Threads And Concurrency Questions
Deadlocks can be prevented by implementing one or more of the following techniques:
1. Mutual Exclusion: Ensure that resources can only be accessed by one thread at a time. This can be achieved by using locks or semaphores to enforce exclusive access.
2. Hold and Wait: Avoid situations where a thread holds a resource while waiting for another resource. One way to achieve this is by implementing a policy where a thread must acquire all required resources before starting execution.
3. No Preemption: Do not allow resources to be forcibly taken away from a thread. This means that a thread cannot be interrupted or have its resources forcibly released by another thread.
4. Circular Wait: Avoid circular dependencies by imposing a total ordering of resources. This can be done by assigning a unique identifier to each resource and ensuring that threads always request resources in a specific order.
By implementing these techniques, the occurrence of deadlocks can be minimized or completely prevented.