Processes have their own separate memory spaces and hold multiple threads.
Threads run in a process, share memory, and can be scheduled for execution. They have their own code, data, registers, and stack.
| Per process items | Per thread items |
|---|---|
| Address space | Program counter |
| Global variables | Registers |
| Open files | Stack |
| Child processes | State |
| Pending alarms | |
| Signals and signal handlers | |
| Accounting information |