diff --git a/auto/lib/md5/conf b/auto/lib/md5/conf
index 3fc1af6..383821e 100644
--- a/auto/lib/md5/conf
+++ b/auto/lib/md5/conf
@@ -65,7 +65,7 @@
 
             ngx_lib="rsaref md library"
             ngx_lib_test="MD5_CTX md5; MD5Init(&md5)"
-            #ngx_libs=-lmd
+            ngx_libs=-lmd
             . auto/lib/test
         fi
 
diff --git a/auto/os/freebsd b/auto/os/freebsd
index 5fa8e33..2d3353e 100644
--- a/auto/os/freebsd
+++ b/auto/os/freebsd
@@ -54,11 +54,29 @@
      -o $version -ge 500018 ]
 then
     echo " + using kqueue's NOTE_LOWAT"
-
     have=HAVE_LOWAT_EVENT . auto/have
 fi
 
 
+if [ $USE_THREADS = "rfork" ]; then
+
+    echo " + using rfork()"
+
+    # kqueue's EVFILT_SIGNAL is safe
+
+    if [ $version -gt 460101 ]; then
+        echo " + kqueue's EVFILT_SIGNAL is safe"
+        have=HAVE_SAFE_EVFILT_SIGNAL . auto/have
+    else
+        echo "$0: error: the kqueue's EVFILT_SIGNAL is unsafe on this"
+        echo "FreeBSD version, so --with-threads=rfork could not be used"
+        echo
+
+        exit 1
+    fi
+fi
+
+
 if [ $EVENT_AIO = YES ]; then
     have=HAVE_AIO . auto/have
     EVENT_MODULES="$EVENT_MODULES $AIO_MODULE"
diff --git a/auto/sources b/auto/sources
index 3fcf58e..041b23d 100644
--- a/auto/sources
+++ b/auto/sources
@@ -135,9 +135,12 @@
 FREEBSD_DEPS=src/os/unix/ngx_freebsd_config.h
 FREEBSD_SRCS=src/os/unix/ngx_freebsd_init.c
 FREEBSD_SENDFILE_SRCS=src/os/unix/ngx_freebsd_sendfile_chain.c
+FREEBSD_RFORK_DEPS="src/os/unix/ngx_freebsd_rfork_thread.h"
 FREEBSD_RFORK_SRCS="src/os/unix/ngx_freebsd_rfork_thread.c"
 FREEBSD_RFORK_THREAD_SRCS="src/os/unix/rfork_thread.S"
 
+PTHREAD_SRCS="src/os/unix/ngx_pthread_thread.c"
+
 LINUX_DEPS=src/os/unix/ngx_linux_config.h
 LINUX_SRCS=src/os/unix/ngx_linux_init.c
 LINUX_SENDFILE_SRCS=src/os/unix/ngx_linux_sendfile_chain.c
diff --git a/auto/threads b/auto/threads
index 0c5fd56..8f7e10b 100644
--- a/auto/threads
+++ b/auto/threads
@@ -1,13 +1,51 @@
 
-if [ $USE_THREADS = "rfork" ]; then
+case $USE_THREADS in
+    rfork)
+        have=NGX_THREADS . auto/have
+        have=NGX_USE_RFORK . auto/have
+        CORE_DEPS="$CORE_DEPS $FREEBSD_RFORK_DEPS"
+        CORE_SRCS="$CORE_SRCS $FREEBSD_RFORK_SRCS"
 
-    have=NGX_THREADS . auto/have
-    have=NGX_USE_RFORK . auto/have
-    CORE_DEPS="$CORE_DEPS $UNIX_THREADS_DEPS"
-    CORE_SRCS="$CORE_SRCS $FREEBSD_RFORK_SRCS"
+        case $PLATFORM in
+            *:i386)
+                if [ \( $version -gt 500000 -a $version -lt 501000 \) \
+                     -o $version -lt 491000 ]
+                then
+                    CORE_SRCS="$CORE_SRCS $FREEBSD_RFORK_THREAD_SRCS"
+                fi
+            ;;
+        esac
+    ;;
 
-    if [ $version -lt 501000 ]; then
-        CORE_SRCS="$CORE_SRCS $FREEBSD_RFORK_THREAD_SRCS"
-    fi
+    pthread)
+        have=NGX_THREADS . auto/have
+        CORE_SRCS="$CORE_SRCS $PTHREAD_SRCS"
+        CORE_LIBS="$CORE_LIBS -lpthread"
+    ;;
 
-fi
+    freebsd4)
+        have=NGX_THREADS . auto/have
+        CFLAGS="$CFLAGS -pthread"
+        CORE_SRCS="$CORE_SRCS $PTHREAD_SRCS"
+        CORE_LIBS="$CORE_LIBS -pthread"
+    ;;
+
+    lc_r)
+        have=NGX_THREADS . auto/have
+        CORE_SRCS="$CORE_SRCS $PTHREAD_SRCS"
+        CORE_LIBS="$CORE_LIBS -lc_r"
+    ;;
+
+    lthr)
+        have=NGX_THREADS . auto/have
+        CORE_SRCS="$CORE_SRCS $PTHREAD_SRCS"
+        CORE_LIBS="$CORE_LIBS -lthr"
+    ;;
+
+    lkse)
+        have=NGX_THREADS . auto/have
+        CORE_SRCS="$CORE_SRCS $PTHREAD_SRCS"
+        CORE_LIBS="$CORE_LIBS -lkse"
+    ;;
+
+esac
diff --git a/src/core/nginx.c b/src/core/nginx.c
index f657efb..38418a8 100644
--- a/src/core/nginx.c
+++ b/src/core/nginx.c
@@ -35,6 +35,24 @@
       offsetof(ngx_core_conf_t, worker_processes),
       NULL },
 
+#if (NGX_THREADS)
+
+    { ngx_string("worker_threads"),
+      NGX_MAIN_CONF|NGX_DIRECT_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_num_slot,
+      0,
+      offsetof(ngx_core_conf_t, worker_threads),
+      NULL },
+
+    { ngx_string("thread_stack_size"),
+      NGX_MAIN_CONF|NGX_DIRECT_CONF|NGX_CONF_TAKE1,
+      ngx_conf_set_size_slot,
+      0,
+      offsetof(ngx_core_conf_t, thread_stack_size),
+      NULL },
+
+#endif
+
     { ngx_string("user"),
       NGX_MAIN_CONF|NGX_DIRECT_CONF|NGX_CONF_TAKE12,
       ngx_set_user,
@@ -106,12 +124,6 @@
     ctx.argc = argc;
     ctx.argv = argv;
 
-#if (NGX_THREADS)
-    if (ngx_time_mutex_init(log) == NGX_ERROR) {
-        return 1;
-    }
-#endif
-
     if (ngx_getopt(&ctx, &init_cycle) == NGX_ERROR) {
         return 1;
     }
@@ -341,6 +353,10 @@
     ccf->daemon = NGX_CONF_UNSET;
     ccf->master = NGX_CONF_UNSET;
     ccf->worker_processes = NGX_CONF_UNSET;
+#if (NGX_THREADS)
+    ccf->worker_threads = NGX_CONF_UNSET;
+    ccf->thread_stack_size = NGX_CONF_UNSET;
+#endif
     ccf->user = (ngx_uid_t) NGX_CONF_UNSET;
     ccf->group = (ngx_gid_t) NGX_CONF_UNSET;
 
