For the following two schedules, insert the appropriate locks (shared and exclusive) into the schedule following the strict 2pl protocol. also explain what happens as the scheduler executes each schedule.
note that, if a transaction blocks because of an operation, the transaction with the next operation in the schedule will continue. if you have a deadlock, you need to chose a transaction to abort, release its locks, and let the rest of the schedule continue. you need to restart the aborted transaction again at some point after it has been aborted. when a transaction unblocks, it resumes its operations.

write the actual executed schedule at the end. (ri means transaction i reads an item and wi writes an item.)

(a) r1(a); r2(b); r3(c); w1(b); w2(c); w3(d);

(b) r1(a); r2(b); r3(c); r1(b); r2(c); r3(a); w1(a); w2(b); w3(d);

Fast sportcars the top speeds of sportscars, given in miles per hour, are: 155 mph bmw m5 217 mph lamborghini aventador spyder 205 mph ferrari 488 205 mph nissan gtr 197 mph chevrolet corvette stingray zr1 258 mph bugatti veyron supersport 195 mph dodge viper 270 mph hennessey venom 155 mph bmw m3 195 mph mercedes sl given: topspeeds=[155; 217; 205; 205; 197; 258; 195; 270; 155; 195]; carnames=string(["bmw m5" "lamborghini aventador spyder" "ferrari 488" "nissan gtr" "chevrolet corvette stingray zr1" "bugatti veyron supersport" "dodge viper" "hennessey venom" "bmw m3" "mercedes sl"]); the variable is a rectangular array. write a function called selectcars to identify cars with the top speed within a given range, and display the identified names. the selected cars speed will be in a range given by lowerbound < speed < upperbound. inputs to the function selectcars are: a column array os all car top speeds named topspeeds, the corresponding chara

Ihave a music player on my phone. i can buy songs, add them to playlists and play them. obviously it would be redundant to store each song in each playlist; each playlist is just a list of pointers to the songs. for this lab you will simulate this behavior. your program will need to have options to: add songs to the system library (you will store the text of the first line of the song, rather than the audio) add playlists add songs to a playlist list playlists play a playlist list all of the songs in the library with a count of how many times each song has been played remove a song from a playlist remove a playlist remove a song from the library (and thus from all playlists that contain it) note that we will not be checking many error cases. in real programming this would be bad, you should usually try to recognize and respond to as many types of errors as you can. in the context of class we are trying to acquaint you with as many concepts as possible, so for the sake of educational efficiency we will not be checking most errors in this lab, you may assume that your user provides correct input. you may add all appropriate error testing if you wish, but we will not be testing for it.

The forerunner to cell phones, pdas, and smartphones was