diff --git a/auto/lib/conf b/auto/lib/conf
index b5271a2..0739a72 100644
--- a/auto/lib/conf
+++ b/auto/lib/conf
@@ -2,12 +2,15 @@
 if [ $PCRE != NO ]; then
 
     CORE_INCS="$CORE_INCS -I $PCRE"
+    CORE_DEPS="$CORE_DEPS $REGEX_DEPS"
+    CORE_SRCS="$CORE_SRCS $REGEX_SRCS"
 
     if [ "$PLATFORM" = "win32" ]; then
-        CFLAGS="$CFLAGS -D PCRE_STATIC"
+        CFLAGS="$CFLAGS -D PCRE_STATIC -D HAVE_PCRE=1"
         CORE_LIBS="$CORE_LIBS pcre.lib"
         CORE_LINK="$CORE_LINK -libpath:$PCRE"
     else 
+        CFLAGS="$CFLAGS -D HAVE_PCRE=1"
         CORE_DEPS="$CORE_DEPS $PCRE/.libs/libpcre.a"
         CORE_LIBS="$CORE_LIBS -L $PCRE/.libs -lpcre"
     fi
diff --git a/auto/sources b/auto/sources
index 1e8790f..b2eec44 100644
--- a/auto/sources
+++ b/auto/sources
@@ -5,6 +5,7 @@
 
 CORE_DEPS="src/core/nginx.h \
             src/core/ngx_config.h \
+            src/core/ngx_atomic.h \
             src/core/ngx_log.h \
             src/core/ngx_alloc.h \
             src/core/ngx_array.h \
@@ -15,7 +16,6 @@
             src/core/ngx_inet.h \
             src/core/ngx_file.h \
             src/core/ngx_crc.h \
-            src/core/ngx_regex.h \
             src/core/ngx_rbtree.h \
             src/core/ngx_times.h \
             src/core/ngx_connection.h \
@@ -32,13 +32,16 @@
             src/core/ngx_parse.c \
             src/core/ngx_inet.c \
             src/core/ngx_file.c \
-            src/core/ngx_regex.c \
             src/core/ngx_rbtree.c \
             src/core/ngx_times.c \
             src/core/ngx_conf_file.c \
             src/core/ngx_garbage_collector.c"
 
 
+REGEX_DEPS="src/core/ngx_regex.h"
+REGEX_SRCS="src/core/ngx_regex.c"
+
+
 EVENT_MODULES="ngx_events_module ngx_event_core_module"
 
 EVENT_INCS="-I src/event -I src/event/modules"
diff --git a/auto/summary b/auto/summary
index 19afd04..28fe5f5 100644
--- a/auto/summary
+++ b/auto/summary
@@ -2,6 +2,12 @@
 echo
 echo "Configuration summary"
 
+case $PCRE in
+    YES) echo " + using system PCRE library" ;;
+    NO)  echo " + PCRE library is not found" ;;
+    *)   echo " + using PCRE library: $PCRE" ;;
+esac
+
 case $MD5 in
     YES) echo " + using system md5 library" ;;
     NO)  echo " + md5 library is not found" ;;
diff --git a/auto/unix b/auto/unix
index 09115f5..4fd44f4 100755
--- a/auto/unix
+++ b/auto/unix
@@ -83,6 +83,12 @@
 . auto/func
 
 
+ngx_func="strsignal()"
+ngx_func_inc="#include <string.h>"
+ngx_func_test="char *s = strsignal(1)"
+. auto/func
+
+
 ngx_func="strerror_r()"
 ngx_func_inc="#include <string.h>"
 ngx_func_test="char buf[20]; strerror_r(1, buf, 20)"
diff --git a/src/core/nginx.c b/src/core/nginx.c
index 36a8b4b..7deb24f 100644
--- a/src/core/nginx.c
+++ b/src/core/nginx.c
@@ -72,7 +72,7 @@
     int               i;
     ngx_fd_t          fd;
     ngx_log_t        *log;
-    ngx_cycle_t      *cycle;
+    ngx_cycle_t      *cycle, init_cycle;
     ngx_open_file_t  *file;
 #if !(WIN32)
     size_t            len;
@@ -88,10 +88,19 @@
     /* TODO */ ngx_max_sockets = -1;
 
     ngx_time_init();
+#if (HAVE_PCRE)
     ngx_regex_init();
+#endif
 
     log = ngx_log_init_errlog();
 
