Swift version

SSignalKit/SBlockDisposable.h

@@ -1,4 +1,4 @@
-#import "SDisposable.h"
+#import <SSignalKit/SDisposable.h>
 
 @interface SBlockDisposable : NSObject <SDisposable>
 

SSignalKit/SDisposableSet.h

@@ -1,4 +1,4 @@
-#import "SDisposable.h"
+#import <SSignalKit/SDisposable.h>
 
 @interface SDisposableSet : NSObject <SDisposable>
 

SSignalKit/SEvent.h

@@ -1,18 +0,0 @@
-#import <Foundation/Foundation.h>
-
-typedef enum {
-    SEventTypeNext,
-    SEventTypeError,
-    SEventTypeCompleted
-} SEventType;
-
-@interface SEvent : NSObject
-
-@property (nonatomic, readonly) SEventType type;
-@property (nonatomic, strong, readonly) id data;
-
-- (instancetype)initWithNext:(id)next;
-- (instancetype)initWithError:(id)error;
-- (instancetype)initWithCompleted;
-
-@end

SSignalKit/SEvent.m

@@ -1,37 +0,0 @@
-#import "SEvent.h"
-
-@implementation SEvent
-
-- (instancetype)initWithNext:(id)next
-{
-    self = [super init];
-    if (self != nil)
-    {
-        _type = SEventTypeNext;
-        _data = next;
-    }
-    return self;
-}
-
-- (instancetype)initWithError:(id)error
-{
-    self = [super init];
-    if (self != nil)
-    {
-        _type = SEventTypeError;
-        _data = error;
-    }
-    return self;
-}
-
-- (instancetype)initWithCompleted
-{
-    self = [super init];
-    if (self != nil)
-    {
-        _type = SEventTypeCompleted;
-    }
-    return self;
-}
-
-@end

SSignalKit/SMetaDisposable.h

@@ -1,4 +1,4 @@
-#import "SDisposable.h"
+#import <SSignalKit/SDisposable.h>
 
 @interface SMetaDisposable : NSObject <SDisposable>
 

SSignalKit/SMulticastSignalManager.h

@@ -1,4 +1,4 @@
-#import "SSignal.h"
+#import <SSignalKit/SSignal.h>
 
 @interface SMulticastSignalManager : NSObject
 

SSignalKit/SSignal+Accumulate.h

@@ -1,4 +1,4 @@
-#import "SSignal.h"
+#import <SSignalKit/SSignal.h>
 
 @interface SSignal (Accumulate)
 

SSignalKit/SSignal+Catch.h

@@ -1,4 +1,4 @@
-#import "SSignal.h"
+#import <SSignalKit/SSignal.h>
 
 @interface SSignal (Catch)
 

SSignalKit/SSignal+Combine.h

@@ -1,4 +1,4 @@
-#import "SSignal.h"
+#import <SSignalKit/SSignal.h>
 
 @interface SSignal (Combine)
 

SSignalKit/SSignal+Dispatch.h

@@ -1,7 +1,7 @@
-#import "SSignal.h"
+#import <SSignalKit/SSignal.h>
 
-#import "SQueue.h"
-#import "SThreadPool.h"
+#import <SSignalKit/SQueue.h>
+#import <SSignalKit/SThreadPool.h>
 
 @interface SSignal (Dispatch)
 

SSignalKit/SSignal+Mapping.h

@@ -1,4 +1,4 @@
-#import "SSignal.h"
+#import <SSignalKit/SSignal.h>
 
 @interface SSignal (Mapping)
 

SSignalKit/SSignal+Meta.h

@@ -1,4 +1,4 @@
-#import "SSignal.h"
+#import <SSignalKit/SSignal.h>
 
 @class SQueue;
 

SSignalKit/SSignal+Meta.m

@@ -19,7 +19,6 @@
     
     NSMutableArray *_queuedSignals;
     bool _queueMode;
-    
 }
 
 @end

SSignalKit/SSignal+Multicast.h

@@ -1,4 +1,4 @@
-#import "SSignal.h"
+#import <SSignalKit/SSignal.h>
 
 @interface SSignal (Multicast)
 

SSignalKit/SSignal+Multicast.m

@@ -80,29 +80,44 @@ typedef enum {
     [currentDisposable dispose];
 }
 
-- (void)notify:(SEvent *)event
+- (void)notifyNext:(id)next
 {
     NSArray *currentSubscribers = nil;
     OSSpinLockLock(&_lock);
     currentSubscribers = [_subscribers copyItems];
-    if (event.type != SEventTypeNext)
-        _state = SSignalMulticastStateCompleted;
     OSSpinLockUnlock(&_lock);
     
     for (SSubscriber *subscriber in currentSubscribers)
     {
-        switch (event.type)
-        {
-            case SEventTypeNext:
-                [subscriber putNext:event.data];
-                break;
-            case SEventTypeError:
-                [subscriber putError:event.data];
-                break;
-            case SEventTypeCompleted:
-                [subscriber putCompletion];
-                break;
-        }
+        [subscriber putNext:next];
+    }
+}
+
+- (void)notifyError:(id)error
+{
+    NSArray *currentSubscribers = nil;
+    OSSpinLockLock(&_lock);
+    currentSubscribers = [_subscribers copyItems];
+    _state = SSignalMulticastStateCompleted;
+    OSSpinLockUnlock(&_lock);
+    
+    for (SSubscriber *subscriber in currentSubscribers)
+    {
+        [subscriber putError:error];
+    }
+}
+
+- (void)notifyCompleted
+{
+    NSArray *currentSubscribers = nil;
+    OSSpinLockLock(&_lock);
+    currentSubscribers = [_subscribers copyItems];
+    _state = SSignalMulticastStateCompleted;
+    OSSpinLockUnlock(&_lock);
+    
+    for (SSubscriber *subscriber in currentSubscribers)
+    {
+        [subscriber putCompletion];
     }
 }
 
