Concurrent Programming: Algorithms, Principles, and Foundations
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1 Concurrent Programming: Algorithms, Principles, and Foundations Algorithms, Principles, and Foundations Bearbeitet von Michel Raynal 1. Auflage Buch. xxxii, 516 S. Hardcover ISBN Format (B x L): 15,5 x 23,5 cm Gewicht: 979 g Weitere Fachgebiete > EDV, Informatik > Programmiersprachen: Methoden > Funktionale, logische, parallele und visuelle Programmierung Zu Leseprobe schnell und portofrei erhältlich bei Die Online-Fachbuchhandlung beck-shop.de ist spezialisiert auf Fachbücher, insbesondere Recht, Steuern und Wirtschaft. Im Sortiment finden Sie alle Medien (Bücher, Zeitschriften, CDs, ebooks, etc.) aller Verlage. Ergänzt wird das Programm durch Services wie Neuerscheinungsdienst oder Zusammenstellungen von Büchern zu Sonderpreisen. Der Shop führt mehr als 8 Millionen Produkte.
2 Contents Part I Lock-Based Synchronization 1 The Mutual Exclusion Problem Multiprocess Program The Concept of a Sequential Process The Concept of a Multiprocess Program Process Synchronization Processors and Processes Synchronization Synchronization: Competition Synchronization: Cooperation The Aim of Synchronization Is to Preserve Invariants The Mutual Exclusion Problem The Mutual Exclusion Problem (Mutex) Lock Object Three Families of Solutions Summary Bibliographic Notes Solving Mutual Exclusion Mutex Based on Atomic Read/Write Registers Atomic Register Mutex for Two Processes: An Incremental Construction A Two-Process Algorithm Mutex for n Processes: Generalizing the Previous Two-Process Algorithm Mutex for n Processes: A Tournament-Based Algorithm A Concurrency-Abortable Algorithm xi
3 xii Contents A Fast Mutex Algorithm Mutual Exclusion in a Synchronous System Mutex Based on Specialized Hardware Primitives Test&Set, Swap and Compare&Swap From Deadlock-Freedom to Starvation-Freedom Fetch&Add Mutex Without Atomicity Safe, Regular and Atomic Registers The Bakery Mutex Algorithm A Bounded Mutex Algorithm Summary Bibliographic Notes Exercises and Problems Lock-Based Concurrent Objects Concurrent Objects Concurrent Object Lock-Based Implementation A Base Synchronization Object: the Semaphore The Concept of a Semaphore Using Semaphores to Solve the Producer-Consumer Problem Using Semaphores to Solve a Priority Scheduling Problem Using Semaphores to Solve the Readers-Writers Problem Using a Buffer to Reduce Delays for Readers and Writers A Construct for Imperative Languages: the Monitor The Concept of a Monitor A Rendezvous Monitor Object Monitors and Predicates Implementing a Monitor from Semaphores Monitors for the Readers-Writers Problem Scheduled Wait Operation Declarative Synchronization: Path Expressions Definition Using Path Expressions to Solve Synchronization Problems A Semaphore-Based Implementation of Path Expressions Summary Bibliographic Notes Exercises and Problems
4 Contents xiii Part II On the Foundations Side: The Atomicity Concept 4 Atomicity: Formal Definition and Properties Introduction Computation Model Processes and Operations Objects Histories Sequential History Atomicity Legal History The Case of Complete Histories The Case of Partial Histories Object Composability and Guaranteed Termination Property Atomic Objects Compose for Free Guaranteed Termination Alternatives to Atomicity Sequential Consistency Serializability Summary Bibliographic Notes Part III Mutex-Free Synchronization 5 Mutex-Free Concurrent Objects Mutex-Freedom and Progress Conditions The Mutex-Freedom Notion Progress Conditions Non-blocking with Respect to Wait-Freedom Mutex-Free Concurrent Objects The Splitter: A Simple Wait-Free Object from Read/Write Registers A Simple Obstruction-Free Object from Read/Write Registers A Remark on Compare&Swap: The ABA Problem A Non-blocking Queue Based on Read/Write Registers and Compare&Swap A Non-blocking Stack Based on Compare&Swap Registers A Wait-Free Stack Based on Fetch&Add and Swap Registers
5 xiv Contents 5.3 Boosting Obstruction-Freedom to Stronger Progress in the Read/Write Model Failure Detectors Contention Managers for Obstruction-Free Object Implementations Boosting Obstruction-Freedom to Non-blocking Boosting Obstruction-Freedom to Wait-Freedom Mutex-Freedom Versus Loops Inside a Contention Manager Operation Summary Bibliographic Notes Exercises and Problems Hybrid Concurrent Objects The Notion of a Hybrid Implementation Lock-Based Versus Mutex-Free Operation: Static Hybrid Implementation Contention Sensitive (or Dynamic Hybrid) Implementation The Case of Process Crashes A Static Hybrid Implementation of a Concurrent Set Object Definition and Assumptions Internal Representation and Operation Implementation Properties of the Implementation Contention-Sensitive Implementations Contention-Sensitive Binary Consensus A Contention Sensitive Non-blocking Double-Ended Queue The Notion of an Abortable Object Concurrency-Abortable Object From a Non-blocking Abortable Object to a Starvation-Free Object Summary Bibliographic Notes Exercises and Problems Wait-Free Objects from Read/Write Registers Only A Wait-Free Weak Counter for Infinitely Many Processes A Simple Counter Object Weak Counter Object for Infinitely Many Processes A One-Shot Weak Counter Wait-Free Algorithm Proof of the One-Shot Implementation A Multi-Shot Weak Counter Wait-Free Algorithm