@@ -356,6 +372,12 @@
     ngx_conf_init_value(ccf->master, 1);
     ngx_conf_init_value(ccf->worker_processes, 1);
 
+#if (NGX_THREADS)
+    ngx_conf_init_value(ccf->worker_threads, 0);
+    ngx_threads_n = ccf->worker_threads;
+    ngx_conf_init_size_value(ccf->thread_stack_size, 2 * 1024 * 1024);
+#endif
+
 #if !(WIN32)
 
     /* TODO: default "nobody" user */
diff --git a/src/core/ngx_cycle.h b/src/core/ngx_cycle.h
index e1b5368..5708ce4 100644
--- a/src/core/ngx_cycle.h
+++ b/src/core/ngx_cycle.h
@@ -40,6 +40,12 @@
 
      ngx_str_t   pid;
      ngx_str_t   newpid;
+
+#if (NGX_THREADS)
+     ngx_int_t   worker_threads;
+     size_t      thread_stack_size;
+#endif
+
 } ngx_core_conf_t;
 
 
diff --git a/src/event/modules/ngx_kqueue_module.c b/src/event/modules/ngx_kqueue_module.c
index 9ef39d8..865b343 100644
--- a/src/event/modules/ngx_kqueue_module.c
+++ b/src/event/modules/ngx_kqueue_module.c
@@ -279,9 +279,9 @@
 
 static ngx_int_t ngx_kqueue_set_event(ngx_event_t *ev, int filter, u_int flags)
 {
+    struct kevent     *kev, kv;
     struct timespec    ts;
     ngx_connection_t  *c;
-    struct kevent     *kev, kv;
 
     c = ev->data;
 
@@ -370,7 +370,7 @@
     for ( ;; ) {
         timer = ngx_event_find_timer();
 
-#if (NGX_THREADS)
+#if (NGX_THREADS0)
         if (timer == NGX_TIMER_ERROR) {
             return NGX_ERROR;
         }
@@ -621,7 +621,7 @@
 
     if (ngx_posted_events) {
         if (ngx_threaded) {
-            ngx_cond_signal(ngx_posted_events_cv);
+            ngx_wakeup_worker_thread(cycle);
 
         } else {
             ngx_event_process_posted(cycle);
diff --git a/src/event/ngx_event.c b/src/event/ngx_event.c
index 1d1a9ce..bf748f1 100644
--- a/src/event/ngx_event.c
+++ b/src/event/ngx_event.c
@@ -91,7 +91,7 @@
     ngx_events_commands,                   /* module directives */
     NGX_CORE_MODULE,                       /* module type */
     NULL,                                  /* init module */
-    NULL                                   /* init child */
+    NULL                                   /* init process */
 };
 
 
diff --git a/src/event/ngx_event_posted.c b/src/event/ngx_event_posted.c
index f3ac0da..71853ed 100644
--- a/src/event/ngx_event_posted.c
+++ b/src/event/ngx_event_posted.c
@@ -8,7 +8,6 @@
 
 #if (NGX_THREADS)
 ngx_mutex_t                      *ngx_posted_events_mutex;
-ngx_cond_t                       *ngx_posted_events_cv;
 #endif
 
 
@@ -57,6 +56,19 @@
 
 #if (NGX_THREADS)
 
+void ngx_wakeup_worker_thread(ngx_cycle_t *cycle)
+{
+    ngx_int_t  i;
+
+    for (i = 0; i < ngx_threads_n; i++) {
+        if (ngx_threads[i].state == NGX_THREAD_FREE) {
+            ngx_cond_signal(ngx_threads[i].cv);
+            return;
+        }
+    }
+}
+
+
 ngx_int_t ngx_event_thread_process_posted(ngx_cycle_t *cycle)
 {
     ngx_event_t  *ev;
@@ -71,7 +83,6 @@
                           "posted event " PTR_FMT, ev);
 
             if (ev == NULL) {
-                ngx_mutex_unlock(ngx_posted_events_mutex);
                 return NGX_OK;
             }
 
@@ -144,4 +155,10 @@
     }
 }
 
+#else
+
+void ngx_wakeup_worker_thread(ngx_cycle_t *cycle)
+{
+}
+
 #endif
diff --git a/src/event/ngx_event_posted.h b/src/event/ngx_event_posted.h
index f04a983..cb916db 100644
--- a/src/event/ngx_event_posted.h
+++ b/src/event/ngx_event_posted.h
@@ -26,6 +26,7 @@
 
 
 void ngx_event_process_posted(ngx_cycle_t *cycle);
+void ngx_wakeup_worker_thread(ngx_cycle_t *cycle);
 
 extern ngx_thread_volatile ngx_event_t  *ngx_posted_events;
 
@@ -34,7 +35,6 @@
 ngx_int_t ngx_event_thread_process_posted(ngx_cycle_t *cycle);
 
 extern ngx_mutex_t                      *ngx_posted_events_mutex;
-extern ngx_cond_t                       *ngx_posted_events_cv;
 #endif
 
 
diff --git a/src/os/unix/ngx_freebsd_rfork_thread.c b/src/os/unix/ngx_freebsd_rfork_thread.c
index aa3e78b..6a367bd 100644
--- a/src/os/unix/ngx_freebsd_rfork_thread.c
+++ b/src/os/unix/ngx_freebsd_rfork_thread.c
@@ -10,18 +10,20 @@
 /*
  * The threads implementation uses the rfork(RFPROC|RFTHREAD|RFMEM) syscall
  * to create threads.  All threads use the stacks of the same size mmap()ed
- * below the main stack.  Thus the current thread id is determinated through
- * the stack pointer.
+ * below the main stack.  Thus the current thread id is determinated via
+ * the stack pointer value.
  *
  * The mutex implementation uses the ngx_atomic_cmp_set() operation
- * to acquire a mutex and the SysV semaphore to wait on a mutex or to wake up
+ * to acquire a mutex and the SysV semaphore to wait on a mutex and to wake up
  * the waiting threads.  The light mutex does not use semaphore, so after
  * spinning in the lock the thread calls sched_yield().  However the light
  * mutecies are intended to be used with the "trylock" operation only.
+ * The SysV semop() is a cheap syscall, particularly if it has little sembuf's
+ * and does not use SEM_UNDO.
  *
- * The condition variable implementation uses the SysV semaphore set of two
- * semaphores. The first is used by the CV mutex, and the second is used
- * by the CV to signal.
+ * The condition variable implementation uses signal #64.  The signal handler
+ * is SIG_IGN so the kill() is a cheap syscall.  The thread waits a signal
+ * in kevent().  The use of the EVFILT_SIGNAL is safe since FreeBSD 4.7.
  *
  * This threads implementation currently works on i386 (486+) and amd64
  * platforms only.
@@ -76,7 +78,7 @@
     for ( ;; ) {
 
         if (*lock) {
-            if (ngx_freebsd_hw_ncpu > 1 && tries++ < 1000) {
+            if (ngx_ncpu > 1 && tries++ < 1000) {
                 continue;
             }
 
