when a process is in a “blocked” state waiting for some i/o service. when the service is completed, it goes to the

5 hours ago 2
when a process is in a “blocked” state waiting for some i/o service. when the service is completed, it goes to the

A process is in a "blocked" state when it is waiting for some event to occur, such as the completion of an I/O operation or the availability of a resource. During this time, the process cannot execute because it is waiting for that event to finish. Once the event occurs (e.g., the I/O service completes), the process transitions from the blocked state to the ready state, where it waits to be allocated the CPU again. This "blocked" state helps optimize processor efficiency by allowing the CPU to work on other processes while the current process waits for I/O or other dependent events. It never moves directly from blocked to running; it must go through the ready state first. In summary:

  • Blocked state: Process is waiting for an event (like I/O completion).
  • After the event occurs, process moves to ready state.
  • In ready state, the process waits for CPU allocation to run.

This three-state model (running, ready, blocked) is common in operating systems to manage process execution effectively.