Threads In Java part 1

Programming Language/Program (Threads)

• When a OS runs in a single processor. In runs multiples tasks such as Notepad, IE, MS-Word, Windows Explorer, Command Prompt etc. in a simultaneous manner. Because of single processor embeded in a single chip runs only one task at a time, in OS multiple tasks runs simultaneously which is managed by multi-tasking engine of the OS.
• Multi-tasking engines runs multiple tasks in 3 different models: round-robin mode, weight based model and priority model.
• This is how we call OS as multi-tasking OS. If single IC consists of multiple processors, then OS can runs multiple tasks on multiple processors running in a single IC.
• This is called as multi-processing.
• In brief multiple jobs running on a single chip on multiple processors is multi-processing.
• Multiple jobs run by a OS simultaneously on a single chip or parallelly when multiple processors exist is called as multi-tasking.
• When a command prompt is opened and on the command prompt when we run java command. It is one of task of OS.
• The java command runs JVM that loads our java program and from the single java program when we run multiple jobs then they are called as multiple threads.
• It means threads are subset of tasks, tasks are subset of process.

Tasks are controlled by OS, threads can be controlled from a java program independent of OS. This is how we can call threads as light weight (independent) process from the OS.

Threads are light-weight, controllable flow of executions in a Java program.

Originally published at https://techchannelwithdsk.blogspot.com.