@@ -110,7 +112,7 @@
 #endif
 
 
-int ngx_create_thread(ngx_tid_t *tid, int (*func)(void *arg), void *arg,
+int ngx_create_thread(ngx_tid_t *tid, void* (*func)(void *arg), void *arg,
                       ngx_log_t *log)
 {
     int    id, err;
@@ -144,15 +146,10 @@
     ngx_log_debug2(NGX_LOG_DEBUG_CORE, log, 0,
                    "thread stack: " PTR_FMT "-" PTR_FMT, stack, stack_top);
 
-#if 1
-    id = rfork_thread(RFPROC|RFTHREAD|RFMEM, stack_top, func, arg);
-#elif 1
-    id = rfork_thread(RFPROC|RFMEM, stack_top, func, arg);
-#elif 1
-    id = rfork_thread(RFFDG|RFCFDG, stack_top, func, arg);
-#else
-    id = rfork(RFFDG|RFCFDG);
-#endif
+    ngx_set_errno(0);
+
+    id = rfork_thread(RFPROC|RFTHREAD|RFMEM, stack_top,
+                      (ngx_rfork_thread_func_pt) func, arg);
 
     err = ngx_errno;
 
@@ -174,10 +171,23 @@
 
 ngx_int_t ngx_init_threads(int n, size_t size, ngx_cycle_t *cycle)
 {
-    size_t   len;
-    char    *red_zone, *zone;
+    char              *red_zone, *zone;
+    size_t             len;
+    ngx_int_t          i;
+    struct sigaction   sa;
 
-    max_threads = n;
+    max_threads = n + 1;
+
+    for (i = 0; i < n; i++) {
+        ngx_memzero(&sa, sizeof(struct sigaction));
+        sa.sa_handler = SIG_IGN;
+        sigemptyset(&sa.sa_mask);
+        if (sigaction(NGX_CV_SIGNAL, &sa, NULL) == -1) {
+            ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
+                          "sigaction(%d, SIG_IGN) failed", NGX_CV_SIGNAL);
+            return NGX_ERROR;
+        }
+    }
 
     len = sizeof(ngx_freebsd_kern_usrstack);
     if (sysctlbyname("kern.usrstack", &ngx_freebsd_kern_usrstack, &len,
@@ -249,14 +259,6 @@
         return ngx_pid;
     }
 
-#if 0
-    if (tids[tid] == 0) {
-        pid = ngx_pid;
-        tids[tid] = pid;
-        return pid;
-    }
-#endif
-
     return tids[tid];
 }
 
@@ -301,7 +303,7 @@
 }
 
 
-void ngx_mutex_done(ngx_mutex_t *m)
+void ngx_mutex_destroy(ngx_mutex_t *m)
 {
     if (semctl(m->semid, 0, IPC_RMID) == -1) {
         ngx_log_error(NGX_LOG_ALERT, m->log, ngx_errno,
@@ -538,43 +540,26 @@
 
 ngx_cond_t *ngx_cond_init(ngx_log_t *log)
 {
-    ngx_cond_t   *cv;
-    union semun   op;
+    ngx_cond_t  *cv;
 
     if (!(cv = ngx_alloc(sizeof(ngx_cond_t), log))) {
         return NULL;
     }
 
+    cv->signo = NGX_CV_SIGNAL;
+    cv->tid = 0;
     cv->log = log;
-
-    cv->semid = semget(IPC_PRIVATE, 2, SEM_R|SEM_A);
-    if (cv->semid == -1) {
-        ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "semget() failed");
-        return NULL;
-    }
-
-    op.val = 0;
-
-    if (semctl(cv->semid, 0, SETVAL, op) == -1) {
-        ngx_log_error(NGX_LOG_ALERT, log, ngx_errno, "semctl(SETVAL) failed");
-
-        if (semctl(cv->semid, 0, IPC_RMID) == -1) {
-            ngx_log_error(NGX_LOG_ALERT, log, ngx_errno,
-                          "semctl(IPC_RMID) failed");
-        }
-
-        return NULL;
-    }
+    cv->kq = -1;
 
     return cv;
 }
 
 
-void ngx_cond_done(ngx_cond_t *cv)
+void ngx_cond_destroy(ngx_cond_t *cv)
 {
-    if (semctl(cv->semid, 0, IPC_RMID) == -1) {
+    if (close(cv->kq) == -1) {
         ngx_log_error(NGX_LOG_ALERT, cv->log, ngx_errno,
-                      "semctl(IPC_RMID) failed");
+                      "kqueue close() failed");
     }
 
     ngx_free(cv);
@@ -583,21 +568,101 @@
 
 ngx_int_t ngx_cond_wait(ngx_cond_t *cv, ngx_mutex_t *m)
 {
-    struct sembuf  op;
+    int              n;
+    ngx_err_t        err;
+    struct kevent    kev;
+    struct timespec  ts;
 
-    ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0,
-                   "cv " PTR_FMT " wait", cv);
+    if (cv->kq == -1) {
 
-    op.sem_num = 0;
-    op.sem_op = -1;
-    op.sem_flg = 0;
+        /*
+         * We have to add the EVFILT_SIGNAL filter in the rfork()ed thread.
+         * Otherwise the thread would not get a signal event.
+         *
+         * However, we have not to open the kqueue in the thread,
+         * it is simply handy do it together.
+         */
 
-    if (semop(cv->semid, &op, 1) == -1) {
-        ngx_log_error(NGX_LOG_ALERT, cv->log, ngx_errno,
-                      "semop() failed while waiting on cv " PTR_FMT, cv);
+        cv->kq = kqueue();
+        if (cv->kq == -1) {
+            ngx_log_error(NGX_LOG_ALERT, cv->log, ngx_errno, "kqueue() failed");
+            return NGX_ERROR;
+        }
+
+        ngx_log_debug2(NGX_LOG_DEBUG_CORE, cv->log, 0,
+                       "cv kq:%d signo:%d", cv->kq, cv->signo);
+
+        kev.ident = cv->signo;
+        kev.filter = EVFILT_SIGNAL;
+        kev.flags = EV_ADD;
+        kev.fflags = 0;
+        kev.data = 0;
+        kev.udata = NULL;
+
+        ts.tv_sec = 0;
+        ts.tv_nsec = 0;
+
+        if (kevent(cv->kq, &kev, 1, NULL, 0, &ts) == -1) {
+            ngx_log_error(NGX_LOG_ALERT, cv->log, ngx_errno, "kevent() failed");
+            return NGX_ERROR;
+        }
+    }
+
+    if (ngx_mutex_unlock(m) == NGX_ERROR) {
         return NGX_ERROR;
     }
 
