2-2 THREADS

In many situations, multiple threads of control in the same address are needed,as they will run in quasi-parallel and keep independent.

2-2-1 Thread Usage

4 Reasons for having threads

• The ability for parallel entities to share an address space and all of its data among themselves.
• Lighter weight than processes,easy to create and destory
• Computing activities overlap,speed up the application
• Multiple CPUS

Add three threads for a word processor.

One interacts with the user ,one handles reformatting in the background, the another one handle disk backups.