+
+    /* init_cycle->log is required for signal handlers */
+
+    ngx_memzero(&init_cycle, sizeof(ngx_cycle_t));
+    init_cycle.log = log;
+    ngx_cycle = &init_cycle;
+
     if (ngx_os_init(log) == NGX_ERROR) {
         return 1;
     }
@@ -207,7 +216,7 @@
                 }
 
                 if (rotate) {
-                    ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "rotating logs");
+                    ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopen logs");
 
                     file = cycle->open_files.elts;
                     for (i = 0; i < cycle->open_files.nelts; i++) {
diff --git a/src/core/ngx_atomic.h b/src/core/ngx_atomic.h
new file mode 100644
index 0000000..b24a997
--- /dev/null
+++ b/src/core/ngx_atomic.h
@@ -0,0 +1,13 @@
+#ifndef _NGX_ATOMIC_H_INCLUDED_
+#define _NGX_ATOMIC_H_INCLUDED_
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+#define ngx_atomic_inc(x)   x++;
+#define ngx_atomic_dec(x)   x--;
+
+
+#endif /* _NGX_ATOMIC_H_INCLUDED_ */
diff --git a/src/core/ngx_core.h b/src/core/ngx_core.h
index b2c3d55..75658ba 100644
--- a/src/core/ngx_core.h
+++ b/src/core/ngx_core.h
@@ -15,6 +15,7 @@
 typedef struct ngx_connection_s  ngx_connection_t;
 
 
+#include <ngx_atomic.h>
 #include <ngx_time.h>
 #include <ngx_socket.h>
 #include <ngx_errno.h>
@@ -30,7 +31,9 @@
 #include <ngx_file.h>
 #include <ngx_files.h>
 #include <ngx_crc.h>
+#if (HAVE_PCRE)
 #include <ngx_regex.h>
+#endif
 #include <ngx_rbtree.h>
 #include <ngx_times.h>
 #include <ngx_inet.h>
diff --git a/src/core/ngx_rbtree.c b/src/core/ngx_rbtree.c
index 3e6025f..dc60551 100644
--- a/src/core/ngx_rbtree.c
+++ b/src/core/ngx_rbtree.c
@@ -31,7 +31,7 @@
     /* a binary tree insert */
 
     if (*root == sentinel) {
-        node->parent = sentinel;
+        node->parent = NULL;
         node->left = sentinel;
         node->right = sentinel;
         ngx_rbt_black(node);
@@ -71,7 +71,7 @@
 
     ngx_rbt_red(node);
 
-    while (node->parent && ngx_rbt_is_red(node->parent)) {
+    while (node != *root && ngx_rbt_is_red(node->parent)) {
 
         if (node->parent == node->parent->parent->left) {
             temp = node->parent->parent->right;
@@ -123,61 +123,90 @@
 void ngx_rbtree_delete(ngx_rbtree_t **root, ngx_rbtree_t *sentinel,
                        ngx_rbtree_t *node)
 {
+    ngx_int_t      red;
     ngx_rbtree_t  *subst, *temp, *w;
 
     /* a binary tree delete */
 
-    if (node->left == sentinel || node->right == sentinel) {
+    if (node->left == sentinel) {
+        temp = node->right;
+        subst = node;
+
+    } else if (node->right == sentinel) {
+        temp = node->left;
         subst = node;
 
     } else {
+        subst = ngx_rbtree_min(node->right, sentinel);
 