+    ngx_log_debug3(NGX_LOG_DEBUG_CORE, cv->log, 0,
+                   "cv " PTR_FMT " wait, kq:%d, signo:%d",
+                   cv, cv->kq, cv->signo);
+
+    for ( ;; ) {
+        n = kevent(cv->kq, NULL, 0, &kev, 1, NULL);
+
+        ngx_log_debug2(NGX_LOG_DEBUG_CORE, cv->log, 0,
+                       "cv " PTR_FMT " kevent: %d", cv, n);
+
+        if (n == -1) {
+            err = ngx_errno;
+            ngx_log_error((err == NGX_EINTR) ? NGX_LOG_INFO : NGX_LOG_ALERT,
+                          cv->log, ngx_errno,
+                          "kevent() failed while waiting condition variable "
+                          PTR_FMT, cv);
+
+            if (err == NGX_EINTR) {
+                break;
+            }
+
+            return NGX_ERROR;
+        }
+
+        if (n == 0) {
+            ngx_log_error(NGX_LOG_ALERT, cv->log, 0,
+                          "kevent() returned no events "
+                          "while waiting condition variable " PTR_FMT,
+                          cv);
+            continue;
+        }
+
+        if (kev.filter != EVFILT_SIGNAL) {
+            ngx_log_error(NGX_LOG_ALERT, cv->log, 0,
+                          "kevent() returned unexpected events: %d "
+                          "while waiting condition variable " PTR_FMT,
+                          kev.filter, cv);
+            continue;
+        }
+
+        if (kev.ident != (uintptr_t) cv->signo) {
+            ngx_log_error(NGX_LOG_ALERT, cv->log, 0,
+                          "kevent() returned unexpected signal: %d ",
+                          "while waiting condition variable " PTR_FMT,
+                          kev.ident, cv);
+            continue;
+        }
+
+        break;
+    }
+
     ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0,
                    "cv " PTR_FMT " is waked up", cv);
 
@@ -611,18 +676,14 @@
 
 ngx_int_t ngx_cond_signal(ngx_cond_t *cv)
 {
-    struct sembuf  op;
+    ngx_log_debug3(NGX_LOG_DEBUG_CORE, cv->log, 0,
+                   "cv " PTR_FMT " to signal " PID_T_FMT " %d",
+                   cv, cv->tid, cv->signo);
 
-    ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0,
-                   "cv " PTR_FMT " to signal", cv);
-
-    op.sem_num = 0;
-    op.sem_op = 1;
-    op.sem_flg = 0;
-
-    if (semop(cv->semid, &op, 1) == -1) {
+    if (kill(cv->tid, cv->signo) == -1) {
         ngx_log_error(NGX_LOG_ALERT, cv->log, ngx_errno,
-                      "semop() failed while signaling cv " PTR_FMT, cv);
+                      "kill() failed while signaling condition variable "
+                      PTR_FMT, cv);
         return NGX_ERROR;
     }
 
