diff --git a/src/core/ngx_log.c b/src/core/ngx_log.c
index 531c860..7638b6a 100644
--- a/src/core/ngx_log.c
+++ b/src/core/ngx_log.c
@@ -47,7 +47,7 @@
 };
 
 static const char *debug_levels[] = {
-    "debug_core", "debug_alloc", "debug_event", "debug_http"
+    "debug_core", "debug_alloc", "debug_mutex", "debug_event", "debug_http"
 };
 
 
@@ -279,10 +279,6 @@
     ngx_log.file = &ngx_stderr;
     ngx_log.log_level = NGX_LOG_INFO;
 
-#if 0
-    /* STUB */ ngx_log.log_level = NGX_LOG_DEBUG;
-#endif
-
     return &ngx_log;
 }
 
@@ -303,10 +299,6 @@
     ngx_test_null(log, ngx_pcalloc(cycle->pool, sizeof(ngx_log_t)), NULL);
     ngx_test_null(log->file, ngx_conf_open_file(cycle, name), NULL);
 
-#if 0
-    /* STUB */ log->log_level = NGX_LOG_DEBUG | NGX_LOG_DEBUG_CORE | NGX_LOG_DEBUG_ALLOC | NGX_LOG_DEBUG_EVENT | NGX_LOG_DEBUG_HTTP;
-#endif
-
     return log;
 }
 
diff --git a/src/core/ngx_log.h b/src/core/ngx_log.h
index 87090dc..4765f3b 100644
--- a/src/core/ngx_log.h
+++ b/src/core/ngx_log.h
@@ -16,10 +16,11 @@
 #define NGX_LOG_INFO              7
 #define NGX_LOG_DEBUG             8
 
-#define NGX_LOG_DEBUG_CORE        0x10
-#define NGX_LOG_DEBUG_ALLOC       0x20
-#define NGX_LOG_DEBUG_EVENT       0x40
-#define NGX_LOG_DEBUG_HTTP        0x80
+#define NGX_LOG_DEBUG_CORE        0x010
+#define NGX_LOG_DEBUG_ALLOC       0x020
+#define NGX_LOG_DEBUG_MUTEX       0x040
+#define NGX_LOG_DEBUG_EVENT       0x080
+#define NGX_LOG_DEBUG_HTTP        0x100
 
 #define NGX_LOG_DEBUG_FIRST       NGX_LOG_DEBUG_CORE
 #define NGX_LOG_DEBUG_LAST        NGX_LOG_DEBUG_HTTP
diff --git a/src/event/modules/ngx_kqueue_module.c b/src/event/modules/ngx_kqueue_module.c
index 61bf43b..8039c3d 100644
--- a/src/event/modules/ngx_kqueue_module.c
+++ b/src/event/modules/ngx_kqueue_module.c
@@ -369,7 +369,7 @@
     for ( ;; ) {
         timer = ngx_event_find_timer();
 
-#if (NGX_THREADS0)
+#if (NGX_THREADS)
         if (timer == NGX_TIMER_ERROR) {
             return NGX_ERROR;
         }
diff --git a/src/event/ngx_event_accept.c b/src/event/ngx_event_accept.c
index 7de064f..82d235b 100644
--- a/src/event/ngx_event_accept.c
+++ b/src/event/ngx_event_accept.c
@@ -212,6 +212,8 @@
 
 #if (NGX_THREADS)
         if (*(rev->lock)) {
+            ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
+                           "spinlock event " PTR_FMT " in accept", rev);
             ngx_spinlock(rev->lock, 1000);
             ngx_unlock(rev->lock);
         }
diff --git a/src/event/ngx_event_connect.c b/src/event/ngx_event_connect.c
index 4eecd88..c84dcbc 100644
--- a/src/event/ngx_event_connect.c
+++ b/src/event/ngx_event_connect.c
@@ -183,6 +183,15 @@
     rinstance = rev->returned_instance;
     winstance = wev->returned_instance;
 
