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format MS COFF

use32

MUTEX.lock      equ 0

MUTEX.handle    equ 4

section '.text' align 16 code readable executable

public @mutex_trylock@4

@mutex_trylock@4:

        mov     edx, 1

        xor     eax, eax

        lock cmpxchg [ecx+MUTEX.lock], edx

        setz    al

        movzx   eax, al

        ret