diff --git a/src/os/unix/ngx_freebsd_rfork_thread.h b/src/os/unix/ngx_freebsd_rfork_thread.h
new file mode 100644
index 0000000..a9eb1d8
--- /dev/null
+++ b/src/os/unix/ngx_freebsd_rfork_thread.h
@@ -0,0 +1,93 @@
+#ifndef _NGX_FREEBSD_RFORK_THREAD_H_INCLUDED_
+#define _NGX_FREEBSD_RFORK_THREAD_H_INCLUDED_
+
+
+#include <sys/ipc.h>
+#include <sys/sem.h>
+#include <sched.h>
+
+typedef pid_t  ngx_tid_t;
+
+#undef ngx_log_pid
+#define ngx_log_pid    ngx_thread_self()
+#define ngx_log_tid    0
+
+#define TID_T_FMT      PID_T_FMT
+    
+
+#define NGX_MUTEX_LIGHT      1
+
+#define NGX_MUTEX_LOCK_BUSY  0x80000000
+
+typedef volatile struct {
+    ngx_atomic_t  lock;
+    ngx_log_t    *log;
+    int           semid;
+} ngx_mutex_t;
+
+
+#define NGX_CV_SIGNAL        64
+
+typedef struct {
+    int           signo;
+    int           kq;
+    ngx_tid_t     tid;
+    ngx_log_t    *log;
+} ngx_cond_t;
+
+
+#define ngx_thread_sigmask(how, set, oset)                         \
+            (sigprocmask(how, set, oset) == -1) ? ngx_errno : 0
+
+#define ngx_thread_sigmask_n   "sigprocmask()"
+
+#define ngx_thread_join(t, p)
+
+#define ngx_setthrtitle(n)     setproctitle(n)
+
+
+extern char    *ngx_freebsd_kern_usrstack;
+extern size_t   ngx_thread_stack_size;
+
+
+static inline int ngx_gettid()
+{
+    char  *sp;
+
+    if (ngx_thread_stack_size == 0) {
+        return 0;
+    }
+
+#if ( __i386__ )
+
+    __asm__ volatile ("mov %%esp, %0" : "=q" (sp));
+
+#elif ( __amd64__ )
+
+    __asm__ volatile ("mov %%rsp, %0" : "=q" (sp));
+
+#else
+
+#error "rfork()ed threads are not supported on this platform"
+
+#endif
+
+    return (ngx_freebsd_kern_usrstack - sp) / ngx_thread_stack_size;
+}
+
+
+ngx_tid_t ngx_thread_self();
+#define ngx_thread_main()   (ngx_gettid() == 0)
+
+
+#define ngx_mutex_trylock(m)  ngx_mutex_dolock(m, 1)
+#define ngx_mutex_lock(m)     ngx_mutex_dolock(m, 0)
+ngx_int_t ngx_mutex_dolock(ngx_mutex_t *m, ngx_int_t try);
+ngx_int_t ngx_mutex_unlock(ngx_mutex_t *m);
+
+
+typedef int (*ngx_rfork_thread_func_pt)(void *arg);
+
+
+
+#endif /* _NGX_FREEBSD_RFORK_THREAD_H_INCLUDED_ */
diff --git a/src/os/unix/ngx_posix_cycle.c b/src/os/unix/ngx_posix_cycle.c
deleted file mode 100644
index 0b712ed..0000000
--- a/src/os/unix/ngx_posix_cycle.c
+++ /dev/null
@@ -1,231 +0,0 @@
-
-
-void ngx_posix_master_cycle(ngx_cycle_t *cycle)
-{
-    static ngx_int_t   sent;
-    static ngx_msec_t  delay = 125;
-
-    if (ngx_process == NGX_PROCESS_MASTER) {
-        if (sent) {
-            ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
-                           "sent signal cycle");
-
-            if (sigprocmask(SIG_UNBLOCK, &set, NULL) == -1) {
-                ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
-                              "sigprocmask() failed");
-                continue;
-            }
-
-            /*
-             * there is very big chance that the pending signals
-             * would be delivered right on the sigprocmask() return
-             */
-
-            if (!ngx_signal) {
-
-                if (delay < 15000) {
-                    delay *= 2;
-                }
-
-                ngx_log_debug1(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
-                               "msleep %d", delay);
-
-                ngx_msleep(delay);
-
-                ngx_gettimeofday(&tv);
-                ngx_time_update(tv.tv_sec);
-
-                ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
-                               "wake up");
-            }
-
-            if (sigprocmask(SIG_BLOCK, &set, NULL) == -1) {
-                ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
-                              "sigprocmask() failed");
-            }
-
-            ngx_signal = 0;
-
-        } else {
-            ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
-                           "sigsuspend");
-
-            sigsuspend(&wset);
-
-            ngx_gettimeofday(&tv);
-            ngx_time_update(tv.tv_sec);
-
-            ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
-                           "wake up");
-        }
-
-    } else { /* NGX_PROCESS_SINGLE */
-        ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
-                       "worker cycle");
-
-        ngx_process_events(cycle->log);
-    }
-
-    if (ngx_reap) {
-        ngx_log_debug0(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
-                       "reap childs");
-
-        live = 0;
-        for (i = 0; i < ngx_last_process; i++) {
-
-            ngx_log_debug6(NGX_LOG_DEBUG_EVENT, cycle->log, 0,
-                           "child: " PID_T_FMT
-                           " s:%d e:%d t:%d d:%d r:%d",
-                           ngx_processes[i].pid,
-                           ngx_processes[i].signal,
-                           ngx_processes[i].exiting,
-                           ngx_processes[i].exited,
-                           ngx_processes[i].detached,
-                           ngx_processes[i].respawn);
-
-            if (ngx_processes[i].exited) {
-
-                if (ngx_processes[i].respawn
-                    && !ngx_processes[i].exiting
-                    && !ngx_terminate
-                    && !ngx_quit)
-                {
-                     if (ngx_spawn_process(cycle,
-                                           ngx_processes[i].proc,
-                                           ngx_processes[i].data,
-                                           ngx_processes[i].name, i)
-                                                                  == NGX_ERROR)
-                     {
-                         ngx_log_error(NGX_LOG_ALERT, cycle->log, 0,
-                                       "can not respawn %s",
-                                       ngx_processes[i].name);
-                     }
-
-                     continue;
-                }
-
-                if (ngx_processes[i].pid == ngx_new_binary) {
-                    ngx_new_binary = 0;
-                }
-
-                if (i != --ngx_last_process) {
-                    ngx_processes[i--] =
-                                               ngx_processes[ngx_last_process];
-                }
-
-            } else if (!ngx_processes[i].detached
-                       && (ngx_terminate || ngx_quit))
-            {
-                live = 1;
-
-            } else if (ngx_processes[i].exiting) {
-                live = 1;
-            }
-        }
-
-        if (!live) {
-            if (ngx_terminate || ngx_quit) {
-
-                if (ngx_inherited && getppid() > 1) {
-                    name = ctx->pid.name.data;
-
-                } else {
-                    name = ctx->name;
-                }
-
-                if (ngx_delete_file(name) == NGX_FILE_ERROR) {
-                    ngx_log_error(NGX_LOG_ALERT, cycle->log,
-                                  ngx_errno,
-                                  ngx_delete_file_n
-                                  " \"%s\" failed", name);
-                }
-
-                ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exit");
-                exit(0);
-
-            } else {
-                sent = 0;
-            }
-        }
-    }
-
-    if (ngx_terminate) {
-        if (delay > 10000) {
-            signo = SIGKILL;
-        } else {
-            signo = ngx_signal_value(NGX_TERMINATE_SIGNAL);
-        }
-
-    } else if (ngx_quit) {
-        signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
-
-    } else {
-
-        if (ngx_noaccept) {
-            signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
-        }
-
-        if (ngx_change_binary) {
-            ngx_change_binary = 0;
-            ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "changing binary");
-            ngx_new_binary = ngx_exec_new_binary(cycle, ctx->argv);
-        }
-
-        if (ngx_reconfigure) {
-            signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
-            ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reconfiguring");
-        }
-
-        if (ngx_reopen) {
-            /* STUB */
-            signo = ngx_signal_value(NGX_SHUTDOWN_SIGNAL);
-
-            ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "reopening logs");
-            ngx_reopen_files(cycle);
-        }
-    }
-
-    if (signo) {
-        for (i = 0; i < ngx_last_process; i++) {
-
-            if (!ngx_processes[i].detached) {
-                ngx_processes[i].signal = signo;
-
-                ngx_log_debug2(NGX_LOG_DEBUG_EVENT,
-                               cycle->log, 0,
-                               "signal " PID_T_FMT " %d",
-                               ngx_processes[i].pid, signo);
-            }
-        }
-
-        delay = 125;
-        signo = 0;
-    }
-
-    for (i = 0; i < ngx_last_process; i++) {
-
-        if (ngx_processes[i].signal == 0) {
-            continue;
-        }
-
-        if (ccf->kqueue_signal != 1) {
-            sent = 1;
-        }
-
-        ngx_log_debug2(NGX_LOG_DEBUG_CORE, cycle->log, 0,
-                       "kill (" PID_T_FMT ", %d)" ,
-                       ngx_processes[i].pid,
-                       ngx_processes[i].signal);
-
-        if (kill(ngx_processes[i].pid, ngx_processes[i].signal) == -1) {
-            ngx_log_error(NGX_LOG_ALERT, cycle->log, ngx_errno,
-                          "kill(%d, %d) failed",
-                          ngx_processes[i].pid, ngx_processes[i].signal);
-            continue;
-        }
-
-        if (ngx_processes[i].signal != ngx_signal_value(NGX_REOPEN_SIGNAL)) {
-            ngx_processes[i].exiting = 1;
-        }
-    }
-}
diff --git a/src/os/unix/ngx_process_cycle.c b/src/os/unix/ngx_process_cycle.c
index 8a0bd6f..97b3014 100644
--- a/src/os/unix/ngx_process_cycle.c
+++ b/src/os/unix/ngx_process_cycle.c
@@ -13,7 +13,8 @@
 static void ngx_worker_process_cycle(ngx_cycle_t *cycle, void *data);
 static void ngx_channel_handler(ngx_event_t *ev);
 #if (NGX_THREADS)
-static int ngx_worker_thread_cycle(void *data);
+static void ngx_wakeup_worker_threads(ngx_cycle_t *cycle);
+static void *ngx_worker_thread_cycle(void *data);
 #endif
 
 
@@ -40,6 +41,12 @@
 ngx_uint_t    ngx_restart;
 
 
+#if (NGX_THREADS)
+volatile ngx_thread_t  ngx_threads[NGX_MAX_THREADS];
+ngx_int_t              ngx_threads_n;
+#endif
+
+
 u_char  master_process[] = "master process";
 
 
@@ -524,9 +531,6 @@
     ngx_listening_t   *ls;
     ngx_core_conf_t   *ccf;
     ngx_connection_t  *c;
-#if (NGX_THREADS)
-    ngx_tid_t          tid;
-#endif
 
     ngx_process = NGX_PROCESS_WORKER;
 
@@ -620,23 +624,34 @@
 
 #if (NGX_THREADS)
 
