Process Synchronization And Deadlocks

Process Synchronization and Deadlocks In a nutshell

Content ,[object Object],[object Object],[object Object],[object Object],[object Object]

Why study these chapters? ,[object Object],[object Object],[object Object]

A race condition example ,[object Object],[object Object],[object Object],[object Object],[object Object]

A race condition example (2) ,[object Object],[object Object],[object Object]

A race condition example (3) ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

A race condition example (4) ,[object Object]

Critical Sections ,[object Object],[object Object],[object Object]

Critical Sections (2) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Solution to Critical-Section Problem ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Critical Section Solutions ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Critical Section Solutions ,[object Object],[object Object],[object Object],[object Object]

Some Classical Problems in Synchronization ,[object Object]

Bridge Crossing Example ,[object Object],[object Object],[object Object],[object Object],[object Object]

Deadlocks ,[object Object],[object Object]

Deadlocks ,[object Object],[object Object],[object Object],[object Object],[object Object],[object Object]

Deadlock Characterization ,[object Object],[object Object],[object Object],[object Object],[object Object],Deadlock can arise if four conditions hold simultaneously.

Resource-Allocation Graph ,[object Object],[object Object],[object Object],[object Object],[object Object],A set of vertices V and a set of edges E .

Resource-Allocation Graph (Cont.) ,[object Object],[object Object],[object Object],[object Object],P i P i R j R j

Example of a Resource Allocation Graph

Resource Allocation Graph With A Deadlock

Graph With A Cycle But No Deadlock

Basic Facts ,[object Object],[object Object],[object Object],[object Object]

Methods for Handling Deadlocks ,[object Object],[object Object],[object Object]

Deadlock Prevention ,[object Object],[object Object],[object Object],[object Object],Restrain the ways request can be made.

Deadlock Prevention (Cont.) ,[object Object],[object Object],[object Object],[object Object],[object Object]

Deadlock Avoidance ,[object Object],[object Object],[object Object],Requires that the system has some additional a priori information available.

Useful Resources ,[object Object],[object Object]

Process Synchronization And Deadlocks

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Process Synchronization And Deadlocks