21. Time sharing system often used in a dedicated application, this system reads information from sensors and must respond within a fixed amount of time to ensure correct performance. Answer: 22. A semaphore S is an integer variable that is accessed only through two standard atomic operations. Answer: 23. Threads do not share the memory and the resources of the process to which they belong. Answer: 24. The interrupt technics is a kind of the hardware technics. Answer: 25. A multithreaded solution using multiple user-level threads could achieve better performance on a multiprocessor system than on a single-processor system. Answer: TF 26. The process could be removed forcibly from the CPU, as a result of a clock interrupt, and be put back in the ready queue. Answer: TF