-    if (ngx_init_threads(5, 128 * 1024 * 1024, cycle) == NGX_ERROR) {
+    if (ngx_time_mutex_init(cycle->log) == NGX_ERROR) {
         /* fatal */
         exit(2);
     }
 
-    if (!(ngx_posted_events_cv = ngx_cond_init(cycle->log))) {
-        /* fatal */
-        exit(2);
-    }
-
-    for (i = 0; i < 2; i++) {
-        if (ngx_create_thread(&tid, ngx_worker_thread_cycle,
-                              cycle, cycle->log) != 0)
+    if (ngx_threads_n) {
+        if (ngx_init_threads(ngx_threads_n,
+                                   ccf->thread_stack_size, cycle) == NGX_ERROR)
         {
             /* fatal */
             exit(2);
         }
+
+        for (n = 0; n < ngx_threads_n; n++) {
+
+            if (!(ngx_threads[n].cv = ngx_cond_init(cycle->log))) {
+                /* fatal */
+                exit(2);
+            }
+
+            if (ngx_create_thread((ngx_tid_t *) &ngx_threads[n].tid,
+                                  ngx_worker_thread_cycle,
+                                  (void *) &ngx_threads[n], cycle->log) != 0)
+            {
+                /* fatal */
+                exit(2);
+            }
+        }
     }
 
 #endif
@@ -646,6 +661,14 @@
             && ngx_event_timer_rbtree == &ngx_event_timer_sentinel)
         {
             ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting");
+
+
+#if (NGX_THREADS)
+            ngx_terminate = 1;
+
+            ngx_wakeup_worker_threads(cycle);
+#endif
+
             /*
              * we do not destroy cycle->pool here because a signal handler
              * that uses cycle->log can be called at this point
@@ -659,6 +682,11 @@
 
         if (ngx_terminate) {
             ngx_log_error(NGX_LOG_INFO, cycle->log, 0, "exiting");
+
+#if (NGX_THREADS)
+            ngx_wakeup_worker_threads(cycle);
+#endif
+
             /*
              * we do not destroy cycle->pool here because a signal handler
              * that uses cycle->log can be called at this point
@@ -752,14 +780,53 @@
 
 #if (NGX_THREADS)
 
-int ngx_worker_thread_cycle(void *data)
+static void ngx_wakeup_worker_threads(ngx_cycle_t *cycle)
 {
-    ngx_cycle_t *cycle = data;
+    ngx_int_t   i;
+    ngx_uint_t  live;
 
-    ngx_err_t       err;
+    for ( ;; ) {
+
+        live = 0;
+
+        for (i = 0; i < ngx_threads_n; i++) {
+            if (ngx_threads[i].state < NGX_THREAD_EXIT) {
+                ngx_cond_signal(ngx_threads[i].cv);
+                live = 1;
+            }
+
+            if (ngx_threads[i].state == NGX_THREAD_EXIT) {
+                ngx_thread_join(ngx_threads[i].tid, NULL);
+                ngx_threads[i].state = NGX_THREAD_DONE;
+            }
+        }
+
+        if (live == 0) {
+            ngx_log_debug0(NGX_LOG_DEBUG_CORE, cycle->log, 0,
+                           "all worker threads are joined");
+
+            /* STUB */
+            ngx_mutex_destroy(ngx_event_timer_mutex);
+            ngx_mutex_destroy(ngx_posted_events_mutex);
+
+            return;
+        }
+
+        ngx_sched_yield();
+    }
+}
+
+
+static void* ngx_worker_thread_cycle(void *data)
+{
+    ngx_thread_t  *thr = data;
+
     sigset_t        set;
+    ngx_err_t       err;
     struct timeval  tv;
 
+    thr->cv->tid = ngx_thread_self();
+
     sigemptyset(&set);
     sigaddset(&set, ngx_signal_value(NGX_RECONFIGURE_SIGNAL));
     sigaddset(&set, ngx_signal_value(NGX_REOPEN_SIGNAL));
@@ -767,32 +834,46 @@
 
     err = ngx_thread_sigmask(SIG_BLOCK, &set, NULL);
     if (err) {
-        ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
+        ngx_log_error(NGX_LOG_ALERT, ngx_cycle->log, err,
                       ngx_thread_sigmask_n " failed");
-        return 1;
+        return (void *) 1;
     }
 
     ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, ngx_errno,
-                   "thread %d started", ngx_thread_self());
+                   "thread " TID_T_FMT " started", ngx_thread_self());
 
-    ngx_setproctitle("worker thread");
+    ngx_setthrtitle("worker thread");
+
+    if (ngx_mutex_lock(ngx_posted_events_mutex) == NGX_ERROR) {
+        return (void *) 1;
+    }
 
     for ( ;; ) {
-        if (ngx_cond_wait(ngx_posted_events_cv, ngx_posted_events_mutex)
+        thr->state = NGX_THREAD_FREE;
+
+        if (ngx_cond_wait(thr->cv, ngx_posted_events_mutex) == NGX_ERROR) {
+            return (void *) 1;
+        }
+
+        if (ngx_terminate) {
+            thr->state = NGX_THREAD_EXIT;
+
+            ngx_mutex_unlock(ngx_posted_events_mutex);
+
+            ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, ngx_errno,
+                           "thread %d is done", ngx_thread_self());
+
+            return (void *) 0;
+        }
+
+        thr->state = NGX_THREAD_BUSY;
+
+        if (ngx_event_thread_process_posted((ngx_cycle_t *) ngx_cycle)
                                                                   == NGX_ERROR)
         {
-            return 1;
-        }
-
-        if (ngx_event_thread_process_posted(cycle) == NGX_ERROR) {
-            return 1;
+            return (void *) 1;
         }
     }
-
-    ngx_log_debug1(NGX_LOG_DEBUG_CORE, ngx_cycle->log, ngx_errno,
-                   "thread %d done", ngx_thread_self());
-
-    return 0;
 }
 
 #endif
diff --git a/src/os/unix/ngx_process_cycle.h b/src/os/unix/ngx_process_cycle.h
index b0a7d62..7c14d3a 100644
--- a/src/os/unix/ngx_process_cycle.h
+++ b/src/os/unix/ngx_process_cycle.h
@@ -14,8 +14,8 @@
 
 
 typedef struct {
-     int           argc;
-     char *const  *argv;
+    int           argc;
+    char *const  *argv;
 } ngx_master_ctx_t;
 
