42 lines
794 B
NASM
42 lines
794 B
NASM
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format MS COFF
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use32
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MUTEX.lock equ 0
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MUTEX.handle equ 4
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section '.text' align 16 code readable executable
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public @mutex_lock@4
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@mutex_lock@4:
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mov eax, 1
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lock xadd [ecx+MUTEX.lock], eax
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test eax, eax
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jnz .slow
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ret
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.slow:
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push ebx
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push esi
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push edi
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mov edi, ecx
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mov ecx, [edi+MUTEX.handle]
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mov edx, 2
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mov ebx, edx
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xor esi, esi
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align 4
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.again:
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mov eax, edx
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xchg eax, [edi+MUTEX.lock]
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test eax, eax
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jz .ok
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mov eax, 77
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int 0x40
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jmp .again
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.ok:
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pop edi
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pop esi
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pop ebx
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ret
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