@@ -121,13 +136,13 @@ typedef enum {
         {
             id<SDisposable> disposable = [self startWithNext:^(id next)
             {
-                [subscribers notify:[[SEvent alloc] initWithNext:next]];
+                [subscribers notifyNext:next];
             } error:^(id error)
             {
-                [subscribers notify:[[SEvent alloc] initWithError:error]];
+                [subscribers notifyError:error];
             } completed:^
             {
-                [subscribers notify:[[SEvent alloc] initWithCompleted]];
+                [subscribers notifyCompleted];
             }];
             
             [subscribers setDisposable:[[SBlockDisposable alloc] initWithBlock:^

SSignalKit/SSignal+SideEffects.h

@@ -1,4 +1,4 @@
-#import "SSignal.h"
+#import <SSignalKit/SSignal.h>
 
 @interface SSignal (SideEffects)
 

SSignalKit/SSignal+Single.h

@@ -1,4 +1,4 @@
-#import "SSignal.h"
+#import <SSignalKit/SSignal.h>
 
 @interface SSignal (Single)
 

SSignalKit/SSignal+Timing.h

@@ -1,6 +1,6 @@
-#import "SSignal.h"
+#import <SSignalKit/SSignal.h>
 
-#import "SQueue.h"
+#import <SSignalKit/SQueue.h>
 
 @interface SSignal (Timing)
 

SSignalKit/SSignal.h

@@ -1,4 +1,4 @@
-#import "SSubscriber.h"
+#import <SSignalKit/SSubscriber.h>
 
 @interface SSignal : NSObject
 {

SSignalKit/SSignalKit.h

@@ -19,7 +19,6 @@ FOUNDATION_EXPORT const unsigned char SSignalKitVersionString[];
 #import <SSignalKit/SAtomic.h>
 #import <SSignalKit/SBag.h>
 #import <SSignalKit/SSignal.h>
-#import <SSignalKit/SEvent.h>
 #import <SSignalKit/SSubscriber.h>
 #import <SSignalKit/SDisposable.h>
 #import <SSignalKit/SDisposableSet.h>

SSignalKit/SSubscriber.h

@@ -1,5 +1,4 @@
-#import "SDisposable.h"
-#import "SEvent.h"
+#import <SSignalKit/SDisposable.h>
 
 @interface SSubscriber : NSObject <SDisposable>
 {

SwiftSignalKit/Atomic.swift

@@ -0,0 +1,36 @@
+import Foundation
+
+public final class Atomic<T> {
+    private var lock: OSSpinLock = 0
+    private var value: T
+    
+    public init(value: T) {
+        self.value = value
+    }
+    
+    public func with<R>(f: T -> R) -> R {
+        OSSpinLockLock(&self.lock)
+        let result = f(self.value)
+        OSSpinLockUnlock(&self.lock)
+        
+        return result
+    }
+    
+    public func modify(f: T -> T) -> T {
+        OSSpinLockLock(&self.lock)
+        let result = f(self.value)
+        self.value = result
+        OSSpinLockUnlock(&self.lock)
+        
+        return result
+    }
+    
+    public func swap(value: T) -> T {
+        OSSpinLockLock(&self.lock)
+        let previous = self.value
+        self.value = value
+        OSSpinLockUnlock(&self.lock)
+        
+        return previous
+    }
+}

SwiftSignalKit/Bag.swift

@@ -0,0 +1,33 @@
+import Foundation
+
+public final class Bag<T> {
+    public typealias Index = Int
+    private var nextIndex: Index = 0
+    private var items: [T] = []
+    private var itemKeys: [Index] = []
+    
+    public func add(item: T) -> Index {
+        let key = self.nextIndex
+        self.nextIndex++
+        self.items.append(item)
+        self.itemKeys.append(key)
+        
+        return key
+    }
+    
+    public func remove(index: Index) {
+        var i = 0
+        for key in self.itemKeys {
+            if key == index {
+                self.items.removeAtIndex(i)
+                self.itemKeys.removeAtIndex(i)
+                break
+            }
+            i++
+        }
+    }
+    
+    public func copyItems() -> [T] {
+        return self.items
+    }
+}

SwiftSignalKit/Disposable.swift

@@ -0,0 +1,129 @@
+import Foundation
+
+public protocol Disposable
+{
+    func dispose()
+}
+
+internal struct _EmptyDisposable : Disposable {
+    internal func dispose() {
+    }
+}
+
+public let EmptyDisposable: Disposable = _EmptyDisposable()
+
+public final class ActionDisposable : Disposable
+{
+    private var action: () -> Void
+    private var lock: OSSpinLock = 0
+    
+    public init(action: () -> Void) {
+        self.action = action
+    }
+    
+    public func dispose() {
+        var action = doNothing
+        OSSpinLockLock(&self.lock)
+        action = self.action
+        self.action = doNothing
+        OSSpinLockUnlock(&self.lock)
+        action()
+    }
+}
+
+public final class MetaDisposable : Disposable
+{
+    private var lock: OSSpinLock = 0
+    private var disposed = false
+    private var disposable: Disposable! = nil
+    
+    public init() {
+    }
+    
+    public func set(disposable: Disposable?) {
+        var previousDisposable: Disposable! = nil
+        var disposeImmediately = false
+        
+        OSSpinLockLock(&self.lock)
+        disposeImmediately = self.disposed
+        if !disposeImmediately {
+            previousDisposable = self.disposable
+            if let disposable = disposable {
+                self.disposable = disposable
+            } else {
+                self.disposable = nil
+            }
+        }
+        OSSpinLockUnlock(&self.lock)
+        
+        if previousDisposable != nil {
+            previousDisposable.dispose()
+        }
+        
+        if disposeImmediately {
+            if let disposable = disposable {
+                disposable.dispose()
+            }
+        }
+    }
+    
+    public func dispose()
+    {
+        var disposable: Disposable! = nil
+        
+        OSSpinLockLock(&self.lock)
+        if !self.disposed {
+            self.disposed = true
+            disposable = self.disposable
+            self.disposable = nil
+        }
+        OSSpinLockUnlock(&self.lock)
+        
+        if disposable != nil {
+            disposable.dispose()
+        }
+    }
+}
+
+public final class DisposableSet : Disposable {
+    private var lock: OSSpinLock = 0
+    private var disposed = false
+    private var disposables: [Disposable] = []
+    
+    public init() {
+        
+    }
+    
+    public func add(disposable: Disposable) {
+        var disposeImmediately = false
+        
+        OSSpinLockLock(&self.lock)
+        if self.disposed {
+            disposeImmediately = true
+        } else {
+            self.disposables.append(disposable)
+        }
+        OSSpinLockUnlock(&self.lock)
+        
+        if disposeImmediately {
+            disposable.dispose()
+        }
+    }
+    
+    public func dispose() {
+        var disposables: [Disposable] = []
+        OSSpinLockLock(&self.lock)
+        if !self.disposed {
+            self.disposed = true
+            disposables = self.disposables
+            self.disposables = []
+        }
+        OSSpinLockUnlock(&self.lock)
+        
+        if disposables.count != 0 {
+            for disposable in disposables {
+                disposable.dispose()
+            }
+        }
+    }
+}

