What is it?

-> A thread is a light-weight sub-process, the smallest unit of processing

-> Also defined as unit of execution within a [[Processes]]

-> Multiprocessing and multithreading, both are used to achieve multitasking

Threads use a #Shared_Memory area. They dont allocate separate memory area so saves memory and context switching between the threads takes less time than process.

Different types of threads

There are two types of threads in an application - user thread and daemon thread When we start an application, the main is the first user thread created. When all the user threads are executed, #JVM terminates the program.

#Thread_Priority

When we create a thread, we can assign its priority.

We can set different priorities to different threads but it doesnt guarantee that a higher priority thread will execute first than a lower priority thread

The #thread_scheduler is the part of Operating System implementation and when a thread is started, its execution is controlled by Thread Scheduler and JVM doesnt have any control over its execution.

Threads exist within a [[Processes]] - every process has at least one.