Everything not on exam 1 and 2

Thread

This is a flow of execution, it has light weight processes and exists within a process. It shares resources like memory and open files

Ways you can create a thread of execution

1. Write a class to extend the thread class

2. Write a class that implements a runnable interface and tap it in a thread

Processes

A self contained execution environment, has its own memory and resources

What’s the difference between start and run

start allows threads to run concurrently while the run methods directly runs the threads syncronously

Join()

When a thread joins another , it is blocked until the the thread being joined on finishes. This technique is used when your thread depends on another thread

Wait()

causes the current thread to wait until another thread invokes the notify() method or notifyall()

Notify()

Wakes up a single thread that is waiting on this objects monitor.

Notifyall()

Wakes up all the threads are waiting on this objects

Java Thresd life cycle

1. The thread constructor is called a new instance of the thread class

2. The start merges is called to designate rhe thread as runnable

3. The Java thread scheduler runs rhe thread as the processor becomes available

4. The thread can be blocked for various reasons and will not run again until it is returned to the Runnable State

5. If fhe thread calls the wait method, it is put into the waiting state and will remain their until another thread calls the notify or notify all method

6. The thread ends when the run method terminates

Deadlock

This is a scenario where two or more threads are blocked indefinitely waiting for access to a critical resource.

Socket

One endpoint of a two-way communication link between two programs running on the network

Accept()

Calling accept on the server blocks the server until a client connects to the port

What Happens when a client connects to a server

It unblocks and gets back a client socket

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