How to get the current queue name in swift 3

Question

We have function like this in swift 2.2 for printing a log message with the current running thread:

func MyLog(_ message: String) {
    if Thread.isMainThre         


        

Answer 1

Here's a wrapper class that offers some safety (revised from here):

import Foundation

/// DispatchQueue wrapper that acts as a reentrant to a synchronous queue;
/// so callers to the `sync` function will check if they are on the current
/// queue and avoid deadlocking the queue (e.g. by executing another queue
/// dispatch call). Instead, it will just execute the given code in place.
public final class SafeSyncQueue {

    public init(label: String, attributes: DispatchQueue.Attributes) {
        self.queue = DispatchQueue(label: label, attributes: attributes)
        self.queueKey = DispatchSpecificKey()
        self.queue.setSpecific(key: self.queueKey, value: QueueIdentity(label: self.queue.label))
    }

    // MARK: - API

    /// Note: this will execute without the specified flags if it's on the current queue already
    public func sync(flags: DispatchWorkItemFlags? = nil, execute work: () throws -> T) rethrows -> T {
        if self.currentQueueIdentity?.label == self.queue.label {
            return try work()
        } else if let flags = flags {
            return try self.queue.sync(flags: flags, execute: work)
        } else {
            return try self.queue.sync(execute: work)
        }
    }

    // MARK: - Private Structs

    private struct QueueIdentity {
        let label: String
    }

    // MARK: - Private Properties

    private let queue: DispatchQueue
    private let queueKey: DispatchSpecificKey

    private var currentQueueIdentity: QueueIdentity? {
        return DispatchQueue.getSpecific(key: self.queueKey)
    }

}