3 * Copyright (C) Igor Sysoev
7 #include <ngx_config.h>
13 static ngx_int_t
ngx_select_init(ngx_cycle_t
*cycle
, ngx_msec_t timer
);
14 static void ngx_select_done(ngx_cycle_t
*cycle
);
15 static ngx_int_t
ngx_select_add_event(ngx_event_t
*ev
, ngx_int_t event
,
17 static ngx_int_t
ngx_select_del_event(ngx_event_t
*ev
, ngx_int_t event
,
19 static ngx_int_t
ngx_select_process_events(ngx_cycle_t
*cycle
, ngx_msec_t timer
,
21 static char *ngx_select_init_conf(ngx_cycle_t
*cycle
, void *conf
);
24 static fd_set master_read_fd_set
;
25 static fd_set master_write_fd_set
;
26 static fd_set work_read_fd_set
;
27 static fd_set work_write_fd_set
;
30 static ngx_uint_t max_read
;
31 static ngx_uint_t max_write
;
33 static ngx_int_t max_fd
;
36 static ngx_uint_t nevents
;
38 static ngx_event_t
**event_index
;
41 static ngx_str_t select_name
= ngx_string("select");
43 ngx_event_module_t ngx_select_module_ctx
= {
45 NULL
, /* create configuration */
46 ngx_select_init_conf
, /* init configuration */
49 ngx_select_add_event
, /* add an event */
50 ngx_select_del_event
, /* delete an event */
51 ngx_select_add_event
, /* enable an event */
52 ngx_select_del_event
, /* disable an event */
53 NULL
, /* add an connection */
54 NULL
, /* delete an connection */
55 NULL
, /* process the changes */
56 ngx_select_process_events
, /* process the events */
57 ngx_select_init
, /* init the events */
58 ngx_select_done
/* done the events */
63 ngx_module_t ngx_select_module
= {
65 &ngx_select_module_ctx
, /* module context */
66 NULL
, /* module directives */
67 NGX_EVENT_MODULE
, /* module type */
68 NULL
, /* init master */
69 NULL
, /* init module */
70 NULL
, /* init process */
71 NULL
, /* init thread */
72 NULL
, /* exit thread */
73 NULL
, /* exit process */
74 NULL
, /* exit master */
80 ngx_select_init(ngx_cycle_t
*cycle
, ngx_msec_t timer
)
84 if (event_index
== NULL
) {
85 FD_ZERO(&master_read_fd_set
);
86 FD_ZERO(&master_write_fd_set
);
90 if (ngx_process
== NGX_PROCESS_WORKER
91 || cycle
->old_cycle
== NULL
92 || cycle
->old_cycle
->connection_n
< cycle
->connection_n
)
94 index
= ngx_alloc(sizeof(ngx_event_t
*) * 2 * cycle
->connection_n
,
101 ngx_memcpy(index
, event_index
, sizeof(ngx_event_t
*) * nevents
);
102 ngx_free(event_index
);
110 ngx_event_actions
= ngx_select_module_ctx
.actions
;
112 ngx_event_flags
= NGX_USE_LEVEL_EVENT
;
115 max_read
= max_write
= 0;
125 ngx_select_done(ngx_cycle_t
*cycle
)
127 ngx_free(event_index
);
134 ngx_select_add_event(ngx_event_t
*ev
, ngx_int_t event
, ngx_uint_t flags
)
140 ngx_log_debug2(NGX_LOG_DEBUG_EVENT
, ev
->log
, 0,
141 "select add event fd:%d ev:%i", c
->fd
, event
);
143 if (ev
->index
!= NGX_INVALID_INDEX
) {
144 ngx_log_error(NGX_LOG_ALERT
, ev
->log
, 0,
145 "select event fd:%d ev:%i is already set", c
->fd
, event
);
151 if ((event
== NGX_READ_EVENT
) && (max_read
>= FD_SETSIZE
)
152 || (event
== NGX_WRITE_EVENT
) && (max_write
>= FD_SETSIZE
))
154 ngx_log_error(NGX_LOG_ERR
, ev
->log
, 0,
155 "maximum number of descriptors "
156 "supported by select() is %d", FD_SETSIZE
);
160 if (event
== NGX_READ_EVENT
) {
161 FD_SET(c
->fd
, &master_read_fd_set
);
164 } else if (event
== NGX_WRITE_EVENT
) {
165 FD_SET(c
->fd
, &master_write_fd_set
);
171 if (event
== NGX_READ_EVENT
) {
172 FD_SET(c
->fd
, &master_read_fd_set
);
174 } else if (event
== NGX_WRITE_EVENT
) {
175 FD_SET(c
->fd
, &master_write_fd_set
);
178 if (max_fd
!= -1 && max_fd
< c
->fd
) {
186 event_index
[nevents
] = ev
;
195 ngx_select_del_event(ngx_event_t
*ev
, ngx_int_t event
, ngx_uint_t flags
)
203 if (ev
->index
== NGX_INVALID_INDEX
) {
207 ngx_log_debug2(NGX_LOG_DEBUG_EVENT
, ev
->log
, 0,
208 "select del event fd:%d ev:%i", c
->fd
, event
);
212 if (event
== NGX_READ_EVENT
