Algorithm Math Delphi

function GetUniqueNumber: Integer;
asm
@@1: MOV EDX,1
XCHG Guard,EDX
OR EDX,EDX
JNZ @@2
MOV EAX,Numbers
INC EAX
MOV Numbers,EAX
MOV Guard,EDX
RET
@@2: PUSH 0
CALL Sleep
JMP @@1
end;