Data Structures And Abstractions With Java 3rd Edition Pdf Free 22
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The course then explores the concept of a thread-local variable. To understand thread-local variables, it is helpful to understand that Java's threads are a managed abstraction, in that the JVM is in charge of managing them. By default, the JVM is nearly free of managing any threads, although a few low-level concepts do exist in the runtime that are used to facilitate some thread management, such as the concept of a thread group. Thread-local variables can be used to pass non-local variables between threads in a thread group, but they are not necessary. This topic also discusses the ThreadLocal class, which provides thread-local variables and thread-local variable access methods.
The next topic covers the concept of a stack, which is the area in memory where thread-local variables are located. The stack pointer indicates the location on the stack where the next item to be pushed onto the stack is to be stored. The thread pointer indicates the location on the stack where the current thread's data is stored.
The course's main discussion starts with the topic of threading and an overview of the threading model in Java. The course then explores the concept of an execution thread, which is a thread that runs the Java Virtual Machine (JVM), plus the concept of an OS thread, which is a thread that runs the operating system. A program can contain one or more virtual machine threads, plus one or more operating system threads. The operating system threads are the threads that execute the operating system's instructions. A JVM may have zero or more Java threads.
The course covers most of the mechanisms used by the runtime to manage threads, including threads being grouped together in a thread group, threads sharing a process, and threads sharing a native thread, called a native thread. The threadgroup concept is the most important abstraction to understand when programming with threads, as it allows multiple threads to exist in a single process in a predictable way. Processes and thread groups are also related to memory management and the garbage collector.
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