DIFFERENT BETWEEN MULTI-TASKING AND MULTI-THREADING

MULTITASKING

  • In multitasking, more than one program resides in the main memory and is executed simultaneously with a single CPU.
  • Different tasks may be from different users.
  • There are called heavyweight processes(HWP).
  • Each program or task has its own address space, it's own stack, and its own register set.
  • Each task has nothing to do with the other except that they may communicate through the system's interprocess communication primitives such as semaphores, monitors, or messages.

MULTITHREADING

  • Multi-threading is multi-tasking within a single program.
  • The individual tasks running within the same program are called threads.
  • These are called lightweight processes (LWP).
  • All threads have exactly the same address space. Each thread runs sequentially and has its own program counter and stack.
  • Different threads in a program are not quite as different processes.