diff --git a/programs/develop/ktcc/trunk/libc.obj/include/stdlib.h b/programs/develop/ktcc/trunk/libc.obj/include/stdlib.h
index 2f2681eed..286d0eab9 100644
--- a/programs/develop/ktcc/trunk/libc.obj/include/stdlib.h
+++ b/programs/develop/ktcc/trunk/libc.obj/include/stdlib.h
@@ -43,4 +43,6 @@ extern int  _FUNC(rand)(void);
 extern void _FUNC(__assert_fail)(const char *expr, const char *file, int line, const char *func);
 extern void _FUNC(qsort)(void *base0, size_t n, size_t size, int (*compar)(const void *, const void *));
 
+extern double _FUNC(atof)(const char *ascii);
+
 #endif
diff --git a/programs/develop/ktcc/trunk/libc.obj/include/sys/ksys.h b/programs/develop/ktcc/trunk/libc.obj/include/sys/ksys.h
index c6e3c32aa..4b844b398 100644
--- a/programs/develop/ktcc/trunk/libc.obj/include/sys/ksys.h
+++ b/programs/develop/ktcc/trunk/libc.obj/include/sys/ksys.h
@@ -11,10 +11,10 @@
  * All wrappers must start with the "_ksys_" prefix. 
  * I consider it mandatory to place the wrappers in the correct order in the official documentation. 
  * Enjoy writing your code :)
-*/
 
-// Warning! The end of the file is the old definitions of function/structure names. 
-// They are for compatibility... Better not to use them. */
+ * Warning! The end of the file is the old definitions of function/structure names. 
+ * They are for compatibility... Better not to use them. 
+*/
  
 #ifndef _KSYS_H_
 #define _KSYS_H_
@@ -686,6 +686,8 @@ void _ksys_kill_by_pid(uint32_t PID)
     );
 }
 
+/*===================== Function 18, subfunction 21 ====================*/
+/*=====Get the slot number of the process / thread by identifier.. =====*/
 
 static inline 
 int _ksys_get_thread_slot(int PID){
@@ -962,12 +964,13 @@ uint32_t _ksys_get_skin_height(){
 /*==================== Function 51 - create thread. ====================*/
 
 static inline
-int _ksys_start_thread(void* thread_entry, void* stack_top){
+int _ksys_create_thread(void* thread_entry, void* stack_top){
     int val;
     asm_inline(
         "int $0x40"
         :"=a"(val)
         :"a"(51), "b"(1), "c"(thread_entry), "d"(stack_top)
+        :"memory"
     );
     return val;
 }
diff --git a/programs/develop/ktcc/trunk/libc.obj/samples/Makefile b/programs/develop/ktcc/trunk/libc.obj/samples/Makefile
index 5b65aa5ab..2130a39e8 100644
--- a/programs/develop/ktcc/trunk/libc.obj/samples/Makefile
+++ b/programs/develop/ktcc/trunk/libc.obj/samples/Makefile
@@ -21,6 +21,7 @@ clayer/libimg.kex \
 clayer/dialog.kex \
 clayer/msgbox.kex \
 clayer/boxlib.kex \
+thread_work.kex
 
