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#include <ngx_config.h>
#include <ngx_types.h>
#include <ngx_log.h>
#include <ngx_time.h>
#include <ngx_connection.h>
#include <ngx_event.h>
#include <ngx_select_module.h>
static fd_set master_read_fds;
static fd_set master_write_fds;
static fd_set work_read_fds;
static fd_set work_write_fds;
#if (WIN32)
static int max_read;
static int max_write;
#else
static int max_fd;
#endif
static ngx_event_t event_queue;
static ngx_event_t timer_queue;
static void ngx_add_timer(ngx_event_t *ev, u_int timer);
static void ngx_inline ngx_del_timer(ngx_event_t *ev);
static fd_set *ngx_select_get_fd_set(ngx_socket_t fd, int event,
ngx_log_t *log);
void ngx_select_init(int max_connections, ngx_log_t *log)
{
#if (WIN32)
if (max_connections > FD_SETSIZE)
ngx_log_error(NGX_LOG_EMERG, log, 0,
"ngx_select_init: maximum number of descriptors "
"supported by select() is %d",
FD_SETSIZE);
#else
if (max_connections >= FD_SETSIZE)
ngx_log_error(NGX_LOG_EMERG, log, 0,
"ngx_select_init: maximum descriptor number"
"supported by select() is %d",
FD_SETSIZE - 1);
#endif
FD_ZERO(&master_read_fds);
FD_ZERO(&master_write_fds);
event_queue.prev = &event_queue;
event_queue.next = &event_queue;
timer_queue.timer_prev = &timer_queue;
timer_queue.timer_next = &timer_queue;
ngx_event_actions.add = ngx_select_add_event;
ngx_event_actions.del = ngx_select_del_event;
ngx_event_actions.process = ngx_select_process_events;
#if (WIN32)
max_read = max_write = 0;
#else
max_fd = -1;
#endif
}
int ngx_select_add_event(ngx_event_t *ev, int event, u_int flags)
{
fd_set *fds;
ngx_connection_t *cn = (ngx_connection_t *) ev->data;
if (event == NGX_TIMER_EVENT) {
ngx_add_timer(ev, flags);
return 0;
}
ngx_assert((flags != NGX_ONESHOT_EVENT), return -1, ev->log,
"ngx_select_add_event: NGX_ONESHOT_EVENT is not supported");
fds = ngx_select_get_fd_set(cn->fd, event, ev->log);
if (fds == NULL)
return -1;
ev->prev = &event_queue;
ev->next = event_queue.next;
event_queue.next->prev = ev;
event_queue.next = ev;
FD_SET(cn->fd, fds);
#if (WIN32)
switch (event) {
case NGX_READ_EVENT:
max_read++;
break;
case NGX_WRITE_EVENT:
max_write++;
break;
}
#else
if (max_fd != -1 && max_fd < cn->fd)
max_fd = cn->fd;
#endif
return 0;
}
int ngx_select_del_event(ngx_event_t *ev, int event)
{
fd_set *fds;
ngx_connection_t *cn = (ngx_connection_t *) ev->data;
if (event == NGX_TIMER_EVENT) {
ngx_del_timer(ev);
return 0;
}
fds = ngx_select_get_fd_set(cn->fd, event, ev->log);
if (fds == NULL)
return -1;
if (ev->prev)
ev->prev->next = ev->next;
if (ev->next) {
ev->next->prev = ev->prev;
ev->prev = NULL;
}
if (ev->prev)
ev->next = NULL;
FD_CLR(cn->fd, fds);
#if (WIN32)
switch (event) {
case NGX_READ_EVENT:
max_read--;
break;
case NGX_WRITE_EVENT:
max_write--;
break;
}
#else
if (max_fd == cn->fd)
max_fd = -1;
#endif
return 0;
}
static fd_set *ngx_select_get_fd_set(ngx_socket_t fd, int event, ngx_log_t *log)
{
ngx_log_debug(log, "ngx_select_get_fd_set: %d %d" _ fd _ event);
#if !(WIN32)
if (fd >= FD_SETSIZE) {
ngx_log_error(NGX_LOG_ERR, log, 0,
"ngx_select_get_event: maximum descriptor number"
"supported by select() is %d",
FD_SETSIZE - 1);
return NULL;
}
#endif
switch (event) {
case NGX_READ_EVENT:
#if (WIN32)
if (max_read >= FD_SETSIZE) {
ngx_log_error(NGX_LOG_ERR, log, 0,
"ngx_select_get_event: maximum number of descriptors "
