Final answer:
The condition referred to is deadlock, and it can be prevented by a strategy that requires processes to request all resources at once and blocks them until all can be granted simultaneously to avoid indefinite resource holding.
Step-by-step explanation:
The condition that can be prevented by requiring that a process request all of its required resources at one time and blocking the process until all requests can be granted simultaneously is known as deadlock. This approach is one of the strategies used in deadlock prevention. By not allowing a process to hold onto some resources while waiting for others, the system ensures that resources are not tied up indefinitely and they are allocated in a way that avoids the possibility of a deadlock occurring, where multiple processes are waiting on each other to release resources and thus none can proceed.
Requiring processes to request all of their required resources at one time and blocking until all requests can be granted simultaneously is a preventive measure against the deadlock condition. This approach contributes to the overall system's stability and ensures that resources are allocated in a way that minimizes the risk of deadlocks.