Give some stream of consciousness and then the answer. Context: A process transitions to a blocked state when it can not carry on without an external change in state or event occurring. For example, a process may block on a call to an I / O device such as a printer, if the printer is not available. Processes also commonly block when they require user input, or require access to a critical section which must be executed atomically. Such critical sections are protected using a synchronization object such as a semaphore or mutex.\n\nQuestion: when does a process enters a blocked state?
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The relevant information to answer the above question is: A process transitions to a blocked state when it can not carry on without an external change in state or event occurring.
Therefore, the answer is when it can not carry on without an external change in state or event occurring.
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