SwiftSignalKit/Info.plist

@@ -0,0 +1,26 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>org.telegram.$(PRODUCT_NAME:rfc1034identifier)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>FMWK</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>$(CURRENT_PROJECT_VERSION)</string>
+	<key>NSPrincipalClass</key>
+	<string></string>
+</dict>
+</plist>

SwiftSignalKit/Pipe.swift

@@ -0,0 +1,40 @@
+import Foundation
+
+public final class Pipe<T> {
+    let subscribers = Atomic(value: Bag<T -> Void>())
+    
+    public init() {
+        
+    }
+    
+    public func signal() -> Signal<T, Void> {
+        return Signal { [weak self] subscriber in
+            if let strongSelf = self {
+                var index = strongSelf.subscribers.with { value -> Bag<T>.Index in
+                    return value.add { next in
+                        subscriber.putNext(next)
+                    }
+                }
+                
+                return ActionDisposable { [weak strongSelf] in
+                    if let strongSelf = strongSelf {
+                        strongSelf.subscribers.with { value -> Void in
+                            value.remove(index)
+                        }
+                    }
+                }
+            } else {
+                return EmptyDisposable
+            }
+        }
+    }
+    
+    public func putNext(next: T) {
+        let items = self.subscribers.with { value -> [T -> Void] in
+            return value.copyItems()
+        }
+        for f in items {
+            f(next)
+        }
+    }
+}

SwiftSignalKit/Queue.swift

@@ -0,0 +1,69 @@
+import Foundation
+
+private let _QueueSpecificKey = NSObject()
+private let QueueSpecificKey: UnsafePointer<Void> = UnsafePointer<Void>(Unmanaged<AnyObject>.passUnretained(_QueueSpecificKey).toOpaque())
+
+public final class Queue {
+    private let nativeQueue: dispatch_queue_t
+    private var specific: UnsafeMutablePointer<Void>
+    private let specialIsMainQueue: Bool
+    
+    public var queue: dispatch_queue_t {
+        get {
+            return self.nativeQueue
+        }
+    }
+    
+    public class func mainQueue() -> Queue {
+        return Queue(queue: dispatch_get_main_queue(), specialIsMainQueue: true)
+    }
+    
+    public class func concurrentDefaultQueue() -> Queue {
+        return Queue(queue: dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), specialIsMainQueue: false)
+    }
+    
+    public class func concurrentBackgroundQueue() -> Queue {
+        return Queue(queue: dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_BACKGROUND, 0), specialIsMainQueue: false)
+    }
+    
+    public init(queue: dispatch_queue_t) {
+        self.nativeQueue = queue
+        self.specific = nil
+        self.specialIsMainQueue = false
+    }
+    
+    private init(queue: dispatch_queue_t, specialIsMainQueue: Bool) {
+        self.nativeQueue = queue
+        self.specific = nil
+        self.specialIsMainQueue = specialIsMainQueue
+    }
+    
+    public init() {
+        self.nativeQueue = dispatch_queue_create(nil, DISPATCH_QUEUE_SERIAL)
+        self.specific = nil
+        self.specialIsMainQueue = false
+        
+        self.specific = UnsafeMutablePointer<Void>(Unmanaged<Queue>.passUnretained(self).toOpaque())
+        dispatch_queue_set_specific(self.nativeQueue, QueueSpecificKey, self.specific, nil)
+    }
+    
+    public func async(f: Void -> Void) {
+        if self.specific != nil && dispatch_get_specific(QueueSpecificKey) == self.specific {
+            f()
+        } else if self.specialIsMainQueue && NSThread.isMainThread() {
+            f()
+        } else {
+            dispatch_async(self.nativeQueue, f)
+        }
+    }
+    
+    public func dispatch(f: Void -> Void) {
+        if self.specific != nil && dispatch_get_specific(QueueSpecificKey) == self.specific {
+            f()
+        } else if self.specialIsMainQueue && NSThread.isMainThread() {
+            f()
+        } else {
+            dispatch_async(self.nativeQueue, f)
+        }
+    }
+}

SwiftSignalKit/Signal.swift

@@ -0,0 +1,43 @@
+import Foundation
+
+internal let doNothing: () -> Void = { _ in }
+
+public func identity<A>(a: A) -> A {
+    return a;
+}
+
+infix operator |> { associativity left precedence 95 }
+
+public func |> <T, U>(value: T, function: (T -> U)) -> U {
+    return function(value)
+}
+
+private final class SubscriberDisposable<T, E> : Disposable {
+    private let subscriber: Subscriber<T, E>
+    private let disposable: Disposable
+    
+    init(subscriber: Subscriber<T, E>, disposable: Disposable) {
+        self.subscriber = subscriber
+        self.disposable = disposable
+    }
+    
+    func dispose() {
+        subscriber.markTerminatedWithoutDisposal()
+        disposable.dispose()
+    }
+}
+
+public struct Signal<T, E> {
+    private let generator: Subscriber<T, E> -> Disposable
+    
+    public init(_ generator: Subscriber<T, E> -> Disposable) {
+        self.generator = generator
+    }
+    
+    public func start(next: (T -> Void)! = nil, error: (E -> Void)! = nil, completed: (() -> Void)! = nil) -> Disposable {
+        let subscriber = Subscriber<T, E>(next: next, error: error, completed: completed)
+        let disposable = self.generator(subscriber)
+        subscriber.assignDisposable(disposable)
+        return SubscriberDisposable(subscriber: subscriber, disposable: disposable)
+    }
+}