6 Contents xv 7.2 Store-Collect Object Store-Collect Object: Definition An Adaptive Store-Collect Implementation Proof and Cost of the Adaptive Implementation Fast Store-Collect Object Fast Store-Collect Object: Definition A Fast Algorithm for the store collectðþ Operation Proof of the Fast Store-Collect Algorithm Summary Bibliographic Notes Problem Snapshot Objects from Read/Write Registers Only Snapshot Objects: Definition Single-Writer Snapshot Object An Obstruction-Free Implementation From Obstruction-Freedom to Bounded Wait-Freedom One-Shot Single-Writer Snapshot Object: Containment Property Single-Writer Snapshot Object with Infinitely Many Processes Multi-Writer Snapshot Object The Strong Freshness Property An Implementation of a Multi-Writer Snapshot Object Proof of the Implementation Immediate Snapshot Objects One-Shot Immediate Snapshot Object: Definition One-Shot Immediate Snapshot Versus One-Shot Snapshot An Implementation of One-Shot Immediate Snapshot Objects A Recursive Implementation of a One-Shot Immediate Snapshot Object Summary Bibliographic Notes Problem
7 xvi Contents 9 Renaming Objects from Read/Write Registers Only Renaming Objects The Base Renaming Problem One-Shot Renaming Object Adaptive Implementations A Fundamental Result Long-Lived Renaming Non-triviality of the Renaming Problem A Splitter-Based Optimal Time-Adaptive Implementation A Snapshot-Based Optimal Size-Adaptive Implementation A Snapshot-Based Implementation Proof of the Implementation Recursive Store-Collect-Based Size-Adaptive Implementation A Recursive Renaming Algorithm An Example Proof of the Renaming Implementation Variant of the Previous Recursion-Based Renaming Algorithm A Renaming Implementation Based on Immediate Snapshot Objects An Example of a Renaming Execution Long-Lived Perfect Renaming Based on Test&Set Registers Perfect Adaptive Renaming Perfect Long-Lived Test&Set-Based Renaming Summary Bibliographic Notes Exercises and Problems Part IV The Transactional Memory Approach 10 Transactional Memory What Are Software Transactional Memories Transactions = High-Level Synchronization At the Programming Level STM System Speculative Executions, Commit and Abort of a Transaction An STM Consistency Condition: Opacity An STM Interface Incremental Reads and Deferred Updates
8 Contents xvii Read-Only Versus Update Transactions Read Invisibility A Logical Clock-Based STM System: TL Underlying System and Control Variables of the STM System Underlying Principle: Consistency with Respect to Transaction Birth Date The Implementation of an Update Transaction The Implementation of a Read-Only Transaction A Version-Based STM System: JVSTM Underlying and Control Variables of the STM System The Implementation of an Update Transaction The Implementation of a Read-Only Transaction A Vector Clock-Based STM System The Virtual World Consistency Condition An STM System for Virtual World Consistency The Algorithms Implementing the STM Operations Summary Bibliographic Notes Exercises and Problems Part V On the Foundations Side: From Safe Bits to Atomic Registers 11 Safe, Regular, and Atomic Read/Write Registers Safe, Regular, and Atomic Registers Reminder: The Many Faces of a Register From Regularity to Atomicity: A Theorem A Fundamental Problem: The Construction of Registers Two Very Simple Bounded Constructions Safe/Regular Registers: From Single-Reader to Multi-Reader Binary Multi-Reader Registers: From Safe to Regular From Bits to b-valued Registers From Safe Bits to b-valued Safe Registers From Regular Bits to Regular b-valued Registers From Atomic Bits to Atomic b-valued Registers
