Process properties

A process in a multithreaded system is the changeable entity.

It must be considered as an execution frame. It has traditional process attributes, such as:

• Process ID, process group ID, user ID, and group ID
• Environment
• Working directory

A process also provides a common address space and common system resources, as follows:

• File descriptors
• Signal actions
• Shared libraries
• Inter-process communication tools (such as message queues, pipes, semaphores, or shared memory)