Recall Two Uses of Semaphores Mutual Exclusion (initial value = 1) • Also called “Binary Semaphore” or “mutex”. • Can be used for mutual exclusion, just like a lock: Copyright By PowCoder代写 加微信 powcoder semaP(&mysem); // Critical section goes here semaV(&mysem); Scheduling Constraints (initial value = 0) • Allow thread 1 to wait for a […]
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INFO20003 Database Systems Dr Renata Borovica-Gajic* Lecture 17 Transactions slides adopted Week 9 from Copyright By PowCoder代写 加微信 powcoder Today’s Session… • Why we need user-defined transactions • Properties of transactions • How to use transactions • Concurrent access to data • Locking and deadlocking • Transaction recovery INFO20003 Database Systems © University of Melbourne
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Programming as Problem Solving COMP 1100/1130 Semester 1, 2021 The Australian National University Acknowledgement of Country I wish to acknowledge the traditional custodians of the land we are meeting on, the Ngunnawal people. I wish to acknowledge and respect their continuing culture and the contribution they make to the life of this city and this
project_path: /_project.yaml book_path: /_book.yaml Note: this document also lives on https://www.quoccabank.com/week0 # Getting Started Welcome to Web Application Security! This course is very practical and as such we expect you to be able to use a couple of core tools so you can get knee deep in some exercises once the trimester starts. Objective: Follow
CSE 440: Advanced Algorithms Lecture 9: Parallel Algorithms CLRS Ch. 27 Scope Our Assumptions (Model) • Multiprocessor computers • Different variants • Chip-multiprocessor • Multi-Socket computers • Clusters • Model: P processors • Shared Memory • As opposed to message passing • Sequentially Consistent • the memory behaves as if the instructions were executed sequentially
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Carleton University School of Computer Science COMP 3000 (WINTER 2021) OPERATING SYSTEMS ASSIGNMENT 3 (SOLUTIONS) Questions – part 1 [10] (File systems) The following questions (where applicable) will be based on the original 3000test.c in Tutorial 5: When the logical size is greater than the physical size, we can say the file has “holes”. Create
CS计算机代考程序代写 file system concurrency Carleton University School of Computer Science Read More »
CSCI-GA.2250-001 Operating Systems Processes and Threads Details of Lecture • Process Model • Process Creation ( fork , exec ) • Signals • Process State / Transition Models • Multi-programming • Threads OS Management of Application Execution • Resources are made available to multiple applications • A “processor” can only run one unit of execution
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COMP 3000 Operating Systems Inter-Process Communication and Concurrency (part 2) Lianying Zhao No True Shared Memory without Hardware Support • Example of hardware support: dual-ported RAM? • Still, one port is read-only • Does not solve our problem • Ideally: • The CPU architecture (hardware) provides per-purpose instructions. One instruction for everything? • In reality:
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COMP 3000 Operating Systems Facilities for Users/Programmers (part 2) Lianying Zhao Controlling Running Programs • All processes have a parent process (except init) • As a result of a fork()-like system call • The PPID of a process • Hence forming the process tree • The wait() System Call • A process must be waited
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CSE 440: Advanced Algorithms Lecture 10: Concurrent Data Structures Linearizability: ART Ch. 3 Examples (overview): ART Ch. 9, 11, 13 Chromatic Tree: https://link.springer.com/content/pdf/10.1007/s002360050057.pdf Objective • How to prove that a concurrent data structure is correct? • Relevant questions • How to implement a concurrent data structure? • How to prove that a sequential data structure
CS计算机代考程序代写 data structure database concurrency algorithm CSE 440: Advanced Algorithms Read More »