Classifying IP Addresses

Questions and Answers

Match the following multitasking approaches with their characteristics:

Per-Client Process = Expensive, duplicates the entire state Per-Client Thread = Threads share the same address space Constrained Multitasking = Overhead increases after some point CS556 = Distributed Systems Tutorial

Match the following code snippets with their purposes:

waitpid((pid_t) -1, NULL, WHOANG) = Wait for a child process to terminate pthread_create (&threadID, NULL, ThreadMain, (void *) threadArgs) = Create a new thread HandleTCPClient(clntSock) = Handle a client request free(threadArgs) = Free memory allocated for thread arguments

Match the following system calls with their purposes:

waitpid = Wait for a child process to terminate pthread_create = Create a new thread AcceptTCPConnection = Accept a new client connection CreateTCPServerSocket = Create a new TCP server socket

Match the following multitasking approaches with their overhead:

Per-Client Process = Expensive due to duplication of state Per-Client Thread = Less expensive due to shared address space Constrained Multitasking = Overhead increases after some point Multitasking = No overhead Signup and view all the answers

Match the following code snippets with their languages:

struct ThreadArgs { int clntSock; } = C programming language pthread_detach(pthread_self()) = POSIX Threads void *ThreadMain(void *arg) = C programming language DieWithError("...") = Error handling function Signup and view all the answers

Match the following functions with their purposes:

DieWithError = Handle error and exit CreateTCPServerSocket = Create a new TCP server socket HandleTCPClient = Handle a client request pthread_detach = Detach a thread from the parent process Signup and view all the answers

Match the following data structures with their purposes:

struct ThreadArgs = Hold thread arguments pthread_t = Hold thread ID int clntSock = Hold client socket descriptor unsigned short echoServPort = Hold server port number Signup and view all the answers

Match the following system calls with their return types:

waitpid = Process ID pthread_create = Thread ID AcceptTCPConnection = Client socket descriptor CreateTCPServerSocket = Server socket descriptor Signup and view all the answers

Match the following multitasking approaches with their advantages:

Per-Client Process = Easy to implement Per-Client Thread = Lightweight and efficient Constrained Multitasking = Prevents overhead from increasing Multitasking = No advantage Signup and view all the answers

Match the following code snippets with their purposes:

if (argc != 2) { ... } = Check command line arguments if (pthread_create (&threadID, NULL, ThreadMain, (void *) threadArgs) != 0) { ... } = Check thread creation if ((threadArgs = (struct ThreadArgs *) malloc(sizeof(struct ThreadArgs)))) == NULL) { ... } = Check memory allocation if (processID < 0) { ... } = Check process ID Signup and view all the answers