Thread:
- Thread is nothing but functionality which could be executed simultaneously with the other part of the program based on the concept of one with another.
- But where as method or a function which would be executed hierarchically with the other part of the program.
- It is termed as a ‘lightweight process’, since it is similar to a real process but executes within the context of a process and shares the same resources allotted to the process by the kernel
- A program which is under execution can be called as process.
- Some operating systems use the term ‘task‘ to refer to a program that is being executed.
- Thread is part of the process.
- Both processes and threads are independent sequences of execution. The typical difference is that threads (of the same process) run in a shared memory space, while processes run in separate memory spaces.
- I'm not sure what "hardware" vs "software" threads might be referring to. Threads are an operating environment feature, rather than a CPU feature (though the CPU typically has operations that make threads efficient).
- Threads share the address space of the process that created it; processes have their own address space.
- Threads have direct access to the data segment of its process; processes have their own copy of the data segment of the parent process.
- Threads can directly communicate with other threads of its process; processes must use interprocess communication to communicate with sibling processes.
- Threads have almost no overhead; processes have considerable overhead.
- A process is a collection of code, memory, data and other resources. A thread is a sequence of code that is executed within the scope of the process. You can (usually) have multiple threads executing concurrently within the same process.
- we can create threads in two ways.
- 1. Extending Thread class.
2. Implementing Runnable interface.
Extending Thread class:
package com.instanceofjavaforus;
public class ExtendsThread extends Thread {
public void run(){
System.out.println("thread is running...");
}
public static void main(String args[]){
ExtendsThread t1=new ExtendsThread();
t1.start();
}
}
Implementing Runnable interface
package com.instanceofjavaforus;
public class RunnabelDemo implements Runnable{
public void run(){
System.out.println("thread is running...");
}
public static void main(String args[]){
RunnabelDemo m1=new RunnabelDemo();
Thread t1 =new Thread(m1);
t1.start();
}
}
Best Practices for Multithreading
- Avoid Deadlocks: Ensure that threads acquire locks in a consistent order.
- Use Thread Pools: Prefer ExecutorService over manually creating threads.
- Minimize Synchronization: Synchronize only the critical sections of your code.
- Use Volatile Variables: Use the volatile keyword for variables that are accessed by multiple threads.
- Handle Exceptions: Always handle exceptions in threads to avoid unexpected crashes.
- java is a powerhouse application that allows programmers to make their applications be able to do multiple tasks at once in essence.Multithreading means that software to the server, is fast; but it also takes advantage of my computer and yours too for performance.It also means that Multithreading allows you to have parallelism between different programs on one machine: from where they run off more than one CPU core all the time--thus increasing efficiency even further than just using performance of one set plus productivity when running together concurrently.In this blog post, we’ll look at how to create threads and use the new C++ STD standard mutex with graphicsexamples. We will also discuss good programming practice; indeed it is essential for multithreading operations in today’s fast-paced development environment.
What are Threads?
Multithreading allows the execution of multiple threads by a CPU (or the threading of a single core in multi-core processors), and it provides the possibility to interrupt any running thread at all times whether this one happens to be currently blocked for some reason on I/O operations or not at all A thread is smallest unit that can be independently run within a process. In Java, multithreading allows you to run many threads at the same time--and indeed most of them might finish quickly so they won't need any additional waiting for message processing or other future work which is not needed now that so many jobs have been done.
Why Multithreading?
Performance Improved: Because tasks are split into several threads you can take better advantage of the resources inside your CPU.
Responsiveness: Even if your program performs a lot of time-consuming tasks, it remains responsive.
Data Sharing: Threads share information and states--so this makes it easier to exchange data between them.
Background Tasks: Multithreading allows you to execute non-blocking operations in the main thread.
Really a great post. I learned lots of things about Java.
ReplyDeleteJava Training in Chennai
Nice post. I have been reading a lot of stuff on this topic in the last few months, but this article stands out with its simplicity & authenticity. Every passage made profound sense. Thanks a lot for this.
ReplyDelete