Merge commit '7621e2f8dec938cf48181c8b10afc9b01f444e68' into beta

submodules/SSignalKit/SwiftSignalKit/Source/Signal_Dispatch.swift

@@ -0,0 +1,122 @@
+import Foundation
+
+public func deliverOn<T, E>(_ queue: Queue) -> (Signal<T, E>) -> Signal<T, E> {
+    return { signal in
+        return Signal { subscriber in
+            return signal.start(next: { next in
+                queue.async {
+                    subscriber.putNext(next)
+                }
+            }, error: { error in
+                queue.async {
+                    subscriber.putError(error)
+                }
+            }, completed: {
+                queue.async {
+                    subscriber.putCompletion()
+                }
+            })
+        }
+    }
+}
+
+public func deliverOnMainQueue<T, E>(_ signal: Signal<T, E>) -> Signal<T, E> {
+    return signal |> deliverOn(Queue.mainQueue())
+}
+
+public func deliverOn<T, E>(_ threadPool: ThreadPool) -> (Signal<T, E>) -> Signal<T, E> {
+    return { signal in
+        return Signal { subscriber in
+            let queue = threadPool.nextQueue()
+            return signal.start(next: { next in
+                queue.addTask(ThreadPoolTask { state in
+                    if !state.cancelled.with({ $0 }) {
+                        subscriber.putNext(next)
+                    }
+                })
+            }, error: { error in
+                queue.addTask(ThreadPoolTask { state in
+                    if !state.cancelled.with({ $0 }) {
+                        subscriber.putError(error)
+                    }
+                })
+            }, completed: {
+                queue.addTask(ThreadPoolTask { state in
+                    if !state.cancelled.with({ $0 }) {
+                        subscriber.putCompletion()
+                    }
+                })
+            })
+        }
+    }
+}
+
+public func runOn<T, E>(_ queue: Queue) -> (Signal<T, E>) -> Signal<T, E> {
+    return { signal in
+        return Signal { subscriber in
+            if queue.isCurrent() {
+                return signal.start(next: { next in
+                    subscriber.putNext(next)
+                }, error: { error in
+                    subscriber.putError(error)
+                }, completed: {
+                    subscriber.putCompletion()
+                })
+            } else {
+                var cancelled = false
+                let disposable = MetaDisposable()
+                
+                disposable.set(ActionDisposable {
+                    cancelled = true
+                })
+                
+                queue.async {
+                    if cancelled {
+                        return
+                    }
+                    
+                    disposable.set(signal.start(next: { next in
+                        subscriber.putNext(next)
+                    }, error: { error in
+                        subscriber.putError(error)
+                    }, completed: {
+                        subscriber.putCompletion()
+                    }))
+                }
+                
+                return disposable
+            }
+        }
+    }
+}
+
+public func runOn<T, E>(_ threadPool: ThreadPool) -> (Signal<T, E>) -> Signal<T, E> {
+    return { signal in
+        return Signal { subscriber in
+            let cancelled = false
+            let disposable = MetaDisposable()
+            
+            let task = ThreadPoolTask { state in
+                if cancelled || state.cancelled.with({ $0 }) {
+                    return
+                }
+                
+                disposable.set(signal.start(next: { next in
+                    subscriber.putNext(next)
+                }, error: { error in
+                    subscriber.putError(error)
+                }, completed: {
+                    subscriber.putCompletion()
+                }))
+            }
+            
+            disposable.set(ActionDisposable {
+                task.cancel()
+            })
+            
+            threadPool.addTask(task)
+            
+            return disposable
+        }
+    }
+}