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Futex operation:
Source position: linux.pp line 130
function futex_op(  | 
op: cint;  | 
oparg: cint;  | 
cmp: cint;  | 
cmparg: cint  | 
):cint;  | 
FUTEX_OP Performs an operation on a futex:
FUTEX_OP := ((op and $F) shl 28) or  
            ((cmp and $F) shl 24) or 
            ((oparg and $FFF) shl 12) 
            or (cmparg and $FFF);