 
diff --git a/src/os/unix/ngx_pthread.c b/src/os/unix/ngx_pthread.c
deleted file mode 100644
index 2491032..0000000
--- a/src/os/unix/ngx_pthread.c
+++ /dev/null
@@ -1,26 +0,0 @@
-
-
-#include <ngx_config.h>
-
-#include <ngx_log.h>
-#include <ngx_pthread.h>
-
-
-int ngx_create_os_thread(ngx_os_tid_t *tid, void *stack,
-                         ngx_thread_start_routine_t func, void *arg,
-                         ngx_log_t log)
-{
-    int              err;
-    pthread_attr_t  *attr;
-
-    attr = NULL;
-
-    err = pthread_create(tid, attr, func, arg);
-
-    if (err != 0) {
-        ngx_log_error(NGX_LOG_ERR, log, err, "pthread_create() failed");
-        return NGX_ERROR;
-    }
-
-    return NGX_OK;
-}
diff --git a/src/os/unix/ngx_pthread.h b/src/os/unix/ngx_pthread.h
deleted file mode 100644
index 845655f..0000000
--- a/src/os/unix/ngx_pthread.h
+++ /dev/null
@@ -1,14 +0,0 @@
-#ifndef _NGX_OS_THREAD_H_INCLUDED_
-#define _NGX_OS_THREAD_H_INCLUDED_
-
-
-#include <pthread.h>
-
-
-typedef pthread_t          ngx_os_tid_t;
-typedef int                ngx_tid_t;
-
-typedef void *(*)(void *)  ngx_thread_start_routine_t
-
-
-#endif /* _NGX_OS_THREAD_H_INCLUDED_ */
diff --git a/src/os/unix/ngx_pthread_thread.c b/src/os/unix/ngx_pthread_thread.c
new file mode 100644
index 0000000..951123c
--- /dev/null
+++ b/src/os/unix/ngx_pthread_thread.c
@@ -0,0 +1,268 @@
+
+/*
+ * Copyright (C) 2002-2004 Igor Sysoev, http://sysoev.ru/en/
+ */
+
+
+#include <ngx_config.h>
+#include <ngx_core.h>
+
+
+static ngx_uint_t   nthreads;
+static ngx_uint_t   max_threads;
+
+
+static pthread_attr_t  thr_attr;
+
+
+int ngx_create_thread(ngx_tid_t *tid, void* (*func)(void *arg), void *arg,
+                      ngx_log_t *log)
+{
+    int  err;
+
+    if (nthreads >= max_threads) {
+        ngx_log_error(NGX_LOG_CRIT, log, 0,
+                      "no more than %d threads can be created", max_threads);
+        return NGX_ERROR;
+    }
+
+    err = pthread_create(tid, &thr_attr, func, arg);
+
+    if (err != 0) {
+        ngx_log_error(NGX_LOG_ALERT, log, err, "pthread_create() failed");
+        return err;
+    }
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, log, 0,
+                   "thread is created: " TID_T_FMT, *tid);
+
+    nthreads++;
+
+    return err;
+}
+
+
+ngx_int_t ngx_init_threads(int n, size_t size, ngx_cycle_t *cycle)
+{   
+    int  err;
+
+    max_threads = n;
+
+    err = pthread_attr_init(&thr_attr);
+
+    if (err != 0) {
+        ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
+                      "pthread_attr_init() failed");
+        return NGX_ERROR;
+    }
+
+    err = pthread_attr_setstacksize(&thr_attr, size);
+
+    if (err != 0) {
+        ngx_log_error(NGX_LOG_ALERT, cycle->log, err,
+                      "pthread_attr_setstacksize() failed");
+        return NGX_ERROR;
+    }
+
+    ngx_threaded = 1;
+
+    return NGX_OK;
+}
+
+
+ngx_mutex_t *ngx_mutex_init(ngx_log_t *log, uint flags)
+{
+    int           err;
+    ngx_mutex_t  *m;
+
+    if (!(m = ngx_alloc(sizeof(ngx_mutex_t), log))) {
+        return NULL;
+    }
+    
+    m->log = log;
+
+    err = pthread_mutex_init(&m->mutex, NULL);
+
+    if (err != 0) {
+        ngx_log_error(NGX_LOG_ALERT, m->log, err,
+                      "pthread_mutex_init() failed");
+        return NULL;
+    }
+
+    return m;
+}
+
+
+void ngx_mutex_destroy(ngx_mutex_t *m)
+{
+    int  err;
+
+    err = pthread_mutex_destroy(&m->mutex);
+
+    if (err != 0) {
+        ngx_log_error(NGX_LOG_ALERT, m->log, err,
+                      "pthread_mutex_destroy(" PTR_FMT ") failed", m);
+    }
+
+    ngx_free(m);
+}
+
+
+ngx_int_t ngx_mutex_lock(ngx_mutex_t *m)
+{
+    int  err;
+
+    if (!ngx_threaded) {
+        return NGX_OK;
+    }
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0, "lock mutex " PTR_FMT, m);
+
+    err = pthread_mutex_lock(&m->mutex);
+
+    if (err != 0) {
+        ngx_log_error(NGX_LOG_ALERT, m->log, err,
+                      "pthread_mutex_lock(" PTR_FMT ") failed", m);
+        return NGX_ERROR;
+    }
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0,
+                   "mutex " PTR_FMT " is locked", m);
+
+    return NGX_OK;
+}
+
+
+ngx_int_t ngx_mutex_trylock(ngx_mutex_t *m)
+{
+    int  err;
+
+    if (!ngx_threaded) {
+        return NGX_OK;
+    }
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0, "try lock mutex " PTR_FMT, m);
+
+    err = pthread_mutex_trylock(&m->mutex);
+
+    if (err != 0) {
+        ngx_log_error(NGX_LOG_ALERT, m->log, err,
+                      "pthread_mutex_trylock(" PTR_FMT ") failed", m);
+        return NGX_ERROR;
+    }
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0,
+                   "mutex " PTR_FMT " is locked", m);
+
+    return NGX_OK;
+}
+
+
+ngx_int_t ngx_mutex_unlock(ngx_mutex_t *m)
+{
+    int  err;
+
+    if (!ngx_threaded) {
+        return NGX_OK;
+    }
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0, "unlock mutex " PTR_FMT, m);
+
+    err = pthread_mutex_unlock(&m->mutex);
+
+    if (err != 0) {
+        ngx_log_error(NGX_LOG_ALERT, m->log, err,
+                      "pthread_mutex_unlock(" PTR_FMT ") failed", m);
+        return NGX_ERROR;
+    }
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, m->log, 0,
+                   "mutex " PTR_FMT " is unlocked", m);
+
+    return NGX_OK;
+}
+
+
+ngx_cond_t *ngx_cond_init(ngx_log_t *log)
+{
+    int          err;
+    ngx_cond_t  *cv;
+
+    if (!(cv = ngx_alloc(sizeof(ngx_cond_t), log))) {
+        return NULL;
+    }
+    
+    cv->log = log;
+
+    err = pthread_cond_init(&cv->cond, NULL);
+
+    if (err != 0) {
+        ngx_log_error(NGX_LOG_ALERT, cv->log, err,
+                      "pthread_cond_init() failed");
+        return NULL;
+    }
+
+    return cv;
+}
+
+
+void ngx_cond_destroy(ngx_cond_t *cv)
+{
+    int  err;
+
+    err = pthread_cond_destroy(&cv->cond);
+
+    if (err != 0) {
+        ngx_log_error(NGX_LOG_ALERT, cv->log, err,
+                      "pthread_cond_destroy(" PTR_FMT ") failed", cv);
+    }
+
+    ngx_free(cv);
+}
+
+
+ngx_int_t ngx_cond_wait(ngx_cond_t *cv, ngx_mutex_t *m)
+{
+    int  err;
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0,
+                   "cv " PTR_FMT " wait", cv);
+
+    err = pthread_cond_wait(&cv->cond, &m->mutex);
+
+    if (err != 0) {
+        ngx_log_error(NGX_LOG_ALERT, cv->log, err,
+                      "pthread_cond_wait(" PTR_FMT ") failed", cv);
+        return NGX_ERROR;
+    }
+
+    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,
+                   "mutex " PTR_FMT " is locked", m);
+
+    return NGX_OK;
+}
+
+
+ngx_int_t ngx_cond_signal(ngx_cond_t *cv)
+{
+    int  err;
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0,
+                   "cv " PTR_FMT " to signal", cv);
+
+    err = pthread_cond_signal(&cv->cond);
+
+    if (err != 0) {
+        ngx_log_error(NGX_LOG_ALERT, cv->log, err,
+                      "pthread_cond_signal(" PTR_FMT ") failed", cv);
+        return NGX_ERROR;
+    }
+
+    ngx_log_debug1(NGX_LOG_DEBUG_CORE, cv->log, 0,
+                   "cv " PTR_FMT " is signaled", cv);
+
+    return NGX_OK;
+}
diff --git a/src/os/unix/ngx_thread.h b/src/os/unix/ngx_thread.h
index a140403..3bd9753 100644
--- a/src/os/unix/ngx_thread.h
+++ b/src/os/unix/ngx_thread.h
@@ -7,111 +7,84 @@
 
