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OS-6

Chapter 6: Synchronization Tools

TermDefinition
Monitor type an abstract data type (ADT) that includes a set of programmer-defined operations that are provided with mutual exclusion within the monitor.
Counting Semaphore a semaphore that has a value between o and N, to control access to a resource with N instances.
Binary Semaphore a semaphore of values 0 and 1 that limits access to one resource (acting similarly to a mutex lock).
Mutex lock a mutual exclusion lock; the simplest software tool for assuring mutual exclusion.
Liveness a set of properties that a system must satisfy to ensure that processes make progress during their execution life cycle.
Deadlock the state in which two processes or threads are stuck waiting for an event that can only be caused by one of the processes or threads.
Priority Inversion a scheduling challenge arising when a higher-priority process needs to read or modify kernel data that are currently being accessed by a lower-priority process.
Priority-inheritance Protocol a protocol for solving priority inversion in which all processes that are accessing resources needed by a higher-priority process inherit that higher priority until they are finished with the resources in question.
Critical Section a section of code responsible for changing data that must only be executed by one thread or process at a time to avoid a race condition
Race Condition a situation in which two threads are concurrently trying to change the value of a variable.
Semaphore an integer variable that, apart from initialization, is accessed only through two standard atomic operations: wait() and signal().
Created by: vytalic
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