What is wait-free in concurrency?

Wait-free is a stronger condition which means that every thread is guaranteed to make progress over an arbitrary period of time, regardless of the timing/ordering of thread execution; and so we can say that the threads finish independently.

Does wait-free imply lock-free?

Intuitively, lock-free means that some process is always guaranteed to make progress by completing its operations within a finite number of system steps, while wait-free means that each process completes its operations within a finite number of its own steps.

What is lock-free structure?

A lock-free data structure can be used to improve performance. A lock-free data structure increases the amount of time spent in parallel execution rather than serial execution, improving performance on a multi-core processor, because access to the shared data structure does not need to be serialized to stay coherent.

What is lock-free in Java?

In a multi-threaded environment, the lock-free algorithms provide a way in which threads can access the shared resources without the complexity of Locks and without blocking the threads forever. These algorithms become a programmer’s choice as they provide higher throughput and prevent deadlocks.

What is a lock-free queue?

Lock-free queue is a queue applying to concurrency but without locking. When using lock-free queue, slow or stopped processes do not prevent other processes from accessing data in it. Lock-free queue has two main interfaces just like normal queue: Enqueue.

Is ConcurrentLinkedQueue thread safe?

Class ConcurrentLinkedQueue An unbounded thread-safe queue based on linked nodes. This queue orders elements FIFO (first-in-first-out). The head of the queue is that element that has been on the queue the longest time.

Is STD atomic lock-free?

std::atomic::is_lock_free Checks whether the atomic operations on all objects of this type are lock-free.

Is atomic lock-free?

atomic variables don’t use locks (at least where T is natively atomic on your platform), but they’re not lock-free in the sense above. You might use them in the implementation of a lock-free container, but they’re not sufficient on their own.

What is Mpmc queue?

According to the classification it’s MPMC, array-based, fails on overflow, does not require GC, w/o priorities, causal FIFO, blocking producers and consumers queue. The algorithm is pretty simple and fast. It’s not lockfree in the official meaning, just implemented by means of atomic RMW operations w/o mutexes.

Is ConcurrentLinkedQueue blocked?

Unlike a LinkedBlockingQueue, a ConcurrentLinkedQueue is a non-blocking queue. Thus, it does not block a thread once the queue is empty. Instead, it returns null. Since its unbounded, it’ll throw a java.

What is LinkedBlockingQueue used for?

LinkedBlockingQueue blocks the consumer or the producer when the queue is empty or full and the respective consumer/producer thread is put to sleep.