flat assembler

flat assembler
Message board for the users of flat assembler.

Index > Windows > Thread

Author

Thread

eskizo

Joined: 22 Nov 2005
Posts: 59

eskizo 15 Jun 2009, 18:07

Hi,

What would happen if I create 2 simutaneous threads (CreateThread), both accessing the registers at the same time, like:

...

Code:

thread1:
xor eax, eax
mov ebx, 10
ret
...

thread2:
or eax, ebx
add eax, 1
ret
...

Does each thread has their "own" registers? or the registers are for all threads at the same time... ?

thankyou!

15 Jun 2009, 18:07

LocoDelAssembly
Your code has a bug

Joined: 06 May 2005
Posts: 4624
Location: Argentina

LocoDelAssembly 15 Jun 2009, 18:13

Quote:

Does each thread has their "own" registers? or the registers are for all threads at the same time... ?

Every thread has its own registers. thread1 will invariably return EAX==0 and EBX==10, and thread2 will return EAX = (EAX | EBX) + 1, where the previous state of both registers won't be inherited from thread1 never.

15 Jun 2009, 18:13

eskizo

Joined: 22 Nov 2005
Posts: 59

eskizo 15 Jun 2009, 20:17

OK, thankyou very much!

15 Jun 2009, 20:17

Borsuc

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

Borsuc 16 Jun 2009, 02:07

When Windows switches between threads it saves their registers, otherwise it would have been total chaos lol!

16 Jun 2009, 02:07

< Last Thread | Next Thread >

Forum Rules:

You cannot post new topics in this forum
You cannot reply to topics in this forum
You cannot edit your posts in this forum
You cannot delete your posts in this forum
You cannot vote in polls in this forum
You cannot attach files in this forum
You can download files in this forum