Operating Systems Question 16 A commuter plane has seats for 19 passengers and a single narrow door that can only accommodate one passenger at a time. Complete the following solution in a way that avoids deadlocks. semaphore seats = 19: semaphore mutex = 1; debark(/ P(&mutex): go_through narrow door0: V(&mutex): V(&seats): } // debark embark(X [A]: [BI: go_through narrow door0: [C: } // embark
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- On a 32-bit processor, a baggy bounds scheme is expected to set all of the bounds table entries to 31 at initialization time. Assume that a buggy implementation with a slot size of 32 bytes performs bounds table initialization inappropriately, resulting in random entries being incorrectly set to 1. Assume that a networked server processes network messages using an uninstrumented library. Assume that this library does not include some buffer overflow bugs (i.e., it never calls unsafe functions such as gets()). However, the server suffers from the above-mentioned bounds table initialization issue, and an attacker may submit messages to the server that force the library to dynamically assign and write memory in an attacker-controlled amount using uninstrumented code that looks like this: / N is the size of the buffer that the intruder gets to choose.for (int I = 0; I N/4; i++, p += 4) char *p = malloc(N); *p = 'a'; *(p+1) = 'b'; *(p+2) = 'c'; *(p+3) = 'd'; Assume the server is using a…Write in C: Quesiton 2. Implementing non-blocking / non-echoing mode for xv6 consoleThe default operation of xv6 console driver is to collect user keypresses into a line of text and toawaken the processes waiting for user input only when the user presses Enter. In addition, xv6console automatically echoes (i.e. prints out on the display) every user keypress. While thisbehaviour is appropriate in many scenarios, it is not suitable for interactive gaming.Implement ioctl() system call for the console driver that switches it into non-echoingm non-blockingmode and test it using sample game supplied to you in user/game.c file This is some of the code: Console.c ---------------------------- #include <stdarg.h> #include "types.h" #include "param.h" #include "spinlock.h" #include "sleeplock.h" #include "fs.h" #include "file.h" #include "memlayout.h" #include "riscv.h" #include "defs.h" #include "proc.h" #include "console.h" #include "ioctl.h" #define BACKSPACE 0x100 #define C(x)…Wireless sensor networks are a special kind of network that facilitates communication. Sensor nodes in WSNs relay information to and from a central base station. The computing resources and storage space of a sensor node are limited. Take, for example, an algorithm that can be solved by solving subproblems. Is it preferable to use dynamic programming or divide and conquer to solve these subproblems independently at various sensor nodes? Try to keep your writing short and sweet.
- Answer the given question with a proper explanation and step-by-step solution. Consider the following source code, where k,l and m are constants declared with #define. The struct lnode is as defined as: struct lnode { char *str; // points to 32-character string struct lnode *next; // points to next node address struct lnode *prev; // points to prev node address }; You will need to determine the values for k, l and m, which are the dimensions of a 3-D array named A. struct lnode A[k][l][m]; int store_ele(int h, int i, int j, struct lnode dest) { A[h][i][j] = dest; return sizeof(A); } On compiling this program (with gcc -O2 -S -fno-asynchronous-unwind-tables) ,gcc generates the following assembly code for the store_ele function: store_ele: endbr64 movslq %edi, %rdi movslq %edx, %rdx movslq %esi, %rsi movdqu 8(%rsp), %xmm0 movq %rdi, %rax leaq (%rdx,%rdx,2), %rdx salq $6, %rax subq %rdi, %rax salq $4, %rax leaq (%rax,%rdx,8), %rax leaq (%rsi,%rsi,4), %rdx leaq (%rsi,%rdx,4), %rdx leaq…keanuu Reaves is looking for a solution that will help scheduling routine maintenace for vehicles in his fleet. He does not want to have to do this manually and would much prefer that a system handle this for him. Automatically based on what the system knows about each car (where the system has been trained by a certified automotive mechanic). Which one of the following best represents the technology that Keanuu is looking to use? -AI, artificial intelligence -expert system -genetic algorithm -fuzzy logicOperating sys :In the following producer and consumer problem using semaphores, explain with an example (semaphore values), how a producer sends a signal to a consumer, so that the consumer does not have to check the buffer all the time. /*program, Producer/Consumer */ semaphore n = 0; /* no of items in the buffer */ semaphore s = 1; /* ME semaphore */ void Producer () { while(TRUE) { produce(); wait(s); append(); signal(s); signal(n); } } void Consumer () { while(TRUE) { wait(n); wait(s); take(); signal(s); consume(); } }
- 17 One example of a hardware solutions to the critical section problem is: Bankers algoroth Preemption Excahnge isnruction set COmpare and shopWireless sensor networks are a particular kind of communication network. Sensor nodes in WSNs are responsible for transmitting data to and from each other and a base station. The amount of processing power and memory available to a sensor node is limited. Take into consideration an algorithm that may be segmented into more manageable difficulties. Which method, divide and conquer or dynamic programming, would you choose to use in order to carry out these subproblems at their respective sensor nodes? Write in a succinct manner.Written In C: Quesiton 2. Implementing non-blocking / non-echoing mode for xv6 consoleThe default operation of xv6 console driver is to collect user keypresses into a line of text and toawaken the processes waiting for user input only when the user presses Enter. In addition, xv6console automatically echoes (i.e. prints out on the display) every user keypress. While thisbehaviour is appropriate in many scenarios, it is not suitable for interactive gaming.Implement ioctl() system call for the console driver that switches it into non-echoingm non-blockingmode and test it using sample game supplied to you in user/game.c fil
- Written In C: Quesiton 2. Implementing non-blocking / non-echoing mode for xv6 consoleThe default operation of xv6 console driver is to collect user keypresses into a line of text and toawaken the processes waiting for user input only when the user presses Enter. In addition, xv6console automatically echoes (i.e. prints out on the display) every user keypress. While thisbehaviour is appropriate in many scenarios, it is not suitable for interactive gaming.Implement ioctl() system call for the console driver that switches it into non-echoingm non-blockingmode and test it using sample game supplied to you in user/game.c file10. Consider the following code: .386 .model flat, stdcall .stack 4096 ExitProcess PROTO, dwExitCode : DWORD .data aVal SDWORD -6 bVal SWORD 19h cVal DWORD 17h .code mov edx, aVal add edx, edx mov eax, 0FFFFFFFFh mov ax, bVal sub edx, eax Show the content of edx and eax after executing each instruction in HexadecimaConsider an online auction system where the current highest bid for each item must be maintained. A person who wishes to bid on an item calls the bid(amount) function, which compares the amount being bid to the current highest bid. If the amount exceeds the current highest bid, the highest bid is set to the new amount. This is illustrated below:void bid(double amount) {if (amount > highestBid)highestBid = amount;} Describe how a race condition is possible in this situation and what might be done to prevent the race condition from occurring. Based on the solution you describe, rewrite the bid function that can solve the problem.