Deadlock and Starvation are two issues that can occur in computer systems, particularly in the context of concurrent processes and resource management.
Deadlock occurs in a system when a set of processes are each waiting for a resource held by another process in the set, causing all of them to be stuck in a state of waiting with no progress being made. For instance, imagine two processes: Process A and Process B. Process A holds Resource 1 and needs Resource 2 to continue, while Process B holds Resource 2 and needs Resource 1 to proceed. Neither process can continue because they are each waiting for the other to release a resource, leading to a cycle of dependencies with no process able to move forward. Deadlocks can be avoided or managed through techniques such as resource allocation graphs, deadlock detection algorithms, or using protocols like Banker's algorithm.
Starvation
Starvation occurs when a process is perpetually denied the resources it needs for execution because other processes are continuously allocated these resources. This problem can arise from improper scheduling or resource allocation policies. For example, in a priority-based scheduling system, if high-priority processes continuously arrive, lower-priority processes may never get a chance to execute. This is because the system always prioritizes the high-priority processes, leading to the lower-priority ones being indefinitely postponed. Starvation can be mitigated through techniques such as aging, where the priority of a process is gradually increased the longer it waits, ensuring that eventually, it gets the resources it needs.
Both deadlock and starvation are critical concerns in system design. Deadlock represents a state of complete standstill in resource usage, while starvation indicates an unfair allocation of resources leading to some processes never completing. Proper system design and management strategies are essential to avoid or resolve these issues, ensuring efficient and fair resource utilization.
