Alternative way (threads)

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eskizo

Joined: 22 Nov 2005
Posts: 59

eskizo 20 Jun 2009, 16:38

Hi! I am new to assembly. I would like to view some alternative ways (optimized) to do the same as the following code:

Code:

format PE GUI 4.0
entry start

include '%fasminc%\win32a.inc'

section '.code' code readable executable

    title1 db 'Thread1', 0
    title2 db 'Thread2', 0
    caption db 'Hello world!', 0

th1:  push MB_OK
  push title1
 push caption
        push HWND_DESKTOP
   call [MessageBox]

       push 1000
   call [Sleep]

    jmp th1
     ret

th2:     push MB_OK
  push title2
 push caption
        push HWND_DESKTOP
   call [MessageBox]

       push 2000
   call [Sleep]

    jmp th2
     ret

start:   push 0 
     push 0 
     push 0 
     push th1
    push 0 
     push 0 
     call [CreateThread]

     push 0 
     push 0 
     push 0 
     push th2
    push 0 
     push 0 
     call [CreateThread]

     push -1
     call [Sleep]            ; 49,7 days!

    push 0
      call [ExitProcess]

section '.import' data import readable

      library kernel32, 'kernel32.dll', user32, 'user32.dll' 

     import kernel32, CreateThread, 'CreateThread', \
 Sleep, 'Sleep', ExitProcess, 'ExitProcess'
      import user32, MessageBox, 'MessageBoxA'

20 Jun 2009, 16:38

asmcoder

Joined: 02 Jun 2008
Posts: 784

asmcoder 20 Jun 2009, 17:02

[content deleted]

Last edited by asmcoder on 14 Aug 2009, 14:50; edited 1 time in total

20 Jun 2009, 17:02

eskizo

Joined: 22 Nov 2005
Posts: 59

eskizo 20 Jun 2009, 19:39

Quote:

return from thread by retn 4 (a var on stack), or by ExitThread.

I'm sorry. I am a very begginer asm coder, could you give me a more detailed explanation? (retn 4 ?). If I use ExitThread to terminate it, do I need to put ret at the end?

Quote:

dont write code/data because they mean noting.

section '.code' code readable executable
section '.code' readable executable

You mean these are equals sections declarations?

20 Jun 2009, 19:39

asmcoder

Joined: 02 Jun 2008
Posts: 784

asmcoder 20 Jun 2009, 20:07

[content deleted]

Last edited by asmcoder on 14 Aug 2009, 14:50; edited 1 time in total

20 Jun 2009, 20:07

Borsuc

Joined: 29 Dec 2005
Posts: 2465
Location: Bucharest, Romania

Borsuc 21 Jun 2009, 00:19

FYI, the section name is constant 8 bytes, so making it null won't make it smaller, it will just pad it with 0s. For compatibility you should name it with a dot and then ANSI characters (maximum 7, because the dot takes one).

21 Jun 2009, 00:19

eskizo

Joined: 22 Nov 2005
Posts: 59

eskizo 22 Jun 2009, 13:06

Thankyou all.

22 Jun 2009, 13:06

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