diff --git a/sys/kern_thread.pas b/sys/kern_thread.pas
index dffaf5bf..0c6aebb9 100644
--- a/sys/kern_thread.pas
+++ b/sys/kern_thread.pas
@@ -187,8 +187,8 @@ procedure thread_unlock(td:p_kthread);
 function  tdfind(tid:DWORD):p_kthread;
 procedure FOREACH_THREAD_IN_PROC(cb,userdata:Pointer);
 
-function  curkthread:p_kthread; assembler;
-procedure set_curkthread(td:p_kthread); assembler;
+function  curkthread:p_kthread;
+procedure set_curkthread(td:p_kthread);
 
 function  SIGPENDING(td:p_kthread):Boolean; inline;
 function  TD_IS_RUNNING(td:p_kthread):Boolean; inline;
@@ -816,7 +816,7 @@ begin
  Result:=cpu_set_priority(td,prio);
 end;
 
-procedure sched_prio(td:p_kthread;prio:Integer); inline;
+procedure sched_prio(td:p_kthread;prio:Integer);
 begin
  td^.td_base_pri:=prio;
  sched_priority(td, prio);
diff --git a/sys/test/project1.lpr b/sys/test/project1.lpr
index 8bfc33d0..c82597ec 100644
--- a/sys/test/project1.lpr
+++ b/sys/test/project1.lpr
@@ -149,7 +149,9 @@ begin
 
  //SetTlsBase(Pointer(qword(1)));
 
- sleep(1);
+ sig_lock;
+  sleep(1);
+ sig_unlock;
 
  Writeln('GetTlsBase:',HexStr(GetTlsBase));
 
@@ -595,7 +597,7 @@ begin
  _thr_param.rtp       :=@prio;
  _thr_param.name      :='test';
 
- sys_thr_new(@_thr_param,SizeOf(_thr_param));
+ thr_new(@_thr_param,SizeOf(_thr_param));
 
  //readln;
 
diff --git a/sys/thr.pas b/sys/thr.pas
index b3994997..ecf43608 100644
--- a/sys/thr.pas
+++ b/sys/thr.pas
@@ -30,10 +30,16 @@ implementation
 uses
  trap;
 
-function thr_new(param:p_thr_param;param_size:Integer):Integer; assembler; nostackframe;
-asm
- movq  sys_thr_new,%rax
- call  fast_syscall
+function thr_new(param:p_thr_param;param_size:Integer):Integer;
+begin
+ if (curkthread=nil) then
+ begin
+  Result:=sys_thr_new(param,param_size);
+ end else
+ asm
+  movq  sys_thr_new,%rax
+  call  fast_syscall
+ end;
 end;
 
 function thr_self(id:PQWORD):Integer; assembler; nostackframe;
@@ -41,6 +47,7 @@ asm
  movq  sys_thr_self,%rax
  call  fast_syscall
 end;
+
 procedure thr_exit(state:PQWORD); assembler; nostackframe;
 asm
  movq  sys_thr_exit,%rax
diff --git a/sys/trap.pas b/sys/trap.pas
index 0fed30fc..ee319af6 100644
--- a/sys/trap.pas
+++ b/sys/trap.pas
@@ -91,6 +91,11 @@ const
  PCB_FULL_IRET=1;
 
 procedure set_pcb_flags(td:p_kthread;f:Integer);
+
+procedure sig_lock;
+procedure _sig_unlock;
+procedure sig_unlock;
+
 procedure fast_syscall;
 
 implementation
@@ -99,6 +104,45 @@ uses
  vm_machdep,
  kern_sig;
 
+const
+ NOT_PCB_FULL_IRET=not PCB_FULL_IRET;
+ TDF_AST=TDF_ASTPENDING or TDF_NEEDRESCHED;
+
+procedure sig_lock; assembler; nostackframe;
+asm
+ pushf
+ lock incl %gs:(0x710)   //lock interrupt
+ popf
+end;
+
+procedure _sig_unlock; assembler; nostackframe;
+asm
+ pushf
+ lock decl %gs:(0x710)   //unlock interrupt
+ popf
+end;
+
+procedure sig_unlock;
+var
+ td:p_kthread;
+ count:Integer;
+begin
+ asm
+  pushf
+  lock decl %gs:(0x710)   //unlock interrupt
+  popf
+  movl %gs:(0x710),%eax
+  movl %eax,count
+ end;
+ if (count=0) then
+ begin
+  td:=curkthread;
+  if (td=nil) then Exit;
+  if (td^.td_flags and TDF_AST)=0 then Exit;
+  ast;
+ end;
+end;
+
 procedure set_pcb_flags(td:p_kthread;f:Integer); inline;
 begin
  td^.pcb_flags:=f;
@@ -134,10 +178,6 @@ begin
  cpu_set_syscall_retval(td,error);
 end;
 
-const
- NOT_PCB_FULL_IRET=not PCB_FULL_IRET;
- TDF_AST=TDF_ASTPENDING or TDF_NEEDRESCHED;
-
 procedure fast_syscall; assembler; nostackframe;
 label
  _after,
@@ -301,18 +341,6 @@ asm
  //restore rip
 end;
 
-//testl	$TDF_ASTPENDING | TDF_NEEDRESCHED,TD_FLAGS(%rax)
-//2: /* AST scheduled. */
-//sti
-//movq %rsp,%rdi
-//call ast
-//jmp 1b
-//
-//3: /* Requested full context restore, use doreti for that. */
-//MEXITCOUNT
-//jmp doreti
-
-