SwiftSignalKit/Signal_Catch.swift

@@ -0,0 +1,61 @@
+import Foundation
+
+public func catch<T, E>(f: E -> Signal<T, E>)(signal: Signal<T, E>) -> Signal<T, E> {
+    return Signal<T, E> { subscriber in
+        let disposable = DisposableSet()
+        
+        disposable.add(signal.start(next: { next in
+            subscriber.putNext(next)
+        }, error: { error in
+            let anotherSignal = f(error)
+            
+            disposable.add(anotherSignal.start(next: { next in
+                subscriber.putNext(next)
+            }, error: { error in
+               subscriber.putError(error)
+            }, completed: {
+                subscriber.putCompletion()
+            }))
+        }, completed: {
+            subscriber.putCompletion()
+        }))
+        
+        return disposable
+    }
+}
+
+private func recursiveFunction(f: (Void -> Void) -> Void) -> (Void -> Void) {
+    return {
+        f(recursiveFunction(f))
+    }
+}
+
+public func restart<T, E>(signal: Signal<T, E>) -> Signal<T, E> {
+    return Signal { subscriber in
+        let shouldRestart = Atomic(value: true)
+        let currentDisposable = MetaDisposable()
+        
+        let start = recursiveFunction { recurse in
+            let currentShouldRestart = shouldRestart.with { value in
+                return value
+            }
+            if currentShouldRestart {
+                let disposable = signal.start(next: { next in
+                    subscriber.putNext(next)
+                }, error: { error in
+                    subscriber.putError(error)
+                }, completed: {
+                    recurse()
+                })
+                currentDisposable.set(disposable)
+            }
+        }
+        
+        start()
+        
+        return ActionDisposable {
+            currentDisposable.dispose()
+            shouldRestart.swap(false)
+        }
+    }
+}

SwiftSignalKit/Signal_Combine.swift

@@ -0,0 +1,91 @@
+import Foundation
+
+private struct SignalCombineState {
+    let values: [Int : Any]
+    let completed: Set<Int>
+    let error: Bool
+}
+
+private func combineLatestAny<E, R>(signals: [Signal<Any, E>], combine: [Any] -> R) -> Signal<R, E> {
+    return Signal { subscriber in
+        
+        let state = Atomic(value: SignalCombineState(values: [:], completed: Set(), error: false))
+        let disposable = DisposableSet()
+        
+        let count = signals.count
+        for index in 0 ..< count {
+            let signalDisposable = signals[index].start(next: { next in
+                let currentState = state.modify { current in
+                    var values = current.values
+                    values[index] = next
+                    return SignalCombineState(values: values, completed: current.completed, error: current.error)
+                }
+                if currentState.values.count == count {
+                    var values: [Any] = []
+                    for i in 0 ..< count {
+                        values.append(currentState.values[i]!)
+                    }
+                    subscriber.putNext(combine(values))
+                }
+            }, error: { error in
+                var emitError = false
+                state.modify { current in
+                    if !current.error {
+                        emitError = true
+                        return SignalCombineState(values: current.values, completed: current.completed, error: true)
+                    } else {
+                        return current
+                    }
+                }
+            }, completed: {
+                var emitCompleted = false
+                state.modify { current in
+                    if !current.completed.contains(index) {
+                        var completed = current.completed
+                        completed.insert(index)
+                        emitCompleted = completed.count == count
+                        return SignalCombineState(values: current.values, completed: completed, error: current.error)
+                    }
+                    return current
+                }
+                if emitCompleted {
+                    subscriber.putCompletion()
+                }
+            })
+            
+            disposable.add(signalDisposable)
+        }
+        
+        return disposable;
+    }
+}
+
+private func signalOfAny<T, E>(signal: Signal<T, E>) -> Signal<Any, E> {
+    return Signal { subscriber in
+        return signal.start(next: { next in
+            subscriber.putNext(next)
+        }, error: { error in
+            subscriber.putError(error)
+        }, completed: {
+            subscriber.putCompletion()
+        })
+    }
+}
+
+public func combineLatest<T1, T2, E>(s1: Signal<T1, E>, s2: Signal<T2, E>) -> Signal<(T1, T2), E> {
+    return combineLatestAny([signalOfAny(s1), signalOfAny(s2)], { values in
+        return (values[0] as! T1, values[1] as! T2)
+    })
+}
+
+public func combineLatest<T1, T2, T3, E>(s1: Signal<T1, E>, s2: Signal<T2, E>, s3: Signal<T3, E>) -> Signal<(T1, T2, T3), E> {
+    return combineLatestAny([signalOfAny(s1), signalOfAny(s2), signalOfAny(s3)], { values in
+        return (values[0] as! T1, values[1] as! T2, values[2] as! T3)
+    })
+}
+
+public func combineLatest<T1, T2, T3, T4, E>(s1: Signal<T1, E>, s2: Signal<T2, E>, s3: Signal<T3, E>, s4: Signal<T4, E>) -> Signal<(T1, T2, T3, T4), E> {
+    return combineLatestAny([signalOfAny(s1), signalOfAny(s2), signalOfAny(s3), signalOfAny(s4)], { values in
+        return (values[0] as! T1, values[1] as! T2, values[2] as! T3, values[3] as! T4)
+    })
+}

