A pressure cooking vessel has a lid and a container. If the degree of catalyst warm-up during the AI is greater than or equal to a predetermined criterion degree of the warm-up and the engine output is greater than or equal to a criterion output, the injection of secondary air is stopped and exhaust gas purification on the catalyst is conducted so as to curb degradation of emissions. Using this information, the user-level thread package determines when IO requests can be satisfied without blocking and implements pre-defined scheduling policies. Data loss due to power interruption during a write operation is also minimized by the described implementations. Each of the connecting members includes a head portion and a fixing portion.