1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
245
246
247
248
249
250
251
252
253
254
255
256
257
258
259
260
261
|
/*
Unix SMB/CIFS implementation.
common events code for immediate events
Copyright (C) Stefan Metzmacher 2009
** NOTE! The following LGPL license applies to the tevent
** library. This does NOT imply that all of Samba is released
** under the LGPL
This library is free software; you can redistribute it and/or
modify it under the terms of the GNU Lesser General Public
License as published by the Free Software Foundation; either
version 3 of the License, or (at your option) any later version.
This library 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
Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public
License along with this library; if not, see <http://www.gnu.org/licenses/>.
*/
#include "replace.h"
#define TEVENT_DEPRECATED 1
#include "tevent.h"
#include "tevent_internal.h"
#include "tevent_util.h"
static void tevent_common_immediate_cancel(struct tevent_immediate *im)
{
const char *create_location = im->create_location;
bool busy = im->busy;
uint64_t tag = im->tag;
struct tevent_context *detach_ev_ctx = NULL;
if (im->destroyed) {
tevent_abort(im->event_ctx, "tevent_immediate use after free");
return;
}
if (im->detach_ev_ctx != NULL) {
detach_ev_ctx = im->detach_ev_ctx;
im->detach_ev_ctx = NULL;
tevent_trace_immediate_callback(detach_ev_ctx,
im,
TEVENT_EVENT_TRACE_DETACH);
return;
}
if (!im->event_ctx) {
return;
}
if (im->handler_name != NULL) {
TEVENT_DEBUG(im->event_ctx, TEVENT_DEBUG_TRACE,
"Cancel immediate event %p \"%s\"\n",
im, im->handler_name);
}
/* let the backend free im->additional_data */
if (im->cancel_fn) {
im->cancel_fn(im);
}
if (busy && im->handler_name == NULL) {
detach_ev_ctx = im->event_ctx;
} else {
tevent_trace_immediate_callback(im->event_ctx,
im,
TEVENT_EVENT_TRACE_DETACH);
}
DLIST_REMOVE(im->event_ctx->immediate_events, im);
*im = (struct tevent_immediate) {
.create_location = create_location,
.busy = busy,
.tag = tag,
.detach_ev_ctx = detach_ev_ctx,
};
if (!busy) {
talloc_set_destructor(im, NULL);
}
}
/*
destroy an immediate event
*/
static int tevent_common_immediate_destructor(struct tevent_immediate *im)
{
if (im->destroyed) {
tevent_common_check_double_free(im,
"tevent_immediate double free");
goto done;
}
tevent_common_immediate_cancel(im);
im->destroyed = true;
done:
if (im->busy) {
return -1;
}
return 0;
}
/*
* schedule an immediate event on
*/
void tevent_common_schedule_immediate(struct tevent_immediate *im,
struct tevent_context *ev,
tevent_immediate_handler_t handler,
void *private_data,
const char *handler_name,
const char *location)
{
const char *create_location = im->create_location;
bool busy = im->busy;
uint64_t tag = im->tag;
struct tevent_wrapper_glue *glue = im->wrapper;
tevent_common_immediate_cancel(im);
if (!handler) {
return;
}
*im = (struct tevent_immediate) {
.event_ctx = ev,
.wrapper = glue,
.handler = handler,
.private_data = private_data,
.handler_name = handler_name,
.create_location = create_location,
.schedule_location = location,
.busy = busy,
.tag = tag,
};
tevent_trace_immediate_callback(im->event_ctx, im, TEVENT_EVENT_TRACE_ATTACH);
DLIST_ADD_END(ev->immediate_events, im);
talloc_set_destructor(im, tevent_common_immediate_destructor);
TEVENT_DEBUG(ev, TEVENT_DEBUG_TRACE,
"Schedule immediate event \"%s\": %p\n",
handler_name, im);
}
int tevent_common_invoke_immediate_handler(struct tevent_immediate *im,
bool *removed)
{
struct tevent_context *handler_ev = im->event_ctx;
struct tevent_context *ev = im->event_ctx;
struct tevent_immediate cur = *im;
if (removed != NULL) {
*removed = false;
}
TEVENT_DEBUG(ev, TEVENT_DEBUG_TRACE,
"Run immediate event \"%s\": %p\n",
im->handler_name, im);
/*
* remember the handler and then clear the event
* the handler might reschedule the event
*/
im->busy = true;
im->handler_name = NULL;
tevent_common_immediate_cancel(im);
if (cur.wrapper != NULL) {
handler_ev = cur.wrapper->wrap_ev;
tevent_wrapper_push_use_internal(handler_ev, cur.wrapper);
cur.wrapper->ops->before_immediate_handler(
cur.wrapper->wrap_ev,
cur.wrapper->private_state,
cur.wrapper->main_ev,
im,
cur.handler_name,
cur.schedule_location);
}
tevent_trace_immediate_callback(cur.event_ctx, im, TEVENT_EVENT_TRACE_BEFORE_HANDLER);
cur.handler(handler_ev, im, cur.private_data);
if (cur.wrapper != NULL) {
cur.wrapper->ops->after_immediate_handler(
cur.wrapper->wrap_ev,
cur.wrapper->private_state,
cur.wrapper->main_ev,
im,
cur.handler_name,
cur.schedule_location);
tevent_wrapper_pop_use_internal(handler_ev, cur.wrapper);
}
im->busy = false;
/* The event was removed in tevent_common_immediate_cancel(). */
if (im->detach_ev_ctx != NULL) {
struct tevent_context *detach_ev_ctx = im->detach_ev_ctx;
im->detach_ev_ctx = NULL;
tevent_trace_immediate_callback(detach_ev_ctx,
im,
TEVENT_EVENT_TRACE_DETACH);
}
if (im->destroyed) {
talloc_set_destructor(im, NULL);
TALLOC_FREE(im);
if (removed != NULL) {
*removed = true;
}
}
return 0;
}
/*
trigger the first immediate event and return true
if no event was triggered return false
*/
bool tevent_common_loop_immediate(struct tevent_context *ev)
{
struct tevent_immediate *im = ev->immediate_events;
int ret;
if (!im) {
return false;
}
ret = tevent_common_invoke_immediate_handler(im, NULL);
if (ret != 0) {
tevent_abort(ev, "tevent_common_invoke_immediate_handler() failed");
}
return true;
}
void tevent_immediate_set_tag(struct tevent_immediate *im, uint64_t tag)
{
if (im == NULL) {
return;
}
im->tag = tag;
}
uint64_t tevent_immediate_get_tag(const struct tevent_immediate *im)
{
if (im == NULL) {
return 0;
}
return im->tag;
}
|
