Operating Systems – CSCI 402 Handling Signals Two ways to handle signals handling it asynchronously using signal handlers handling it synchronously using sigwait() in a signal-catching thread 1 321 0 Copyright ý . Signals Asynchronously Signal handler each signal in a process can have at most one handler to specify a signal handler of a […]
CS代考 Operating Systems – CSCI 402 Read More »
Operating Systems – CSCI 402 5.1.1.3 Scheduler Activations Model 40 321 0 Copyright ý . Systems – CSCI 402 Problems With Two-level Model Two-level model does not solve the I/O blocking problem if there are N kernel threads and if N user threads are blocked in I/O no other user threads can make progress Solaris
CS代考 Operating Systems – CSCI 402 Read More »
C Crash Course (II): C Basics for System Programming Presented by Dr. Shuaiwen Leon Song USYD Future System Architecture Lab (FSA) https://shuaiwen-leon-song.github.io/ Warmup Contents FACULTY OF ENGINEERING What is the printout of this code? Segmentation fault (core dump) ! Core Dump/Segmentation Fault Core Dump/Segmentation fault is a specific kind of error caused by accessing memory
CS代考 C Crash Course (II): C Basics for System Programming Read More »
l-calculus Back to this: SUCC := λnfx.f (n f x) This function takes how many 3 arguments? What are the formal arguments? n,f,x notnfx 1 l-calculus λx. a b how many formal arguments? 1 (λx.ab)(abc) Whatisreturned? ab Why? The formal argument is not used in the function. Like: (defun strange (x) (+ 1 2)) 2
CS代考 l-calculus Back to this: Read More »
Operating Systems – CSCI 402 Signals and Blocking System Calls What if a signal is generated while a process is blocked in a system call? 1) deal with it when the system call completes 2) interrupt the system call, deal with signal, resume system call 3) interrupt system call, deal with signal, return from system
程序代写 Operating Systems – CSCI 402 Read More »
C Crash Course (I): C Basics for System Programming Presented by Dr. Shuaiwen Leon Song USYD Future System Architecture Lab (FSA) https://shuaiwen-leon-song.github.io/ COMMONWEALTH OF AUSTRALIA Copyright Regulations 1969 WARNING This material has been reproduced and communicated to you by or on behalf of the University of Sydney pursuant to Part VB of the Copyright Act
CS代考 C Crash Course (I): C Basics for System Programming Read More »
proc1( ) { pthread_mutex_lock(&m1); /* use object 1 */ pthread_mutex_lock(&m2); /* use objects 1 and 2 */ pthread_mutex_unlock(&m2); pthread_mutex_unlock(&m1); proc2( ) { pthread_mutex_lock(&m2); /* use object 2 */ pthread_mutex_lock(&m1); /* use objects 1 and 2 */ pthread_mutex_unlock(&m1); pthread_mutex_unlock(&m2); }} Graph representation (“wait-for” graph) for the entire process draw an arrow from a mutex you are
ECE391- Computer System Engineering University of Illinois at Urbana- Champaign Fall 2021 Lecture 17 Processes Announcements • MP3 • Checkpoint 1: 5:59PM on Tuesday 10/19 • Exam 2 • 10/28/2021, 7-9 PM, ECEB 1002 • Conflicts by 10/22/2021 • No Class 10/28/2021 Virtualization • Virtualization is the process of creating a software- based, or virtual,
CS代考 ECE391- Computer System Engineering Read More »
More on Thread-Safe and Synchronization Strategies and Problems Shuaiwen Clarification from the previous lectures 2 Waitpid () What is the output of the program on the left? A. acbc B. bcac C. abcc D. bacc E. AorCorD void main() { if (fork() == 0) { printf(“a”); } else { printf(“b”); waitpid(-1, NULL, 0); } printf(“c”);
CS代考 More on Thread-Safe and Synchronization Strategies and Problems Read More »
Operating Systems – CSCI 402 OS Components App App Applications OS Processor Management Memory Management I/O Management 24 321 0 Copyright ý . Systems – CSCI 402 A Simple System: To Be Discussed What is the functionality of the components? What are the key data structures? What mechanisms are there to support the applications? How
IT代考 Operating Systems – CSCI 402 Read More »