As a con-sequence, performance is lost. Another example regards the worst-case interrupt latency, which corresponds to the longest period of time during which interrupts are disabled. In that case, the capability to react fast on external events is limited. Moreover, the probability of loosing external events is increased. There are many other examples, most of them come out of the (embedded) real-time area. One as-pect in the design and implementation of real-time operat-ing systems therefore is to reduce the need for disabling in-terrupts to an absolute minimum or to provide mechanisms that help avoiding such measures at all