-        /* find a node successor */
-
-        if (node->right == sentinel) {
-            temp = node;
-            subst = node->parent;
-
-            while (subst != sentinel && temp == subst->right) {
-                 temp = subst;
-                 subst = subst->parent;
-            }
-
+        if (subst->left != sentinel) {
+            temp = subst->left;
         } else {
-            subst = ngx_rbtree_min(node->right, sentinel);
+            temp = subst->right;
         }
     }
 
-    if (subst->left != sentinel) {
-        temp = subst->left;
-    } else {
-        temp = subst->right;
+    if (subst == *root) {
+        /* it's the last node */
+        *root = sentinel;
+        return;
     }
 
-    temp->parent = subst->parent;
+    red = ngx_rbt_is_red(subst);
 
-    if (subst->parent == sentinel) {
-        *root = temp;
-
-    } else if (subst == subst->parent->left) {
+    if (subst == subst->parent->left) {
         subst->parent->left = temp;
 
     } else {
         subst->parent->right = temp;
     }
 
-    if (subst != node) {
-        node->key = subst->key;
-        node->color = subst->color;
+    if (subst == node) {
+
+        temp->parent = subst->parent;
+
+    } else {
+
+        if (subst->parent == node) {
+            temp->parent = subst;
+
+        } else {
+            temp->parent = subst->parent;
+        }
+
+        subst->left = node->left;
+        subst->right = node->right;
+        subst->parent = node->parent;
+        ngx_rbt_copy_color(subst, node);
+
+        if (node == *root) {
+            *root = subst;
+
+        } else {
+            if (node == node->parent->left) {
+                node->parent->left = subst;
+            } else {
+                node->parent->right = subst;
+            }
+        }
+
+        if (subst->left != sentinel) {
+            subst->left->parent = subst;
+        }
+
+        if (subst->right != sentinel) {
+            subst->right->parent = subst;
+        }
     }
 
-    if (ngx_rbt_is_red(subst)) {
+    if (red) {
         return;
     }
 
     /* a delete fixup */
 
-    while (temp->parent != sentinel && ngx_rbt_is_black(temp)) {
+    while (temp != *root && ngx_rbt_is_black(temp)) {
+
         if (temp == temp->parent->left) {
             w = temp->parent->right;
 
@@ -257,7 +286,7 @@
 
     temp->parent = node->parent;
 
-    if (node->parent == sentinel) {
+    if (node == *root) {
         *root = temp;
 
     } else if (node == node->parent->left) {
@@ -287,7 +316,7 @@
 
     temp->parent = node->parent;
 
-    if (node->parent == sentinel) {
+    if (node == *root) {
         *root = temp;
 
     } else if (node == node->parent->right) {
diff --git a/src/event/ngx_event_accept.c b/src/event/ngx_event_accept.c
index 9a08e00..a5a130f 100644
--- a/src/event/ngx_event_accept.c
+++ b/src/event/ngx_event_accept.c
@@ -207,6 +207,7 @@
          *           - atomic increment (x86: lock xadd)
          *             or protection by critical section or mutex
          */
+
         c->number = ngx_connection_counter++;
 
         ngx_log_debug(ev->log, "accept: %d, %d" _ s _ c->number);
diff --git a/src/event/ngx_event_timer.c b/src/event/ngx_event_timer.c
index 4ed9498..416cb13 100644
--- a/src/event/ngx_event_timer.c
+++ b/src/event/ngx_event_timer.c
@@ -22,8 +22,11 @@
 
     ngx_event_timer_rbtree = &ngx_event_timer_sentinel;
     ngx_event_timer_sentinel.left = &ngx_event_timer_sentinel;
+
+#if 0
     ngx_event_timer_sentinel.right = &ngx_event_timer_sentinel;
     ngx_event_timer_sentinel.parent = &ngx_event_timer_sentinel;
+#endif
 
     return NGX_OK;
 }
diff --git a/src/http/ngx_http.c b/src/http/ngx_http.c
index 91fa231..592e1b6 100644
--- a/src/http/ngx_http.c
+++ b/src/http/ngx_http.c
@@ -8,7 +8,16 @@
 static char *ngx_http_block(ngx_conf_t *cf, ngx_command_t *cmd, void *conf);
 
