As we mentioned earlier that in many respect threads operate in the same way as that of processes. Some of the similarities and differences are:


  • Like processes threads share CPU and only one thread active (running) at a time.
  • Like processes, threads within processes, threads within processes execute sequentially.
  • Like processes, thread can create children.
  • And like process, if one thread is blocked, another thread can run.



Doesn’t share memory (loosely coupled)

Shares memories and files (tightly coupled)

Creation is time consuming


Execution slow


More time to terminate

Less time

More time to switch between processes

Less time

System calls are required for communication

Not required

more resources are required

fewer resources are required

Not suitable for parallelism