new file mode 100644
--- /dev/null
+++ b/src/event/modules/ngx_select_module.c
@@ -0,0 +1,349 @@
+
+#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;
+}