 #if (NGX_THREADS)
 
-#define ngx_thread_volatile  volatile
+#define NGX_MAX_THREADS      128
 
 #if (NGX_USE_RFORK)
-
-#include <sys/ipc.h>
-#include <sys/sem.h>
-#include <sched.h>
-
-typedef pid_t  ngx_tid_t;
-
-#undef ngx_log_pid
-#define ngx_log_pid    ngx_thread_self()
-#define ngx_log_tid    0
-
-#define TID_T_FMT      PID_T_FMT
-
-
-#define NGX_MUTEX_LIGHT      1
-#define NGX_MUTEX_CV         2
-
-#define NGX_MUTEX_LOCK_BUSY  0x80000000
-
-typedef volatile struct {
-    ngx_atomic_t  lock;
-    ngx_log_t    *log;
-    int           semid;
-} ngx_mutex_t;
-
-
-typedef struct {
-    int           semid;
-    ngx_log_t    *log;
-} ngx_cond_t;
-
-
-#define ngx_thread_sigmask(how, set, oset)                         \
-            (sigprocmask(how, set, oset) == -1) ? ngx_errno : 0
-
-#define ngx_thread_sigmask_n  "sigprocmask()"
-
-
-extern char    *ngx_freebsd_kern_usrstack;
-extern size_t   ngx_thread_stack_size;
-
-static inline int ngx_gettid()
-{
-    char  *sp;
-
-    if (ngx_thread_stack_size == 0) {
-        return 0;
-    }
-
-#if ( __i386__ )
-
-    __asm__ volatile ("mov %%esp, %0" : "=q" (sp));
-
-#elif ( __amd64__ )
-
-    __asm__ volatile ("mov %%rsp, %0" : "=q" (sp));
-
-#else
-
-#error "rfork()ed threads are not supported on this platform"
-
-#endif
-
-    return (ngx_freebsd_kern_usrstack - sp) / ngx_thread_stack_size;
-}
-
-
-#define ngx_thread_main()   (ngx_gettid() == 0)
+#include <ngx_freebsd_rfork_thread.h>
 
 
 #else /* use pthreads */
 
 #include <pthread.h>
+#include <pthread_np.h>
 
 typedef pthread_t  ngx_tid_t;
 
-#define ngx_gettid()   ((ngx_int_t) pthread_getspecific(0))
-#define ngx_log_tid    ngx_thread_self()
+#define ngx_thread_self()   pthread_self()
+#define ngx_thread_main()   pthread_main_np()
+#define ngx_log_tid         (int) ngx_thread_self()
+
+#define TID_T_FMT           PTR_FMT
+
+
+#define NGX_MUTEX_LIGHT     0
+
+typedef struct {
+    pthread_mutex_t   mutex;
+    ngx_log_t        *log;
+} ngx_mutex_t;
+
+typedef struct {
+    pthread_cond_t    cond;
+    ngx_tid_t         tid;
+    ngx_log_t        *log;
+} ngx_cond_t;
 
 #define ngx_thread_sigmask     pthread_sigmask
 #define ngx_thread_sigmask_n  "pthread_sigmask()"
 
+#define ngx_thread_join(t, p)  pthread_join(t, p)
+
+#define ngx_setthrtitle(n)
+
+
+
+ngx_int_t ngx_mutex_trylock(ngx_mutex_t *m);
+ngx_int_t ngx_mutex_lock(ngx_mutex_t *m);
+ngx_int_t ngx_mutex_unlock(ngx_mutex_t *m);
+
 #endif
 
 
+#define ngx_thread_volatile   volatile
+
+
+typedef struct {
+    ngx_tid_t    tid;
+    ngx_cond_t  *cv;
+    ngx_uint_t   state;
+} ngx_thread_t;
+
+#define NGX_THREAD_FREE   1
+#define NGX_THREAD_BUSY   2
+#define NGX_THREAD_EXIT   3
+#define NGX_THREAD_DONE   4
+
+extern ngx_int_t              ngx_threads_n;
+extern volatile ngx_thread_t  ngx_threads[NGX_MAX_THREADS];
+
+
 ngx_int_t ngx_init_threads(int n, size_t size, ngx_cycle_t *cycle);
-int ngx_create_thread(ngx_tid_t *tid, int (*func)(void *arg), void *arg,
+int ngx_create_thread(ngx_tid_t *tid, void* (*func)(void *arg), void *arg,
                       ngx_log_t *log);
-ngx_tid_t ngx_thread_self();
 
 
 ngx_mutex_t *ngx_mutex_init(ngx_log_t *log, uint flags);
-void ngx_mutex_done(ngx_mutex_t *m);
-
-#define ngx_mutex_trylock(m)  ngx_mutex_dolock(m, 1)
-#define ngx_mutex_lock(m)     ngx_mutex_dolock(m, 0)
-ngx_int_t ngx_mutex_dolock(ngx_mutex_t *m, ngx_int_t try);
-ngx_int_t ngx_mutex_unlock(ngx_mutex_t *m);
+void ngx_mutex_destroy(ngx_mutex_t *m);
 
 
 ngx_cond_t *ngx_cond_init(ngx_log_t *log);
-void ngx_cond_done(ngx_cond_t *cv);
+void ngx_cond_destroy(ngx_cond_t *cv);
 ngx_int_t ngx_cond_wait(ngx_cond_t *cv, ngx_mutex_t *m);
 ngx_int_t ngx_cond_signal(ngx_cond_t *cv);