--- a/src/os/unix/ngx_thread.h
+++ b/src/os/unix/ngx_thread.h
@@ -15,12 +15,11 @@
 
 typedef pid_t  ngx_tid_t;
 
-#define TID_T_FMT      PID_T_FMT
-
+#undef ngx_log_pid
+#define ngx_log_pid    ngx_thread_self()
 #define ngx_log_tid    0
 
-#undef ngx_log_pid
-#define ngx_log_pid    ngx_thread_self()
+#define TID_T_FMT      PID_T_FMT
 
 
 #define NGX_MUTEX_LIGHT      1
@@ -35,12 +34,43 @@ typedef volatile struct {
 } ngx_mutex_t;
 
 
+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;
+}
+
+
+
 #else /* use pthreads */
 
 #include <pthread.h>
 
 typedef pthread_t  ngx_tid_t;
 
+#define ngx_gettid()   ((ngx_int_t) pthread_getspecific(0))
 #define ngx_log_tid    ngx_thread_self()
 
 #endif
@@ -51,12 +81,13 @@ int ngx_create_thread(ngx_tid_t *tid, in
                       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_do_lock(m, 1)
-#define ngx_mutex_lock(m)     ngx_mutex_do_lock(m, 0)
-ngx_int_t ngx_mutex_do_lock(ngx_mutex_t *m, ngx_int_t try);
+#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);