9 xviii Contents 11.4 Three Unbounded Constructions SWSR Registers: From Unbounded Regular to Atomic Atomic Registers: From Unbounded SWSR to SWMR Atomic Registers: From Unbounded SWMR to MWMR Summary Bibliographic Notes From Safe Bits to Atomic Bits: Lower Bound and Optimal Construction A Lower Bound Theorem Two Preliminary Lemmas The Lower Bound Theorem A Construction of an Atomic Bit from Three Safe Bits Base Architecture of the Construction Underlying Principle and Signaling Scheme The Algorithm Implementing the Operation R:writeðÞ The Algorithm Implementing the Operation R:readðÞ Cost of the Construction Proof of the Construction of an Atomic Bit A Preliminary Theorem Proof of the Construction Summary Bibliographic Notes Exercise Bounded Constructions of Atomic b-valued Registers Introduction A Collision-Free (Pure Buffers) Construction Internal Representation of the Atomic b-valued Register R Underlying Principle: Two-Level Switch to Ensure Collision-Free Accesses to Buffers The Algorithms Implementing the Operations R:writeðÞ and R:readðÞ Proof of the Construction: Collision-Freedom Correctness Proof A Construction Based on Impure Buffers Internal Representation of the Atomic b-valued Register R
10 Contents xix An Incremental Construction The Algorithms Implementing the Operations R:writeðÞ and R:readðÞ Proof of the Construction From SWSR to SWMR b-valued Atomic Register Summary Bibliographic Notes Part VI On the Foundations Side: The Computability Power of Concurrent Objects (Consensus) 14 Universality of Consensus Universal Object, Universal Construction, and Consensus Object Universal (Synchronization) Object and Universal Construction The Notion of a Consensus Object Inputs and Base Principles of Universal Constructions The Specification of the Constructed Object Base Principles of Universal Constructions An Unbounded Wait-Free Universal Construction Principles and Description of the Construction Proof of the Construction Non-deterministic Objects Wait-Freedom Versus Bounded Wait-Freedom A Bounded Wait-Free Universal Construction Principles of the Construction Proof of the Construction Non-deterministic Objects From Binary Consensus to Multi-Valued Consensus A Construction Based on the Bit Representation of Proposed Values A Construction for Unbounded Proposed Values Summary Bibliographic Notes Exercises and Problems The Case of Unreliable Base Objects Responsive Versus Non-responsive Crash Failures SWSR Registers Prone to Crash Failures Reliable Register When Crash Failures Are Responsive: An Unbounded Construction
11 xx Contents Reliable Register When Crash Failures Are Responsive: A Bounded Construction Reliable Register When Crash Failures Are Not Responsive: An Unbounded Construction Consensus When Crash Failures Are Responsive: A Bounded Construction The Parallel Invocation Approach Does Not Work A t-tolerant Wait-Free Construction Consensus When Crash Failures Are Not Responsive: An Impossibility Omission and Arbitrary Failures Object Failure Modes Simple Examples Graceful Degradation Fault-Tolerance Versus Graceful Degradation Summary Bibliographic Notes Exercises and Problems Consensus Numbers and the Consensus Hierarchy The Consensus Number Notion Fundamentals Schedule, Configuration, and Valence Bivalent Initial Configuration The Weak Wait-Free Power of Atomic Registers The Consensus Number of Atomic Read/Write Registers Is The Wait-Free Limit of Atomic Registers Objects Whose Consensus Number Is Consensus from Test&Set Objects Consensus from Queue Objects Consensus from Swap Objects Other Objects for Wait-Free Consensus in a System of Two Processes Power and Limit of the Previous Objects Objects Whose Consensus Number Is þ Consensus from Compare&Swap Objects Consensus from Mem-to-Mem-Swap Objects Consensus from an Augmented Queue From a Sticky Bit to Binary Consensus Impossibility Result
12 Contents xxi 16.6 Hierarchy of Atomic Objects From Consensus Numbers to a Hierarchy On Fault Masking Robustness of the Hierarchy Summary Bibliographic Notes Exercises and Problems The Alpha(s) and Omega of Consensus: Failure Detector-Based Consensus De-constructing Compare&Swap A Liveness-Oriented Abstraction: The Failure Detector X Definition of X X-Based Consensus: X as a Resource Allocator or a Scheduler Three Safety-Oriented Abstractions: Alpha 1, Alpha 2, and Alpha A Round-Free Abstraction: Alpha A Round-Based Abstraction: Alpha Another Round-Free Abstraction: Alpha The Rounds Seen as a Resource X-Based Consensus Consensus from Alpha 1 Objects and X Consensus from an Alpha 2 Object and X Consensus from an Alpha 3 Object and X When the Eventual Leader Elected by X Does Not Participate The Notion of an Indulgent Algorithm Consensus Object Versus X Wait-Free Implementations of the Alpha 1 and Alpha 2 Abstractions Alpha 1 from Atomic Registers Alpha 2 from Regular Registers Wait-Free Implementations of the Alpha 2 Abstraction from Shared Disks Alpha 2 from Unreliable Read/Write Disks Alpha 2 from Active Disks Implementing X The Additional Timing Assumption EWB An EWB-Based Implementation of X Proof of the Construction Discussion
13 xxii Contents 17.8 Summary Bibliographic Notes Exercises and Problems Afterword Bibliography Index
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