SwiftSignalKit/Signal_Dispatch.swift

@@ -0,0 +1,77 @@
+import Foundation
+
+public func deliverOn<T, E>(queue: Queue)(signal: Signal<T, E>) -> Signal<T, E> {
+    return Signal { subscriber in
+        return signal.start(next: { next in
+            queue.dispatch {
+                subscriber.putNext(next)
+            }
+        }, error: { error in
+            queue.dispatch {
+                subscriber.putError(error)
+            }
+        }, completed: {
+            queue.dispatch {
+                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: Signal<T, E>) -> Signal<T, E> {
+    return Signal { subscriber in
+        let queue = threadPool.nextQueue()
+        return signal.start(next: { next in
+            queue.addTask(ThreadPoolTask { state in
+                if !state.cancelled {
+                    subscriber.putNext(next)
+                }
+            })
+        }, error: { error in
+            queue.addTask(ThreadPoolTask { state in
+                if !state.cancelled {
+                    subscriber.putError(error)
+                }
+            })
+        }, completed: {
+            queue.addTask(ThreadPoolTask { state in
+                if !state.cancelled {
+                    subscriber.putCompletion()
+                }
+            })
+        })
+    }
+}
+
+public func runOn<T, E>(threadPool: ThreadPool)(signal: Signal<T, E>) -> Signal<T, E> {
+    return Signal { subscriber in
+        var cancelled = false
+        let disposable = MetaDisposable()
+        
+        let task = ThreadPoolTask { state in
+            if cancelled || state.cancelled {
+                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
+    }
+}

SwiftSignalKit/Signal_Mapping.swift

@@ -0,0 +1,27 @@
+import Foundation
+
+public func map<T, E, R>(f: T -> R)(signal: Signal<T, E>) -> Signal<R, E> {
+    return Signal<R, E> { subscriber in
+        return signal.start(next: { next in
+            subscriber.putNext(f(next))
+        }, error: { error in
+            subscriber.putError(error)
+        }, completed: {
+            subscriber.putCompletion()
+        })
+    }
+}
+
+public func filter<T, E>(f: T -> Bool)(signal: Signal<T, E>) -> Signal<T, E> {
+    return Signal<T, E> { subscriber in
+        return signal.start(next: { next in
+            if f(next) {
+                subscriber.putNext(next)
+            }
+        }, error: { error in
+            subscriber.putError(error)
+        }, completed: {
+            subscriber.putCompletion()
+        })
+    }
+}

SwiftSignalKit/Signal_Meta.swift

@@ -0,0 +1,153 @@
+import Foundation
+
+private final class SignalQueueState<T, E> : Disposable {
+    var lock: OSSpinLock = 0
+    var executingSignal = false
+    var terminated = false
+    
+    var disposable: Disposable = EmptyDisposable
+    let currentDisposable = MetaDisposable()
+    let subscriber: Subscriber<T, E>
+    
+    var queuedSignals: [Signal<T, E>] = []
+    let queueMode: Bool
+    
+    init(subscriber: Subscriber<T, E>, queueMode: Bool) {
+        self.subscriber = subscriber
+        self.queueMode = queueMode
+    }
+    
+    func beginWithDisposable(disposable: Disposable) {
+        self.disposable = disposable
+    }
+    
+    func enqueueSignal(signal: Signal<T, E>) {
+        var startSignal = false
+        OSSpinLockLock(&self.lock)
+        if self.queueMode && self.executingSignal {
+            self.queuedSignals.append(signal)
+        } else {
+            self.executingSignal = true
+            startSignal = true
+        }
+        OSSpinLockUnlock(&self.lock)
+        
+        if startSignal {
+            let disposable = signal.start(next: { next in
+                self.subscriber.putNext(next)
+            }, error: { error in
+                self.subscriber.putError(error)
+            }, completed: {
+                self.headCompleted()
+            })
+            self.currentDisposable.set(disposable)
+        }
+    }
+    
+    func headCompleted() {
+        var nextSignal: Signal<T, E>! = nil
+        
+        var terminated = false
+        OSSpinLockLock(&self.lock)
+        self.executingSignal = false
+        if self.queueMode {
+            if self.queuedSignals.count != 0 {
+                nextSignal = self.queuedSignals[0]
+                self.queuedSignals.removeAtIndex(0)
+                self.executingSignal = true
+            } else {
+                terminated = self.terminated
+            }
+        } else {
+            terminated = self.terminated
+        }
+        OSSpinLockUnlock(&self.lock)
+        
+        if terminated {
+            self.subscriber.putCompletion()
+        } else if nextSignal != nil {
+            let disposable = nextSignal.start(next: { next in
+                self.subscriber.putNext(next)
+            }, error: { error in
+                self.subscriber.putError(error)
+            }, completed: {
+                self.headCompleted()
+            })
+        }
+    }
+    
+    func beginCompletion() {
+        var executingSignal = false
+        OSSpinLockLock(&self.lock)
+        executingSignal = self.executingSignal
+        self.terminated = true
+        OSSpinLockUnlock(&self.lock)
+        
+        if !executingSignal {
+            self.subscriber.putCompletion()
+        }
+    }
+    
+    func dispose() {
+        self.currentDisposable.dispose()
+        self.disposable.dispose()
+    }
+}
+
+public func switchToLatest<T, E>(signal: Signal<Signal<T, E>, E>) -> Signal<T, E> {
+    return Signal { subscriber in
+        let state = SignalQueueState(subscriber: subscriber, queueMode: false)
+        state.beginWithDisposable(signal.start(next: { next in
+            state.enqueueSignal(next)
+        }, error: { error in
+            subscriber.putError(error)
+        }, completed: {
+            state.beginCompletion()
+        }))
+        return state
+    }
+}
+
+public func queue<T, E>(signal: Signal<Signal<T, E>, E>) -> Signal<T, E> {
+    return Signal { subscriber in
+        let state = SignalQueueState(subscriber: subscriber, queueMode: true)
+        state.beginWithDisposable(signal.start(next: { next in
+            state.enqueueSignal(next)
+        }, error: { error in
+            subscriber.putError(error)
+        }, completed: {
+            state.beginCompletion()
+        }))
+        return state
+    }
+}
+
+public func mapToSignal<T, R, E>(f: T -> Signal<R, E>)(signal: Signal<T, E>) -> Signal<R, E> {
+    return signal |> map { f($0) } |> switchToLatest
+}
+
+public func mapToQueue<T, R, E>(f: T -> Signal<R, E>)(signal: Signal<T, E>) -> Signal<R, E> {
+    return signal |> map { f($0) } |> queue
+}
+
+public func then<T, E>(nextSignal: Signal<T, E>)(signal: Signal<T, E>) -> Signal<T, E> {
+    return Signal<T, E> { subscriber in
+        let disposable = DisposableSet()
+        
+        disposable.add(signal.start(next: { next in
+            subscriber.putNext(next)
+        }, error: { error in
+            subscriber.putError(error)
+        }, completed: {
+            disposable.add(nextSignal.start(next: { next in
+                subscriber.putNext(next)
+            }, error: { error in
+                subscriber.putError(error)
+            }, completed: {
+                subscriber.putCompletion()
+            }))
+        }))
+        
+        return disposable
+    }
+}

