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
262
263
264
265
266
267
|
/*
* Copyright (C) Igor Sysoev
* Copyright (C) NGINX, Inc.
*/
#include <nxt_main.h>
static void *nxt_thread_trampoline(void *data);
static void nxt_thread_time_cleanup(void *data);
#if (NXT_HAVE_PTHREAD_SPECIFIC_DATA)
static void nxt_thread_key_dtor(void *data);
void
nxt_thread_init_data(nxt_thread_specific_data_t tsd)
{
void *p;
nxt_err_t err;
pthread_key_t key;
while ((nxt_atomic_int_t) tsd->key < 0) {
/*
* Atomic allocation of a key number.
* -1 means an uninitialized key,
* -2 is the initializing lock to assure the single value for the key.
*/
if (nxt_atomic_cmp_set(&tsd->key, -1, -2)) {
err = pthread_key_create(&key, nxt_thread_key_dtor);
if (err != 0) {
nxt_main_log_alert("pthread_key_create() failed %E", err);
goto fail;
}
tsd->key = (nxt_atomic_t) key;
nxt_main_log_debug("pthread_key_create(): %A", tsd->key);
}
}
if (pthread_getspecific((pthread_key_t) tsd->key) != NULL) {
return;
}
p = nxt_zalloc(tsd->size);
if (p == NULL) {
goto fail;
}
err = pthread_setspecific((pthread_key_t) tsd->key, p);
if (err == 0) {
return;
}
nxt_main_log_alert("pthread_setspecific(%A) failed %E", tsd->key, err);
fail:
pthread_exit(NULL);
nxt_unreachable();
}
static void
nxt_thread_key_dtor(void *data)
{
nxt_main_log_debug("pthread key dtor: %p", data);
nxt_free(data);
}
#endif
nxt_int_t
nxt_thread_create(nxt_thread_handle_t *handle, nxt_thread_link_t *link)
{
nxt_err_t err;
err = pthread_create(handle, NULL, nxt_thread_trampoline, link);
if (nxt_fast_path(err == 0)) {
nxt_thread_log_debug("pthread_create(): %PH", *handle);
return NXT_OK;
}
nxt_thread_log_alert("pthread_create() failed %E", err);
nxt_free(link);
return NXT_ERROR;
}
static void *
nxt_thread_trampoline(void *data)
{
nxt_thread_t *thr;
nxt_thread_link_t *link;
nxt_thread_start_t start;
link = data;
thr = nxt_thread_init();
nxt_log_debug(thr->log, "thread trampoline: %PH", thr->handle);
pthread_cleanup_push(nxt_thread_time_cleanup, thr);
start = link->start;
data = link->work.data;
if (link->work.handler != NULL) {
thr->link = link;
} else {
nxt_free(link);
}
start(data);
/*
* nxt_thread_time_cleanup() should be called only if a thread
* would be canceled, so ignore it here because nxt_thread_exit()
* calls nxt_thread_time_free() as well.
*/
pthread_cleanup_pop(0);
nxt_thread_exit(thr);
nxt_unreachable();
return NULL;
}
nxt_thread_t *
nxt_thread_init(void)
{
nxt_thread_t *thr;
nxt_thread_init_data(nxt_thread_context);
thr = nxt_thread();
if (thr->log == NULL) {
thr->log = &nxt_main_log;
thr->handle = nxt_thread_handle();
/*
* Threads are never preempted by asynchronous signals, since
* the signals are processed synchronously by dedicated thread.
*/
thr->time.signal = -1;
nxt_thread_time_update(thr);
}
nxt_random_init(&thr->random);
return thr;
}
static void
nxt_thread_time_cleanup(void *data)
{
nxt_thread_t *thr;
thr = data;
nxt_log_debug(thr->log, "thread time cleanup");
nxt_thread_time_free(thr);
}
void
nxt_thread_exit(nxt_thread_t *thr)
{
nxt_thread_link_t *link;
nxt_event_engine_t *engine;
nxt_log_debug(thr->log, "thread exit");
link = thr->link;
thr->link = NULL;
if (link != NULL) {
/*
* link->work.handler is already set to an exit handler,
* and link->work.task is already set to the correct engine->task.
* The link should be freed by the exit handler.
*/
link->work.obj = (void *) (uintptr_t) thr->handle;
engine = nxt_container_of(link->work.task, nxt_event_engine_t, task);
nxt_event_engine_post(engine, &link->work);
}
nxt_thread_time_free(thr);
pthread_exit(NULL);
nxt_unreachable();
}
void
nxt_thread_cancel(nxt_thread_handle_t handle)
{
nxt_err_t err;
nxt_thread_log_debug("thread cancel: %PH", handle);
err = pthread_cancel(handle);
if (err != 0) {
nxt_main_log_alert("pthread_cancel(%PH) failed %E", handle, err);
}
}
void
nxt_thread_wait(nxt_thread_handle_t handle)
{
nxt_err_t err;
nxt_thread_log_debug("thread wait: %PH", handle);
err = pthread_join(handle, NULL);
if (err != 0) {
nxt_main_log_alert("pthread_join(%PH) failed %E", handle, err);
}
}
nxt_tid_t
nxt_thread_tid(nxt_thread_t *thr)
{
#if (NXT_HAVE_THREAD_STORAGE_CLASS)
if (nxt_slow_path(thr->tid == 0)) {
thr->tid = nxt_thread_get_tid();
}
return thr->tid;
#else
if (nxt_fast_path(thr != NULL)) {
if (nxt_slow_path(thr->tid == 0)) {
thr->tid = nxt_thread_get_tid();
}
return thr->tid;
}
return nxt_thread_get_tid();
#endif
}
|