 
-int  ngx_http_max_module;
+int         ngx_http_max_module;
+
+ngx_uint_t  ngx_http_reading_state;
+ngx_uint_t  ngx_http_processing_state;
+ngx_uint_t  ngx_http_writing_state;
+ngx_uint_t  ngx_http_lingering_close_state;
+ngx_uint_t  ngx_http_keepalive_state;
+
+ngx_uint_t  ngx_http_total_requests;
+uint64_t    ngx_http_total_sent;
 
 
 int  (*ngx_http_top_header_filter) (ngx_http_request_t *r);
diff --git a/src/http/ngx_http.h b/src/http/ngx_http.h
index 58d918b..954f695 100644
--- a/src/http/ngx_http.h
+++ b/src/http/ngx_http.h
@@ -87,7 +87,17 @@
 extern ngx_module_t  ngx_http_module;
 
 
-extern int  ngx_max_module;
+extern int         ngx_max_module;
+
+extern ngx_uint_t  ngx_http_reading_state;
+extern ngx_uint_t  ngx_http_processing_state;
+extern ngx_uint_t  ngx_http_writing_state;
+extern ngx_uint_t  ngx_http_lingering_close_state;
+extern ngx_uint_t  ngx_http_keepalive_state;
+
+extern ngx_uint_t  ngx_http_total_requests;
+extern uint64_t    ngx_http_total_sent;
+
 
 
 /* STUB */
diff --git a/src/http/ngx_http_request.c b/src/http/ngx_http_request.c
index 66bf9be..c484d27 100644
--- a/src/http/ngx_http_request.c
+++ b/src/http/ngx_http_request.c
@@ -107,6 +107,8 @@
         return;
     }
 #endif
+
+    ngx_atomic_inc(ngx_http_reading_state);
 }
 
 
@@ -127,6 +129,7 @@
 
     if (rev->timedout) {
         ngx_log_error(NGX_LOG_INFO, c->log, NGX_ETIMEDOUT, "client timed out");
+        ngx_atomic_dec(ngx_http_reading_state);
         ngx_http_close_connection(c);
         return;
     }
@@ -1264,7 +1267,7 @@
     rev = c->read;
     rev->event_handler = ngx_http_lingering_close_handler;
 
-    r->lingering_time = ngx_time() + clcf->lingering_time / 1000;
+    r->lingering_time = ngx_cached_time + clcf->lingering_time / 1000;
     ngx_add_timer(rev, clcf->lingering_timeout);
 
     if (ngx_handle_level_read_event(rev) == NGX_ERROR) {
@@ -1326,7 +1329,7 @@
         return;
     }
 
-    timer = r->lingering_time - ngx_time();
+    timer = r->lingering_time - ngx_cached_time;
     if (timer <= 0) {
         ngx_http_close_request(r, 0);
         ngx_http_close_connection(c);
diff --git a/src/os/unix/ngx_posix_init.c b/src/os/unix/ngx_posix_init.c
index 9ebc3d1..5ae5c73 100644
--- a/src/os/unix/ngx_posix_init.c
+++ b/src/os/unix/ngx_posix_init.c
@@ -91,7 +91,6 @@
 
 void ngx_signal_handler(int signo)
 {
-    char          *name;
     ngx_signal_t  *sig;
 
     for (sig = signals; sig->signo != 0; sig++) {
@@ -100,11 +99,18 @@
         }
     }
 
-    /* STUB */
-    name = strsignal(signo);
+#if (HAVE_STRSIGNAL)
+
     ngx_log_error(NGX_LOG_INFO, ngx_cycle->log, 0,
                   "signal #%d (%s: %s) received, %s",
-                  signo, sig->signame, name, sig->action);
+                  signo, sig->signame, strsignal(signo), sig->action);
+#else
+
+    ngx_log_error(NGX_LOG_INFO, ngx_cycle->log, 0,
+                  "signal #%d (%s) received, %s",
+                  signo, sig->signame, sig->action);
+
+#endif
 
     switch (signo) {