off once a tick, when the bucket is ready to refill.
Definition: bufferevent-internal.h:103
bufferevent_private::own_lock
unsigned own_lock
If set, we should free the lock when we free the bufferevent.
Definition: bufferevent-internal.h:143
bufferevent_struct.h
Data structures for bufferevents.
bufferevent_private::write_suspended
bufferevent_suspend_flags write_suspended
If set, writing is suspended until one or more conditions are over.
Definition: bufferevent-internal.h:168
bufferevent_private::dns_error
int dns_error
The DNS error code for bufferevent_socket_connect_hostname.
Definition: bufferevent-internal.h:175
thread.h
Functions for multi-threaded applications using Libevent.
evutil_socket_t
#define evutil_socket_t
A type wide enough to hold the output of "socket()" or "accept()".
Definition: util.h:278
bufferevent_private::readcb_pending
unsigned readcb_pending
Flag: set if we have deferred callbacks and a read callback is pending.
Definition: bufferevent-internal.h:147
bufferevent_rate_limit_group::n_members
int n_members
The number of bufferevents in the group.
Definition: bufferevent-internal.h:96
bufferevent_private::writecb_pending
unsigned writecb_pending
Flag: set if we have deferred callbacks and a write callback is pending.
Definition: bufferevent-internal.h:150
bufferevent_private
Parts of the bufferevent structure that are shared among all bufferevent types, but not exposed in bu...
Definition: bufferevent-internal.h:135
ev_token_bucket
A token bucket is an internal structure that tracks how many bytes we are currently willing to read o...
Definition: ratelim-internal.h:38
ev_token_bucket_cfg
Configuration info for a token bucket or set of token buckets.
Definition: ratelim-internal.h:48
bufferevent_ops::destruct
void(* destruct)(struct bufferevent *)
Free any storage and deallocate any extra data or structures used in this implementation.
Definition: bufferevent-internal.h:241
bufferevent_rate_limit_group::lock
void * lock
Lock to protect the members of this group.
Definition: bufferevent-internal.h:107
bufferevent_ops::mem_offset
off_t mem_offset
At what offset into the implementation type will we find a bufferevent structure? ...
Definition: bufferevent-internal.h:224
bufferevent_ctrl_data
Possible data types for a control callback.
Definition: bufferevent-internal.h:202
util.h
Common convenience functions for cross-platform portability and related socket manipulations.
bufferevent_private::options
enum bufferevent_options options
The options this bufferevent was constructed with.
Definition: bufferevent-internal.h:181
bufferevent_private::eventcb_pending
short eventcb_pending
Set to the events pending if we have deferred callbacks and an events callback is pending...
Definition: bufferevent-internal.h:158
bufferevent_ops::flush
int(* flush)(struct bufferevent *, short, enum bufferevent_flush_mode)
Called to flush data.
Definition: bufferevent-internal.h:247
bufferevent_rate_limit_group::TAILQ_HEAD
TAILQ_HEAD(rlim_group_member_list, bufferevent_private) members
List of all members in the group.
bufferevent_private::read_suspended
bufferevent_suspend_flags read_suspended
If set, read is suspended until one or more conditions are over.
Definition: bufferevent-internal.h:163
bufferevent_private::read_watermarks_cb
struct evbuffer_cb_entry * read_watermarks_cb
Evbuffer callback to enforce watermarks on input.
Definition: bufferevent-internal.h:140
bufferevent_rate_limit_group::rate_limit
struct ev_token_bucket rate_limit
Current limits for the group.
Definition: bufferevent-internal.h:70
bufferevent_rate_limit::group
struct bufferevent_rate_limit_group * group
The rate-limiting group for this bufferevent, or NULL if it is only rate-limited on its own...
Definition: bufferevent-internal.h:120
deferred_cb
A deferred_cb is a callback that can be scheduled to run as part of an event_base's event_loop...
Definition: defer-internal.h:42
bufferevent_flush_mode
bufferevent_flush_mode
Flags that can be passed into filters to let them know how to deal with the incoming data...
Definition: bufferevent.h:490
bufferevent_rate_limit_group::pending_unsuspend_read
unsigned pending_unsuspend_read
True iff we were unable to suspend one of the bufferevents in the group for reading the last time we ...
Definition: bufferevent-internal.h:82
bufferevent_ops::ctrl
int(* ctrl)(struct bufferevent *, enum bufferevent_ctrl_op, union bufferevent_ctrl_data *)
Called to access miscellaneous fields.
Definition: bufferevent-internal.h:250
bufferevent
Shared implementation of a bufferevent.
Definition: bufferevent_struct.h:70
bufferevent_options
bufferevent_options
Options that can be specified when creating a bufferevent.
Definition: bufferevent.h:148
event_base
Definition: event-internal.h:167
bufferevent_ops
Implementation table for a bufferevent: holds function pointers and other information to make the var...
Definition: bufferevent-internal.h:211
bufferevent_ops::disable
int(* disable)(struct bufferevent *, short)
Disables one or more of EV_READ|EV_WRITE on a bufferevent.
Definition: bufferevent-internal.h:236
bufferevent_private::bev
struct bufferevent bev
The underlying bufferevent structure.
Definition: bufferevent-internal.h:137
bufferevent_rate_limit
Fields for rate-limiting a single bufferevent.
Definition: bufferevent-internal.h:111
bufferevent_rate_limit_group::write_suspended
unsigned write_suspended
True iff we don't want to write from any member of the group.until the token bucket refills...
Definition: bufferevent-internal.h:78