+#if (NGX_THREADS)
+    if (*(rev->lock)) {
+        ngx_log_debug1(NGX_LOG_DEBUG_EVENT, pc->log, 0,
+                       "spinlock event " PTR_FMT " in connect", rev);
+        ngx_spinlock(rev->lock, 1000);
+        ngx_unlock(rev->lock);
+    }
+#endif
+
     ngx_memzero(c, sizeof(ngx_connection_t));
     ngx_memzero(rev, sizeof(ngx_event_t));
     ngx_memzero(wev, sizeof(ngx_event_t));
diff --git a/src/event/ngx_event_posted.c b/src/event/ngx_event_posted.c
index 41be040..b441b29 100644
--- a/src/event/ngx_event_posted.c
+++ b/src/event/ngx_event_posted.c
@@ -73,8 +73,11 @@
 
 ngx_int_t ngx_event_thread_process_posted(ngx_cycle_t *cycle)
 {
+    ngx_tls_t    *tls;
     ngx_event_t  *ev;
 
+    tls = ngx_thread_get_tls();
+
     for ( ;; ) {
 
         ev = (ngx_event_t *) ngx_posted_events;
@@ -121,6 +124,8 @@
 
             ngx_mutex_unlock(ngx_posted_events_mutex);
 
+            tls->event = ev;
+
             ev->event_handler(ev);
 
             if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
@@ -131,6 +136,9 @@
                 ngx_unlock(ev->lock);
             }
 
+            ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
+                           "posted event " PTR_FMT " is done", ev);
+
             break;
         }
     }
diff --git a/src/event/ngx_event_timer.c b/src/event/ngx_event_timer.c
index 0b38220..c73dfa4 100644
--- a/src/event/ngx_event_timer.c
+++ b/src/event/ngx_event_timer.c
@@ -68,6 +68,11 @@
     ngx_event_t   *ev;
     ngx_rbtree_t  *node;
 
+    if (timer < 0) {
+        /* avoid the endless loop if the time goes backward for some reason */
+        timer = 0;
+    }
+
     for ( ;; ) {
 
         if (ngx_event_timer_rbtree == &ngx_event_timer_sentinel) {
@@ -99,6 +104,9 @@
                  * been handling has expired timer.
                  */
 
+                ngx_log_debug1(NGX_LOG_DEBUG_EVENT, ev->log, 0,
+                               "event " PTR_FMT " is busy in expire timers",
+                               ev);
                 break;
             }
 #endif
diff --git a/src/http/modules/proxy/ngx_http_proxy_handler.c b/src/http/modules/proxy/ngx_http_proxy_handler.c
index 5479717..4f8fbda 100644
--- a/src/http/modules/proxy/ngx_http_proxy_handler.c
+++ b/src/http/modules/proxy/ngx_http_proxy_handler.c
@@ -656,7 +656,7 @@
      * because another thread may reopen the same file descriptor
      * before we clean the connection
      */
-    
+
     if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_OK) {
 
         if (c->read->prev) {
diff --git a/src/os/unix/ngx_freebsd_rfork_thread.c b/src/os/unix/ngx_freebsd_rfork_thread.c
index fcc716c..bb638fa 100644
--- a/src/os/unix/ngx_freebsd_rfork_thread.c
+++ b/src/os/unix/ngx_freebsd_rfork_thread.c
@@ -30,18 +30,18 @@
  */
 
 
-char               *ngx_freebsd_kern_usrstack;
-size_t              ngx_thread_stack_size;
+char                *ngx_freebsd_kern_usrstack;
+size_t               ngx_thread_stack_size;
 
 
-static size_t       rz_size;
-static size_t       usable_stack_size;
-static char        *last_stack;
+static size_t        rz_size;
+static size_t        usable_stack_size;
+static char         *last_stack;
 
-static ngx_uint_t   nthreads;
-static ngx_uint_t   max_threads;
-static ngx_tid_t   *tids;  /* the threads tids array */
-
+static ngx_uint_t    nthreads;
+static ngx_uint_t    max_threads;
+static ngx_tid_t    *tids;      /* the threads tids array */
+void               **ngx_tls;   /* the threads tls's array */
 
 /* the thread-safe libc errno */
 
@@ -220,19 +220,26 @@
                       "red zone address was changed");
     }
 
-    /* create the threads errno array */
+    /* create the threads errno's array */
 
     if (!(errnos = ngx_calloc(n * sizeof(int), cycle->log))) {
         return NGX_ERROR;
     }
 