) {
213 FD_CLR(c
->fd
, &master_read_fd_set
);
216 } else if (event
== NGX_WRITE_EVENT
) {
217 FD_CLR(c
->fd
, &master_write_fd_set
);
223 if (event
== NGX_READ_EVENT
) {
224 FD_CLR(c
->fd
, &master_read_fd_set
);
226 } else if (event
== NGX_WRITE_EVENT
) {
227 FD_CLR(c
->fd
, &master_write_fd_set
);
230 if (max_fd
== c
->fd
) {
236 if (ev
->index
< --nevents
) {
237 event_index
[ev
->index
] = event_index
[nevents
];
238 event_index
[ev
->index
]->index
= ev
->index
;
241 ev
->index
= NGX_INVALID_INDEX
;
248 ngx_select_process_events(ngx_cycle_t
*cycle
, ngx_msec_t timer
,
254 ngx_event_t
*ev
, **queue
;
256 struct timeval tv
, *tp
;
261 for (i
= 0; i
< nevents
; i
++) {
262 c
= event_index
[i
]->data
;
263 if (max_fd
< c
->fd
) {
268 ngx_log_debug1(NGX_LOG_DEBUG_EVENT
, cycle
->log
, 0,
269 "change max_fd: %d", max_fd
);
275 if (cycle
->log
->log_level
& NGX_LOG_DEBUG_ALL
) {
276 for (i
= 0; i
< nevents
; i
++) {
279 ngx_log_debug2(NGX_LOG_DEBUG_EVENT
, cycle
->log
, 0,
280 "select event: fd:%d wr:%d", c
->fd
, ev
->write
);
284 ngx_log_debug1(NGX_LOG_DEBUG_EVENT
, cycle
->log
, 0,
285 "max_fd: %d", max_fd
);
290 if (timer
== NGX_TIMER_INFINITE
) {
294 tv
.tv_sec
= (long) (timer
/ 1000);
295 tv
.tv_usec
= (long) ((timer
% 1000) * 1000);
299 ngx_log_debug1(NGX_LOG_DEBUG_EVENT
, cycle
->log
, 0,
300 "select timer: %M", timer
);
302 work_read_fd_set
= master_read_fd_set
;
303 work_write_fd_set
= master_write_fd_set
;
306 ngx_log_debug1(NGX_LOG_DEBUG_EVENT
, cycle
->log
, 0,
308 * (void *) disables "dereferencing type-punned
309 * pointer will break strict-aliasing rules
311 "select read fd_set: %08Xd",
312 *(int *) (void *) &work_read_fd_set
);
317 ready
= select(0, &work_read_fd_set
, &work_write_fd_set
, NULL
, tp
);
321 ready
= select(max_fd
+ 1, &work_read_fd_set
, &work_write_fd_set
, NULL
, tp
);
326 err
= ngx_socket_errno
;
331 if (flags
& NGX_UPDATE_TIME
) {
332 ngx_time_update(0, 0);
335 ngx_log_debug1(NGX_LOG_DEBUG_EVENT
, cycle
->log
, 0,
336 "select ready %d", ready
);
341 ngx_log_error(NGX_LOG_ALERT
, cycle
->log
, err
, "select() failed");
350 if (err
== NGX_EINTR
) {
352 if (ngx_event_timer_alarm
) {
353 ngx_event_timer_alarm
= 0;
357 level
= NGX_LOG_INFO
;
360 level
= NGX_LOG_ALERT
;
363 ngx_log_error(level
, cycle
->log
, err
, "select() failed");
370 if (timer
!= NGX_TIMER_INFINITE
) {
374 ngx_log_error(NGX_LOG_ALERT
, cycle
->log
, 0,
375 "select() returned no events without timeout");
379 ngx_mutex_lock(ngx_posted_events_mutex
);
383 for (i
= 0; i
< nevents
; i
++) {
389 if (FD_ISSET(c
->fd
, &work_write_fd_set
)) {
391 ngx_log_debug1(NGX_LOG_DEBUG_EVENT
, cycle
->log
, 0,
392 "select write %d", c
->fd
);
396 if (FD_ISSET(c
->fd
, &work_read_fd_set
)) {
398 ngx_log_debug1(NGX_LOG_DEBUG_EVENT
, cycle
->log
, 0,
399 "select read %d", c
->fd
);
406 queue
= (ngx_event_t
**) (ev
->accept
? &ngx_posted_accept_events
:
408 ngx_locked_post_event(ev
, queue
);
414 ngx_mutex_unlock(ngx_posted_events_mutex
);
416 if (ready
!= nready
) {
417 ngx_log_error(NGX_LOG_ALERT
, cycle
->log
, 0, "select ready != events");
425 ngx_select_init_conf(ngx_cycle_t
*cycle
, void *conf
)
427 ngx_event_conf_t
*ecf
;
429 ecf
= ngx_event_get_conf(cycle
->conf_ctx
, ngx_event_core_module
);
431 if (ecf
->use
!= ngx_select_module
.ctx_index
) {
435 /* disable warning: the default FD_SETSIZE is 1024U in FreeBSD 5.x */
439 if (cycle
->connection_n
> FD_SETSIZE
) {
440 ngx_log_error(NGX_LOG_EMERG
, cycle
->log
, 0,
441 "the maximum number of files "
442 "supported by select() is %ud", FD_SETSIZE
);
443 return NGX_CONF_ERROR
;
448 #if (NGX_THREADS) && !(NGX_WIN32)
450 ngx_log_error(NGX_LOG_EMERG
, cycle
->log
, 0,
451 "select() is not supported in the threaded mode");
452 return NGX_CONF_ERROR
;