Concurrent Processes

• Activation of one or more processes at the same time.
• Two types of concurrency normally discussed :
  Apparent or Pseudo Concurrency : A single hardware processor is switched between processes by interleaving.
  
  Over a period of time this gives the illusion of concurrent execution of the processes.
  
  Real Concurrency : Multiple hardware processors are present in the machine, and the OS can schedule tasks onto the processors.
  
  Usually, processors are much less than the number of processes.