kolibrios/contrib/sdk/sources/libsync/m_unlock.asm

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NASM
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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_unlock@4
@mutex_unlock@4:
xor eax, eax
xchg eax, [ecx]
cmp eax, 1
jnz .wake
ret
.wake:
push ebx
mov edx, 1
mov ecx, [ecx+MUTEX.handle]
mov ebx, 3
mov eax, 77
int 0x40
pop ebx
retn