SOFT3410 Tutorial 2 Standard Library, Files and Function Pointers Question 1: Files You are able to access files on your system through C’s standard library functions and types. The FILE type is a portable abstraction for interfacing with files and streams on your system. Once opened,youcanusefunctionslikefwrite, fgets, fread, fputs, …toreadorwrite. int main() { FILE* f […]
Chapter 1: Introduction Fall 2020 Cp 633 Slide #3-* Chapter 3: Foundational Results Decidability We will use only sections 3.1 and 3.2 Cp 633 * Fall 2020 Cp 633 Slide #3-* Overview We consider access control matrix without own and copy rights and assume only mono-operational protection commands. We consider generic right r. We assume
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System Calls A trap is a type of “software interrupt” interrupt handler will invoke trap handler prog( ) { … write(fd, buffer, size); … }} User Kernel intr_handler(intr_code) { … if (intr_code == SYSCALL) syscall_handler( ); … } syscall_handler(trap_code) { … if (trap_code == write_code) write_handler( ); … } trap(write_code); … User Stack Operating Systems
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OS and Unix Overview CSci4061: Introduction to Operating Systems September 9, 2021 Computer Science & Engineering, University of Minnesota 1 Some announcements • Another TA: , Lab 24 • • 11:00am-noon Fridays • Per the department, facial shield in not considered a mask • In-class quizzes: Kahoot! • Need a permission number? • Contact for
Process States CSci4061: Introduction to Operating Systems September 21, 2021 Computer Science & Engineering, University of Minnesota 1 Announcements • Project 1 to release today • Topic: Creating processes using fork/exec/wait, according to a dependency graph • Objectives • Brush up ‘C’ programming skills • Use Makefile to build programs • Setting up the project
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SOFT3410 Tutorial 6 Processes and Synchronisation 1 Question 1: Forking processes UNIX systems use the fork() system call to allow existing processes to create new ones. The new process created by fork is called the child process, its creator is the parent process. fork is called once, but returns different values depending on which process
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a file object represents an opened file a file descriptor is simply an index to this array Whenever a process requests a new file descriptor, the lowest numbered file descriptor not already associated with an open file is selected; thus #include #include … close(0); fd = open(“file”, O_RDONLY); the above will always associate “file” with
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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
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SOFT3410 Tutorial 4 Measuring and Graphing We will be looking into performance analysis of applications. We are mostly concerned with the cpu usage but we will check out memory usage. Question 1: Time Command To get a rough idea of the real time implications of our application, we can utilise a unix command to run
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Threads CSci4061: Introduction to Operating Systems September 23, 2021 Computer Science & Engineering, University of Minnesota 1 Project 1 and grouping • Project 1 has been released • Mainly about processes • Start it early • Still looking for group members? Use Canvas 2 Questions for lectures, labs, and projects • Canvas is the best
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