-    /* create the threads tid array */
+    /* create the threads tids array */
 
     if (!(tids = ngx_calloc((n + 1) * sizeof(ngx_tid_t), cycle->log))) {
         return NGX_ERROR;
     }
 
     tids[0] = ngx_pid;
+
+    /* create the threads tls's array */
+
+    if (!(ngx_tls = ngx_calloc((n + 1) * sizeof(void *), cycle->log))) {
+        return NGX_ERROR;
+    }
+
     nthreads = 1;
 
     last_stack = zone + rz_size;
@@ -263,6 +270,14 @@
 }
 
 
+ngx_int_t ngx_thread_set_tls(void *value)
+{
+    ngx_tls[ngx_gettid()] = value;
+
+    return NGX_OK;
+}
+
+
 ngx_mutex_t *ngx_mutex_init(ngx_log_t *log, uint flags)
 {
     ngx_mutex_t  *m;
@@ -326,10 +341,10 @@
 
 #if (NGX_DEBUG)
     if (try) {
-        ngx_log_debug2(NGX_LOG_DEBUG_CORE, m->log, 0,
+        ngx_log_debug2(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                        "try lock mutex " PTR_FMT " lock:%X", m, m->lock);
     } else {
-        ngx_log_debug2(NGX_LOG_DEBUG_CORE, m->log, 0,
+        ngx_log_debug2(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                        "lock mutex " PTR_FMT " lock:%X", m, m->lock);
     }
 #endif
@@ -360,7 +375,7 @@
                 continue;
             }
 
-            ngx_log_debug2(NGX_LOG_DEBUG_CORE, m->log, 0,
+            ngx_log_debug2(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                            "mutex " PTR_FMT " lock:%X", m, m->lock);
 
             /*
@@ -380,7 +395,7 @@
 
             if (ngx_atomic_cmp_set(&m->lock, old, lock)) {
 
-                ngx_log_debug2(NGX_LOG_DEBUG_CORE, m->log, 0,
+                ngx_log_debug2(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                                "wait mutex " PTR_FMT " lock:%X", m, m->lock);
 
                 /*
@@ -401,7 +416,7 @@
                     return NGX_ERROR;
                 }
 
-                ngx_log_debug2(NGX_LOG_DEBUG_CORE, m->log, 0,
+                ngx_log_debug2(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                                "mutex waked up " PTR_FMT " lock:%X",
                                m, m->lock);
 
@@ -427,7 +442,7 @@
 
         if (tries++ > 1000) {
 
-            ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0,
+            ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                            "mutex " PTR_FMT " is contested", m);
 
             /* the mutex is probably contested so we are giving up now */
@@ -439,7 +454,7 @@
         }
     }
 
-    ngx_log_debug2(NGX_LOG_DEBUG_CORE, m->log, 0,
+    ngx_log_debug2(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                    "mutex " PTR_FMT " is locked, lock:%X", m, m->lock);
 
     return NGX_OK;
@@ -466,7 +481,7 @@
     /* free the mutex */
 
 #if 0
-    ngx_log_debug2(NGX_LOG_DEBUG_CORE, m->log, 0,
+    ngx_log_debug2(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                    "unlock mutex " PTR_FMT " lock:%X", m, old);
 #endif
 
@@ -481,7 +496,7 @@
     }
 
     if (m->semid == -1) {
-        ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0,
+        ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                        "mutex " PTR_FMT " is unlocked", m);
 
         return NGX_OK;
@@ -511,7 +526,7 @@
 
             /* wake up the thread that waits on semaphore */
 
-            ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0,
+            ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                            "wake up mutex " PTR_FMT "", m);
 
             op.sem_num = 0;
@@ -531,7 +546,7 @@
         old = m->lock;
     }
 
-    ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0,
+    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                    "mutex " PTR_FMT " is unlocked", m);
 
     return NGX_OK;
diff --git a/src/os/unix/ngx_freebsd_rfork_thread.h b/src/os/unix/ngx_freebsd_rfork_thread.h
index a9eb1d8..462554f 100644
--- a/src/os/unix/ngx_freebsd_rfork_thread.h
+++ b/src/os/unix/ngx_freebsd_rfork_thread.h
@@ -15,6 +15,14 @@
 #define TID_T_FMT      PID_T_FMT
     
 
+extern void          **ngx_tls;
+
+#define ngx_thread_create_tls()  0
+#define ngx_thread_create_tls_n  ""
+#define ngx_thread_get_tls()     ngx_tls[ngx_gettid()]
+ngx_int_t ngx_thread_set_tls(void *value);
+
+
 #define NGX_MUTEX_LIGHT      1
 
