'Lock release' diaporamas de présentation

Two Phase Locking, Lecture 3 (BHG , Chap. 3)

Two Phase Locking, Lecture 3 (BHG , Chap. 3). The practical foundation. Topics. Part I: Foundations Part II: Beyond Basic Locking Part III: Degrees of Isolation Part IV: Viewing B+-tree Operations as Transactions. Part I: Foundations. Aggressive and Conservative Schedulers.

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Synchronization

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Atomicity

x. y. acq(this). t=i. i=t+1. rel(this). z. ?. ?. ?. ?. ?. ?. ?. ?. acq(this). x. t=i. y. i=t+1. z. rel(this). ?. ?. ?. ?. ?. ?. ?. ?. acq(this). x. y. t=i. i=t+1. z. rel(this). ?. ?. ?. ?. ?. ?. ?. ?. Atomicity.

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Atomicity

x. y. acq(this). t=i. i=t+1. rel(this). z. ?. ?. ?. ?. ?. ?. ?. ?. acq(this). x. t=i. y. i=t+1. z. rel(this). ?. ?. ?. ?. ?. ?. ?. ?. acq(this). x. y. t=i. i=t+1. z. rel(this). ?. ?. ?. ?. ?. ?. ?. ?. Atomicity.

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CS510 Concurrent Systems

CS510 Concurrent Systems. Introduction to Concurrency. Why is Concurrency Important?. Scaling up vs scaling out Concurrent hardware vs concurrent software. Sequential Programming with Processes. What is a Process? Private memory a program data stack heap CPU context

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Symmetric Multiprocessors and Performance of SpinLock Techniques

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Monitor Solutions to Classical Problems

Monitor Solutions to Classical Problems. Announcements. CS 415 Projects graded. Mean 80.7, High 90 out of 90 CS 414 Homework due Monday. Goals for Today. Continue with Synchronization Abstractions Monitors and condition variables Producer Consumer with Monitors

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Summarizing Procedures in Concurrent Programs

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CS 3214 Computer Systems

CS 3214 Computer Systems. Godmar Back. Lecture 22. Announcements. Project 4 due Nov 10 Exercise 9 due Nov 11. MULTI-THREADING. Coordinating Multiple Threads. Aside from coordinating access to shared items, threads may need to communicate about events

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Lecture Topics: 11/6

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Making a DSM Consistency Protocol Hierarchy-Aware: An Efficient Synchronization Scheme

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The Need for Synchronization

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Lecture Topics: 11/6

Lecture Topics: 11/6. More on threads Synchronization problem Too much milk Locks. Processes and Threads. A full process includes numerous things: an address space (defining all the code and data pages) OS resources and accounting information

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Simple Deadlock

Simple Deadlock. Thread A: Thread B: lock_acquire(l1); lock_acquire(l2); lock_acquire(l2); lock_acquire(l1); ... ... lock_release(l2); lock_release(l1); lock_release(l1); lock_release(l2 );. Circular Requests. P2. P4. R4. "Owned by". R2. R3. R4. R2. R3. Resource. P3. P1. P1.

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Simple Deadlock

Simple Deadlock. Thread A: Thread B: lock_acquire (l1); lock_acquire (l2); lock_acquire (l2); lock_acquire (l1); ... ... lock_release (l2); lock_release (l1); lock_release (l1); lock_release (l2 );. Circular Requests. T2. T4. R4. "Owned by". R2. R3. R4. R2. R3. Resource. T3.

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