SwiftSignalKit/Signal_Reduce.swift

@@ -0,0 +1,34 @@
+import Foundation
+
+public func reduceLeft<T, E>(value: T, f: (T, T) -> T)(signal: Signal<T, E>) -> Signal<T, E> {
+    return Signal<T, E> { subscriber in
+        var currentValue = value
+        
+        return signal.start(next: { next in
+            currentValue = f(currentValue, next)
+        }, error: { error in
+            subscriber.putError(error)
+        }, completed: {
+            subscriber.putNext(currentValue)
+            subscriber.putCompletion()
+        })
+    }
+}
+
+public func reduceLeft<T, E>(value: T, f: (T, T, T -> Void) -> T)(signal: Signal<T, E>) -> Signal<T, E> {
+    return Signal<T, E> { subscriber in
+        var currentValue = value
+        let emit: T -> Void = { next in
+            subscriber.putNext(next)
+        }
+        
+        return signal.start(next: { next in
+            currentValue = f(currentValue, next, emit)
+            }, error: { error in
+                subscriber.putError(error)
+            }, completed: {
+                subscriber.putNext(currentValue)
+                subscriber.putCompletion()
+        })
+    }
+}

SwiftSignalKit/Signal_SideEffects.swift

@@ -0,0 +1,45 @@
+import Foundation
+
+public func beforeNext<T, E, R>(f: T -> R)(signal: Signal<T, E>) -> Signal<T, E> {
+    return Signal<T, E> { subscriber in
+        return signal.start(next: { next in
+            let unused = f(next)
+            subscriber.putNext(next)
+        }, error: { error in
+            subscriber.putError(error)
+        }, completed: {
+            subscriber.putCompletion()
+        })
+    }
+}
+
+public func afterNext<T, E, R>(f: T -> R)(signal: Signal<T, E>) -> Signal<T, E> {
+    return Signal<T, E> { subscriber in
+        return signal.start(next: { next in
+            subscriber.putNext(next)
+            let unused = f(next)
+        }, error: { error in
+            subscriber.putError(error)
+        }, completed: {
+            subscriber.putCompletion()
+        })
+    }
+}
+
+public func afterDisposed<T, E, R>(f: Void -> R)(signal: Signal<T, E>) -> Signal<T, E> {
+    return Signal<T, E> { subscriber in
+        let disposable = DisposableSet()
+        disposable.add(signal.start(next: { next in
+            subscriber.putNext(next)
+        }, error: { error in
+            subscriber.putError(error)
+        }, completed: {
+            subscriber.putCompletion()
+        }))
+        disposable.add(ActionDisposable {
+            let unused = f()
+        })
+        
+        return disposable
+    }
+}

SwiftSignalKit/Signal_Single.swift

@@ -0,0 +1,28 @@
+import Foundation
+
+extension Signal {
+    public static func single(value: T) -> Signal<T, E> {
+        return Signal<T, E> { subscriber in
+            subscriber.putNext(value)
+            subscriber.putCompletion()
+            
+            return EmptyDisposable
+        }
+    }
+    
+    public static func fail(error: E) -> Signal<T, E> {
+        return Signal<T, E> { subscriber in
+            subscriber.putError(error)
+            
+            return EmptyDisposable
+        }
+    }
+    
+    public static func complete() -> Signal<T, E> {
+        return Signal<T, E> { subscriber in
+            subscriber.putCompletion()
+            
+            return EmptyDisposable
+        }
+    }
+}

SwiftSignalKit/Signal_Take.swift

@@ -0,0 +1,27 @@
+import Foundation
+
+public func take<T, E>(count: Int)(signal: Signal<T, E>) -> Signal<T, E> {
+    return Signal { subscriber in
+        let counter = Atomic(value: 0)
+        return signal.start(next: { next in
+            var passthrough = false
+            var complete = false
+            counter.modify { value in
+                let updatedCount = value + 1
+                passthrough = updatedCount <= count
+                complete = updatedCount == count
+                return updatedCount
+            }
+            if passthrough {
+                subscriber.putNext(next)
+            }
+            if complete {
+                subscriber.putCompletion()
+            }
+        }, error: { error in
+            subscriber.putError(error)
+        }, completed: {
+            subscriber.putCompletion()
+        })
+    }
+}

SwiftSignalKit/Signal_Timing.swift

@@ -0,0 +1,56 @@
+import Foundation
+
+public func delay<T, E>(timeout: NSTimeInterval, queue: Queue)(signal: Signal<T, E>) -> Signal<T, E> {
+    return Signal<T, E> { subscriber in
+        let disposable = MetaDisposable()
+        let timer = Timer(timeout: timeout, repeat: false, completion: {
+            disposable.set(signal.start(next: { next in
+                subscriber.putNext(next)
+            }, error: { error in
+                subscriber.putError(error)
+            }, completed: {
+                subscriber.putCompletion()
+            }))
+        }, queue: queue)
+        disposable.set(ActionDisposable {
+            timer.invalidate()
+        })
+        timer.start()
+        return disposable
+    }
+}
+
+public func timeout<T, E>(timeout: NSTimeInterval, queue: Queue, alternate: Signal<T, E>)(signal: Signal<T, E>) -> Signal<T, E> {
+    return Signal<T, E> { subscriber in
+        let disposable = MetaDisposable()
+        let timer = Timer(timeout: timeout, repeat: false, completion: {
+            disposable.set(alternate.start(next: { next in
+                subscriber.putNext(next)
+            }, error: { error in
+                subscriber.putError(error)
+            }, completed: {
+                subscriber.putCompletion()
+            }))
+        }, queue: queue)
+        
+        disposable.set(signal.start(next: { next in
+            timer.invalidate()
+            subscriber.putNext(next)
+        }, error: { error in
+            timer.invalidate()
+            subscriber.putError(error)
+        }, completed: {
+            timer.invalidate()
+            subscriber.putCompletion()
+        }))
+        timer.start()
+        
+        let disposableSet = DisposableSet()
+        disposableSet.add(ActionDisposable {
+            timer.invalidate()
+        })
+        disposableSet.add(disposable)
+        
+        return disposableSet
+    }
+}