"supported by select() is %d",
FD_SETSIZE);
return NULL;
}
#endif
return &master_read_fds;
case NGX_WRITE_EVENT:
#if (WIN32)
if (max_write >= FD_SETSIZE) {
ngx_log_error(NGX_LOG_ERR, log, 0,
"ngx_select_get_event: maximum number of descriptors "
"supported by select() is %d",
FD_SETSIZE);
return NULL;
}
#endif
return &master_write_fds;
default:
ngx_assert(0, return NULL, log,
"ngx_select_get_fd_set: invalid event %d" _ event);
}
return NULL;
}
int ngx_select_process_events(ngx_log_t *log)
{
int ready, found;
u_int timer, delta;
ngx_event_t *ev, *nx;
ngx_connection_t *cn;
struct timeval tv, *tp;
work_read_fds = master_read_fds;
work_write_fds = master_write_fds;
if (timer_queue.timer_next != &timer_queue) {
timer = timer_queue.timer_next->timer_delta;
tv.tv_sec = timer / 1000;
tv.tv_usec = (timer % 1000) * 1000;
tp = &tv;
delta = ngx_msec();
} else {
timer = 0;
tp = NULL;
delta = 0;
}
#if !(WIN32)
if (max_fd == -1) {
for (ev = event_queue.next; ev != &event_queue; ev = ev->next) {
cn = (ngx_connection_t *) ev->data;
if (max_fd < cn->fd)
max_fd = cn->fd;
}
ngx_log_debug(log, "ngx_select_process_events: change max_fd: %d" _
max_fd);
}
#endif
ngx_log_debug(log, "ngx_select_process_events: timer: %d" _ timer);
#if (WIN32)
if ((ready = select(0, &work_read_fds, &work_write_fds, NULL, tp))
#else
if ((ready = select(max_fd + 1, &work_read_fds, &work_write_fds, NULL, tp))
#endif
== -1) {
ngx_log_error(NGX_LOG_ALERT, log, ngx_socket_errno,
"ngx_select_process_events: select failed");
return -1;
}
ngx_log_debug(log, "ngx_select_process_events: ready %d" _ ready);
if (timer) {
delta = ngx_msec() - delta;
} else {
ngx_assert((ready != 0), return -1, log,
"ngx_select_process_events: "
"select returns no events without timeout");
}
ngx_log_debug(log, "ngx_select_process_events: "
"timer: %d, delta: %d" _ timer _ delta);
if (timer) {
if (delta >= timer) {
for (ev = timer_queue.timer_next;
ev != &timer_queue && delta >= ev->timer_delta;
/* void */)
{
delta -= ev->timer_delta;
nx = ev->timer_next;
ngx_del_timer(ev);
if (ev->timer_handler(ev) == -1)
ev->close_handler(ev);
ev = nx;
}
} else {
timer_queue.timer_next->timer_delta -= delta;
}
}
for (ev = event_queue.next; ev != &event_queue; ev = ev->next) {
cn = (ngx_connection_t *) ev->data;
found = 0;
if (ev->write) {
if (FD_ISSET(cn->fd, &work_write_fds)) {
ngx_log_debug(log, "ngx_select_process_events: write %d" _
cn->fd);
found = 1;
}
} else {
if (FD_ISSET(cn->fd, &work_read_fds)) {
ngx_log_debug(log, "ngx_select_process_events: read %d" _
cn->fd);
found = 1;
}
}
if (found) {
ev->ready = 1;
if (ev->event_handler(ev) == -1)
ev->close_handler(ev);
ready--;
}
}
ngx_assert((ready == 0), return 0, log,
"ngx_select_process_events: ready != events");
return 0;
}
static void ngx_add_timer(ngx_event_t *ev, u_int timer)
{
ngx_event_t *e;
for (e = timer_queue.timer_next;
e != &timer_queue && timer > e->timer_delta;
e = e->timer_next)
timer -= e->timer_delta;
ev->timer_delta = timer;
ev->timer_next = e;
ev->timer_prev = e->timer_prev;
e->timer_prev->timer_next = ev;
e->timer_prev = ev;
}
static void ngx_inline ngx_del_timer(ngx_event_t *ev)
{
if (ev->timer_prev)
ev->timer_prev->timer_next = ev->timer_next;
if (ev->timer_next) {
ev->timer_next->timer_prev = ev->timer_prev;
ev->timer_prev = NULL;
}
if (ev->timer_prev)
ev->timer_next = NULL;
}
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