PPT-Traps, Exceptions, System Calls, & Privileged Mode

Hakim Weatherspoon CS 3410 Spring 2011 Computer Science Cornell University PampH Chapter 49 pages 509515 appendix B7 Operating Systems Control Transfers Control Transfers to OS Case 1 Program invokes OS. Hakim Weatherspoon. CS 3410, . Spring 2012. Computer Science. Cornell University. P&H . Chapter. 4.9, pages 509–515, appendix B.7. Administrivia. Project3 available now. Design Doc due . next week. Emily Hudson. WIPO Advanced Research Forum. Geneva, 28-30 May 2012. Debates on the . drafting of exceptions. These debates are often framed around the respective merits of open-ended general provisions (. and other languages… . So what about Ruby?*. Exceptions are . raised. using the . raise. method of Kernel. The . rescue. . clause is used to handle exceptions. Exceptions are instances of the . Exception. P&H Chapter 4.9, pages 509–515, appendix B.7. Operating Systems. Control Transfers. Control Transfers to OS. Case 1: Program invokes OS. eg. : . sbrk. (), . mmap. (), sleep(). Like a function call: invoke, do stuff, return results. They are not what you think. Where does oil and gas come from?. What is a trap?. A trap is a place where oil and gas are barred from further movement, and remember that a trap is trap whether it is barren or productive.. Vietnam War. Jacob . Guzdek. Did booby traps contribute to the war . effeort. for the VC?. Yes, I believe they helped a lot as the VC used booby traps as a big advantage over the US in Vietnam. I believe that booby traps helped the VC “win” the war over the US. lexical representations: . a . variationist. perspective . Gregory R. Guy. phonoLAM. group. July 2013. The problem of lexical scope. Some phonological generalizations are valid . only for . a subset of the lexicon . a quick review… . What happened before exceptions?. must remember to check return value. OR, must pass label/exception handler to every function. Caller. Function. return status. Caller. Function. label to subprogram. Kristen McGatlin and Dr. Tyler Davis. Why do we like what we like?. While there is more that goes into liking something. Subjectivity. Cognitive processes?. Applied Importance?. Work performance: . preferred environment may cause less cognitive strain/stress = higher productivity. Tivoo. Group. Today. You will build your own exception handling code. You will know about some of the finer details of Java exceptions – general vs. specific exception types, finally clauses, . RuntimeExceptions. Vietnam War. Jacob . Guzdek. Did booby traps contribute to the war . effeort. for the VC?. Yes, I believe they helped a lot as the VC used booby traps as a big advantage over the US in Vietnam. I believe that booby traps helped the VC “win” the war over the US. CS1: Java Programming. Colorado State University. Original slides by Daniel Liang. Modified slides by Chris Wilcox. 2. Motivations. When a program runs into a runtime error, the program terminates abnormally. How can you handle the runtime error so that the program can continue to run or terminate gracefully? This is the subject we will introduce in this chapter.. Academic ResourceCenterOverviewExceptions definition and overviewTry/Catch BlocksFinally BlocksOverall ExampleChecked and Unchecked ExceptionsSummaryWhat is an exceptionIn its most general sense an ex Debugging for non-Virtualized Systems . How it’s normally done . App or Lib. (non-privileged). OS Kernel. (privileged). App or Lib. (non-privileged). SW. Debugger. (e.g. GDB) . User-Mode debugging.