SwiftSignalKit/Subscriber.swift

@@ -0,0 +1,101 @@
+import Foundation
+
+public final class Subscriber<T, E> {
+    private var next: (T -> Void)!
+    private var error: (E -> Void)!
+    private var completed: (() -> Void)!
+    
+    private var lock: OSSpinLock = 0
+    private var terminated = false
+    internal var disposable: Disposable!
+    
+    public init(next: (T -> Void)! = nil, error: (E -> Void)! = nil, completed: (() -> Void)! = nil) {
+        self.next = next
+        self.error = error
+        self.completed = completed
+    }
+    
+    internal func assignDisposable(disposable: Disposable) {
+        if self.terminated {
+            disposable.dispose()
+        } else {
+            self.disposable = disposable
+        }
+    }
+    
+    internal func markTerminatedWithoutDisposal() {
+        OSSpinLockLock(&self.lock)
+        if !self.terminated {
+            self.terminated = true
+            self.next = nil
+            self.error = nil
+            self.completed = nil
+        }
+        OSSpinLockUnlock(&self.lock)
+    }
+    
+    public func putNext(next: T) {
+        var action: (T -> Void)! = nil
+        OSSpinLockLock(&self.lock)
+        if !self.terminated {
+            action = self.next
+        }
+        OSSpinLockUnlock(&self.lock)
+        
+        if action != nil {
+            action(next)
+        }
+    }
+    
+    public func putError(error: E) {
+        var shouldDispose = false
+        var action: (E -> Void)! = nil
+        
+        OSSpinLockLock(&self.lock);
+        if !self.terminated {
+            action = self.error
+            shouldDispose = true;
+            self.next = nil
+            self.error = nil
+            self.completed = nil;
+            self.terminated = true
+        }
+        OSSpinLockUnlock(&self.lock);
+        
+        if action != nil {
+            action(error)
+        }
+        
+        if shouldDispose && self.disposable != nil {
+            let disposable = self.disposable
+            disposable.dispose()
+            self.disposable = nil
+        }
+    }
+    
+    public func putCompletion() {
+        var shouldDispose = false
+        var action: (() -> Void)! = nil
+        
+        OSSpinLockLock(&self.lock);
+        if !self.terminated {
+            action = self.completed
+            shouldDispose = true;
+            self.next = nil
+            self.error = nil
+            self.completed = nil;
+            self.terminated = true
+        }
+        OSSpinLockUnlock(&self.lock);
+        
+        if action != nil {
+            action()
+        }
+        
+        if shouldDispose && self.disposable != nil {
+            let disposable = self.disposable
+            disposable.dispose()
+            self.disposable = nil
+        }
+    }
+}

SwiftSignalKit/SwiftSignalKit.h

@@ -0,0 +1,19 @@
+//
+//  SwiftSignalKit.h
+//  SwiftSignalKit
+//
+//  Created by Peter on 10/06/15.
+//  Copyright (c) 2015 Telegram. All rights reserved.
+//
+
+#import <UIKit/UIKit.h>
+
+//! Project version number for SwiftSignalKit.
+FOUNDATION_EXPORT double SwiftSignalKitVersionNumber;
+
+//! Project version string for SwiftSignalKit.
+FOUNDATION_EXPORT const unsigned char SwiftSignalKitVersionString[];
+
+// In this header, you should import all the public headers of your framework using statements like #import <SwiftSignalKit/PublicHeader.h>
+
+

