Question 1

How to use async.Future and Promise for asynchronous tasks in Go?

Accepted Answer

Create a Promise to set a value asynchronously, which completes a Future. Use Future's Get() method to block until the value is available, similar to patterns in languages like Java or JavaScript, as shown in the examples directory.

Question 2

Is async.SharedMap better than sync.Map for high concurrency?

Accepted Answer

Async.SharedMap shards data to reduce lock contention, making it more performant under heavy concurrent access. However, sync.Map is simpler and sufficient for many use cases, so benchmark based on your workload.

Question 3

How does async.Executor compare to using goroutines directly?

Accepted Answer

Async.Executor manages a worker pool with controlled goroutine spawning and returns Futures for results, offering better resource management and task tracking than manually managing goroutines, but adds overhead for simple tasks.

Question 4

What's the difference between async.Once and sync.Once in Go?

Accepted Answer

Async.Once supports error handling by allowing the Do method to return an error, while sync.Once does not. This makes async.Once more flexible for functions that might fail during initialization.

Question 5

Best practices for using async.CyclicBarrier in concurrent applications?

Accepted Answer

Use CyclicBarrier to synchronize goroutines at common points; ensure all participating goroutines call Await() and handle reuse for multiple phases. Refer to the test files for implementation examples to avoid deadlocks.

Question 6

Async package vs other Go concurrency libraries like golang.org/x/sync?

Accepted Answer

Async focuses on providing additional primitives like maps, futures, and specialized locks, while golang.org/x/sync offers utilities like errgroup and semaphore. Choose based on whether you need advanced data structures or higher-level coordination patterns.

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