ECS 150 – Concurrency and threads Prof. Joël Porquet-Lupine UC Davis – 2020/2021 Copyright © 2017-2021 Joël Porquet-Lupine – CC BY-NC-SA 4.0 International License / 1 / 33 Concurrency Definition Concurrency is the composition of independently executing tasks Tasks can start, run, complete in overlapping time periods Opposite to sequential execution Process concurrency Decompose complex […]
ECS 150: Project #3 – File system Prof. Joël Porquet-Lupine UC Davis, Winter Quarter 2021 Changelog General information Objectives of the project Program description Introduction Constraints Assessment The ECS150-FS specifications Superblock FAT Root directory Formatting program Reference program and testing Suggested work phases Phase 0: Skeleton code Phase 1: Mounting/unmounting Phase 2: File creation/deletion Phase 3:
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ECS 150 – System Calls Prof. Joël Porquet-Lupine UC Davis – 2020/2021 Copyright © 2017-2021 Joël Porquet-Lupine – CC BY-NC-SA 4.0 International License / 1 / 43 C Standard Library C program example Execution #include #include … int main(int argc, char *argv[]) { int fd; char buf[4]; if (argc < 2) exit(EXIT_FAILURE); memset(buf, 0, sizeof(buf));
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ECS 150 – Project 3 Prof. Joël Porquet-Lupine UC Davis – 2020/2021 Copyright © 2017-2021 Joël Porquet-Lupine – CC BY-NC-SA 4.0 International License 1 / 34 Goal Implement support for a very simple filesystem: ECS150-FS API for applications to read/write files from/to this filesystem /* Mounting filesystem */ int fs_mount(const char *diskname); int fs_umount(void); int
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ECS 150 – Project 2 Prof. Joël Porquet-Lupine UC Davis – 2020/2021 Copyright © 2017-2021 Joël Porquet-Lupine – CC BY-NC-SA 4.0 International License / 1 / 17 Organization Assignment Assignment released today Due in two weeks: Feb 12th Two parts Queue API User-level thread library Teamwork Two options: 1. Keep the same partner as P1
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ECS 150 – GDB tutorial Prof. Joël Porquet-Lupine UC Davis – 2020/2021 Copyright © 2017-2021 Joël Porquet-Lupine – CC BY-NC-SA 4.0 International License / 1 / 24 GDB GNU project Started by Richard Stallman in 1983 Free software, mass collaboration project in response to proprietary UNIX Copyleft license: GNU GPL User programs: text editor (Emacs),
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ECS 150 – Deadlocks Prof. Joël Porquet-Lupine UC Davis – 2020/2021 Copyright © 2017-2021 Joël Porquet-Lupine – CC BY-NC-SA 4.0 International License / 1 / 27 Deadlock examples Real-life deadlock 2 / 27 / Deadlock examples Mutually recursive locking void thread1(void) { lock(lock1); lock(lock2); … /* computation */ … unlock(lock2); unlock(lock1); } void thread2(void) {
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/** * list data structure containing the tasks in the system */ #include “task.h” struct node { Task *task; struct node *next; }; // insert and delete operations. void insert(struct node **head, Task *task); void delete(struct node **head, Task *task); void traverse(struct node *head);
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ECS 150: Project #1 – Simple Shell Prof. Joël Porquet-Lupine UC Davis, Winter Quarter 2021 Changelog General information Objectives of the project Program description Introduction Constraints Assessment The sshell specifications Commands and command line Builtin commands Output redirection Piping Error management Extra features Reference program and testing Suggested work phases Phase 0: preliminary work Phase 1:
ECS 150: Project #3 – File system Prof. Joël Porquet-Lupine UC Davis, Winter Quarter 2021 Changelog General information Objectives of the project Program description Introduction Constraints Assessment The ECS150-FS specifications Superblock FAT Root directory Formatting program Reference program and testing Suggested work phases Phase 0: Skeleton code Phase 1: Mounting/unmounting Phase 2: File creation/deletion Phase 3:
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