 #define NGX_MUTEX_LOCK_BUSY  0x80000000
diff --git a/src/os/unix/ngx_process_cycle.c b/src/os/unix/ngx_process_cycle.c
index 1a5e5c4..ffb8e58 100644
--- a/src/os/unix/ngx_process_cycle.c
+++ b/src/os/unix/ngx_process_cycle.c
@@ -826,9 +826,10 @@
 {
     ngx_thread_t  *thr = data;
 
-    sigset_t        set;
-    ngx_err_t       err;
-    struct timeval  tv;
+    sigset_t          set;
+    ngx_err_t         err;
+    ngx_tls_t        *tls;
+    struct timeval    tv;
 
     thr->cv->tid = ngx_thread_self();
 
@@ -849,6 +850,19 @@
 
     ngx_setthrtitle("worker thread");
 
+    if (!(tls = ngx_calloc(sizeof(ngx_tls_t), ngx_cycle->log))) {
+        return (void *) 1;
+    }
+
+    err = ngx_thread_create_tls();
+    if (err != 0) {
+        ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, err,
+                      ngx_thread_create_tls_n " failed");
+        return (void *) 1;
+    }
+
+    ngx_thread_set_tls(tls);
+
     if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
         return (void *) 1;
     }
diff --git a/src/os/unix/ngx_pthread_thread.c b/src/os/unix/ngx_pthread_thread.c
index 951123c..d5d816f 100644
--- a/src/os/unix/ngx_pthread_thread.c
+++ b/src/os/unix/ngx_pthread_thread.c
@@ -116,7 +116,7 @@
         return NGX_OK;
     }
 
-    ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0, "lock mutex " PTR_FMT, m);
+    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "lock mutex " PTR_FMT, m);
 
     err = pthread_mutex_lock(&m->mutex);
 
@@ -126,7 +126,7 @@
         return NGX_ERROR;
     }
 
-    ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0,
+    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                    "mutex " PTR_FMT " is locked", m);
 
     return NGX_OK;
@@ -141,7 +141,8 @@
         return NGX_OK;
     }
 
-    ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0, "try lock mutex " PTR_FMT, m);
+    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0,
+                   "try lock mutex " PTR_FMT, m);
 
     err = pthread_mutex_trylock(&m->mutex);
 
@@ -151,7 +152,7 @@
         return NGX_ERROR;
     }
 
-    ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0,
+    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                    "mutex " PTR_FMT " is locked", m);
 
     return NGX_OK;
@@ -166,7 +167,7 @@
         return NGX_OK;
     }
 
-    ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0, "unlock mutex " PTR_FMT, m);
+    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0, "unlock mutex " PTR_FMT, m);
 
     err = pthread_mutex_unlock(&m->mutex);
 
@@ -176,7 +177,7 @@
         return NGX_ERROR;
     }
 
-    ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0,
+    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                    "mutex " PTR_FMT " is unlocked", m);
 
     return NGX_OK;
@@ -239,7 +240,7 @@
     ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0,
                    "cv " PTR_FMT " is waked up", cv);
 
-    ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0,
+    ngx_log_debug1(NGX_LOG_DEBUG_MUTEX, m->log, 0,
                    "mutex " PTR_FMT " is locked", m);
 
     return NGX_OK;
diff --git a/src/os/unix/ngx_thread.h b/src/os/unix/ngx_thread.h
index 3bd9753..e30a148 100644
--- a/src/os/unix/ngx_thread.h
+++ b/src/os/unix/ngx_thread.h
@@ -27,6 +27,12 @@
 #define TID_T_FMT           PTR_FMT
 
 
+#define ngx_thread_create_tls()  pthread_key_create(0, NULL)
+#define ngx_thread_create_tls_n  "pthread_key_create(0, NULL)"
+#define ngx_thread_get_tls()     pthread_getspecific(0)
+#define ngx_thread_set_tls(v)    pthread_setspecific(0, v)
+
+
 #define NGX_MUTEX_LIGHT     0
 
 typedef struct {
@@ -106,4 +112,10 @@
 #endif
 
 
+typedef struct {
+    ngx_event_t  *event;
+} ngx_tls_t;
+
+
+
 #endif /* _NGX_THREAD_H_INCLUDED_ */