Priority inversion

Lecture Embedded systems - Lesson 15: Resource access protocols. The main topics covered in this chapter include: scheduling algorithms with restrictions on shared resources (mutual exclusion), problem: priority inversion, algorithms: non-preemptive protocol (NPP), highest locker priority (HLP),...

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A modem computer consists of one or more processors, some main memory, disks, printers, a keyboard, a mouse, a display, network interfaces, and various other input/output devices. All in all, a complex system. If every application programmer had to understand how all these things work in detail, no code would ever get written. Furthermore, managing all these components and using them optimally is an exceedingly challenging job.

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Defining the Extent of Disease and the Prognosis The first priority in patient management after the diagnosis of cancer is established and shared with the patient is to determine the extent of disease. The curability of a tumor usually is inversely proportional to the tumor burden. Ideally, the tumor will be diagnosed before symptoms develop or as a consequence of screening efforts (Chap. 78). A very high proportion of such patients can be cured.

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