 LIBS= -ltcc -ldialog -lrasterworks -limg -lbox -lmsgbox -lnetwork -lc.obj
 
diff --git a/programs/develop/ktcc/trunk/libc.obj/samples/thread_work.c b/programs/develop/ktcc/trunk/libc.obj/samples/thread_work.c
new file mode 100644
index 000000000..12d962f35
--- /dev/null
+++ b/programs/develop/ktcc/trunk/libc.obj/samples/thread_work.c
@@ -0,0 +1,69 @@
+/*
+ * An example of using threads to create a copy of a window. 
+ * Built on top of the /programs/develop/examples/thread/trunk/thread.asm example.
+ * 
+ * Created by turbocat (Maxim Logaev) 2021.
+*/
+
+#include <sys/ksys.h>
+#include <stdio.h>
+#include <stdlib.h>
+
+#define TH_STACK_SIZE 1024
+
+enum BUTTONS{
+    BTN_QUIT      = 1,
+    BTN_CREATE_TH = 2,
+};
+
+ksys_colors_table_t sys_colors;
+
+extern int main();
+
+void redraw_window(void){
+    ksys_pos_t mouse_pos = _ksys_get_mouse_pos(KSYS_MOUSE_SCREEN_POS); 
+    _ksys_start_draw();
+    _ksys_create_window(mouse_pos.x, mouse_pos.y, 140, 60, "Threads", sys_colors.work_area, 0x14);
+    _ksys_define_button(10, 30, 120, 20,  BTN_CREATE_TH, sys_colors.work_button);
+    _ksys_draw_text("Create thread!", 15, 34, 0, 0x90000000 | sys_colors.work_button_text);
+    _ksys_end_draw();
+}
+
+void create_thread(void){
+    unsigned tid;  // New thread ID 
+    void *th_stack = malloc(TH_STACK_SIZE); // Allocate memory for thread stack 
+    if(!th_stack){
+         _ksys_debug_puts("Memory allocation error for thread!");
+         return;
+    }
+    tid = _ksys_create_thread(main, th_stack+TH_STACK_SIZE); // Create new thread with entry "main"
+    if(tid==-1){
+        _ksys_debug_puts("Unable to create a new thread!");
+        return;
+    }
+    debug_printf("New thread created (TID=%u)\n", tid);
+}
+
+int main(){
+    _ksys_get_system_colors(&sys_colors);
+    int gui_event;
+    redraw_window();
+    
+    while(1){
+        gui_event = _ksys_get_event(); 
+        switch(gui_event){
+        case KSYS_EVENT_REDRAW:
+            redraw_window();
+            break;
+        case KSYS_EVENT_BUTTON:
+            switch (_ksys_get_button()){
+            case BTN_CREATE_TH:
+                create_thread();
+                break;
+            case BTN_QUIT:
+                _ksys_exit();
+            }
+            break;
+         }
+     }
+}
diff --git a/programs/develop/ktcc/trunk/libc.obj/source/libc.c b/programs/develop/ktcc/trunk/libc.obj/source/libc.c
index 23ffc9d4c..86b2bb1c8 100644
--- a/programs/develop/ktcc/trunk/libc.obj/source/libc.c
+++ b/programs/develop/ktcc/trunk/libc.obj/source/libc.c
@@ -100,6 +100,7 @@
 #include "stdlib/rand.c"
 #include "stdlib/qsort.c"
 #include "stdlib/assert.c"
+#include "stdlib/atof.c"
 
 #include "math/acosh.c"
 #include "math/asinh.c"
diff --git a/programs/develop/ktcc/trunk/libc.obj/source/stdlib/atof.c b/programs/develop/ktcc/trunk/libc.obj/source/stdlib/atof.c
new file mode 100644
index 000000000..f9f7f98a9
--- /dev/null
+++ b/programs/develop/ktcc/trunk/libc.obj/source/stdlib/atof.c
@@ -0,0 +1,8 @@
+/* Copyright (C) 1994 DJ Delorie, see COPYING.DJ for details */
+#include <stdlib.h>
+
+double
+atof(const char *ascii)
+{
+  return strtod(ascii, 0);
+}
diff --git a/programs/develop/ktcc/trunk/libc.obj/source/symbols.txt b/programs/develop/ktcc/trunk/libc.obj/source/symbols.txt
index 9b3505dde..e5baef06b 100644
--- a/programs/develop/ktcc/trunk/libc.obj/source/symbols.txt
+++ b/programs/develop/ktcc/trunk/libc.obj/source/symbols.txt
@@ -46,6 +46,7 @@ abs
 atoi
 atol
 atoll
+atof
 calloc
 div
 exit