SwiftSignalKit/ThreadPool.swift

@@ -0,0 +1,154 @@
+import Foundation
+
+public final class ThreadPoolTaskState {
+    public var cancelled = false
+}
+
+public final class ThreadPoolTask {
+    private let state = ThreadPoolTaskState()
+    private let action: ThreadPoolTaskState -> ()
+    
+    public init(_ action: ThreadPoolTaskState -> ()) {
+        self.action = action
+    }
+    
+    internal func execute() {
+        if !state.cancelled {
+            self.action(self.state)
+        }
+    }
+    
+    public func cancel() {
+        self.state.cancelled = true
+    }
+}
+
+public final class ThreadPoolQueue : Equatable {
+    private weak var threadPool: ThreadPool?
+    private var tasks: [ThreadPoolTask] = []
+    
+    public init(threadPool: ThreadPool) {
+        self.threadPool = threadPool
+    }
+    
+    public func addTask(task: ThreadPoolTask) {
+        if let threadPool = self.threadPool {
+            threadPool.workOnQueue(self, action: {
+                self.tasks.append(task)
+            })
+        }
+    }
+    
+    private func popFirstTask() -> ThreadPoolTask? {
+        if self.tasks.count != 0 {
+            let task = self.tasks[0];
+            self.tasks.removeAtIndex(0)
+            return task
+        } else {
+            return nil
+        }
+    }
+    
+    private func hasTasks() -> Bool {
+        return self.tasks.count != 0
+    }
+}
+
+public func ==(lhs: ThreadPoolQueue, rhs: ThreadPoolQueue) -> Bool {
+    return lhs === rhs
+}
+
+@objc public final class ThreadPool {
+    private var threads: [NSThread] = []
+    private var queues: [ThreadPoolQueue] = []
+    private var takenQueues: [ThreadPoolQueue] = []
+    private var mutex: pthread_mutex_t
+    private var condition: pthread_cond_t
+    
+    private class func threadEntryPoint(threadPool: ThreadPool) {
+        var queue: ThreadPoolQueue!
+        
+        while (true) {
+            var task: ThreadPoolTask!
+            
+            pthread_mutex_lock(&threadPool.mutex);
+            
+            if queue != nil {
+                if let index = find(threadPool.takenQueues, queue) {
+                    threadPool.takenQueues.removeAtIndex(index)
+                }
+                
+                if queue.hasTasks() {
+                    threadPool.queues.append(queue);
+                }
+            }
+            
+            while (true)
+            {
+                while threadPool.queues.count == 0 {
+                    pthread_cond_wait(&threadPool.condition, &threadPool.mutex);
+                }
+                
+                if threadPool.queues.count != 0 {
+                    queue = threadPool.queues[0]
+                }
+                
+                if queue != nil {
+                    task = queue.popFirstTask()
+                    threadPool.takenQueues.append(queue)
+                    
+                    if let index = find(threadPool.queues, queue) {
+                        threadPool.queues.removeAtIndex(index)
+                    }
+                    
+                    break
+                }
+            }
+            pthread_mutex_unlock(&threadPool.mutex);
+            
+            if task != nil {
+                task.execute()
+            }
+        }
+    }
+    
+    public init(threadCount: Int, threadPriority: Double) {
+        assert(threadCount > 0, "threadCount < 0")
+        
+        self.mutex = pthread_mutex_t()
+        self.condition = pthread_cond_t()
+        pthread_mutex_init(&self.mutex, nil)
+        pthread_cond_init(&self.condition, nil)
+        
+        for i in 0 ..< threadCount {
+            var thread = NSThread(target: ThreadPool.self, selector: Selector("threadEntryPoint"), object: self)
+            thread.threadPriority = threadPriority
+            self.threads.append(thread)
+            thread.start()
+        }
+    }
+    
+    deinit {
+        pthread_mutex_destroy(&self.mutex)
+        pthread_cond_destroy(&self.condition)
+    }
+    
+    public func addTask(task: ThreadPoolTask) {
+        let tempQueue = self.nextQueue()
+        tempQueue.addTask(task)
+    }
+    
+    private func workOnQueue(queue: ThreadPoolQueue, action: () -> ()) {
+        pthread_mutex_lock(&self.mutex)
+        action()
+        if !contains(self.queues, queue) && !contains(self.takenQueues, queue) {
+            self.queues.append(queue)
+        }
+        pthread_cond_broadcast(&self.condition)
+        pthread_mutex_unlock(&self.mutex)
+    }
+    
+    public func nextQueue() -> ThreadPoolQueue {
+        return ThreadPoolQueue(threadPool: self)
+    }
+}

SwiftSignalKit/Timer.swift

@@ -0,0 +1,41 @@
+import Foundation
+
+public final class Timer {
+    private var timer: dispatch_source_t!
+    private var timeout: NSTimeInterval
+    private var repeat: Bool
+    private var completion: Void -> Void
+    private var queue: Queue
+    
+    public init(timeout: NSTimeInterval, repeat: Bool, completion: Void -> Void, queue: Queue) {
+        self.timeout = timeout
+        self.repeat = repeat
+        self.completion = completion
+        self.queue = queue
+    }
+    
+    deinit {
+        self.invalidate()
+    }
+    
+    public func start() {
+        self.timer = dispatch_source_create(DISPATCH_SOURCE_TYPE_TIMER, 0, 0, self.queue.queue)
+        dispatch_source_set_timer(self.timer, dispatch_time(DISPATCH_TIME_NOW, Int64(self.timeout * NSTimeInterval(NSEC_PER_SEC))), self.repeat ? UInt64(self.timeout * NSTimeInterval(NSEC_PER_SEC)) : DISPATCH_TIME_FOREVER, 0);
+        dispatch_source_set_event_handler(self.timer,  { [weak self] in
+            if let strongSelf = self {
+                strongSelf.completion()
+                if !strongSelf.repeat {
+                    strongSelf.invalidate()
+                }
+            }
+        })
+        dispatch_resume(self.timer)
+    }
+    
+    public func invalidate() {
+        if self.timer != nil {
+            dispatch_source_cancel(self.timer)
+            self.timer = nil
+        }
+    }
+}

SwiftSignalKitTests/DeallocatingObject.swift

@@ -0,0 +1,19 @@
+import Foundation
+
+internal class DeallocatingObject : Printable {
+    private var deallocated: UnsafeMutablePointer<Bool>
+    
+    init(deallocated: UnsafeMutablePointer<Bool>) {
+        self.deallocated = deallocated
+    }
+    
+    deinit {
+        self.deallocated.memory = true
+    }
+    
+    public var description: String {
+        get {
+            return ""
+        }
+    }
+}

SwiftSignalKitTests/Info.plist

@@ -0,0 +1,24 @@
+<?xml version="1.0" encoding="UTF-8"?>
+<!DOCTYPE plist PUBLIC "-//Apple//DTD PLIST 1.0//EN" "http://www.apple.com/DTDs/PropertyList-1.0.dtd">
+<plist version="1.0">
+<dict>
+	<key>CFBundleDevelopmentRegion</key>
+	<string>en</string>
+	<key>CFBundleExecutable</key>
+	<string>$(EXECUTABLE_NAME)</string>
+	<key>CFBundleIdentifier</key>
+	<string>org.telegram.$(PRODUCT_NAME:rfc1034identifier)</string>
+	<key>CFBundleInfoDictionaryVersion</key>
+	<string>6.0</string>
+	<key>CFBundleName</key>
+	<string>$(PRODUCT_NAME)</string>
+	<key>CFBundlePackageType</key>
+	<string>BNDL</string>
+	<key>CFBundleShortVersionString</key>
+	<string>1.0</string>
+	<key>CFBundleSignature</key>
+	<string>????</string>
+	<key>CFBundleVersion</key>
+	<string>1</string>
+</dict>
+</plist>

SwiftSignalKitTests/SwiftSignalKitBasicTests.swift

@@ -0,0 +1,259 @@
+import UIKit
+import XCTest
+import SwiftSignalKit
+
+class SwiftSignalKitTests: XCTestCase {
+    override func setUp() {
+        super.setUp()
+    }
+    
+    override func tearDown() {
+        super.tearDown()
+    }
+    
+    func testActionDisposableDisposed() {
+        var deallocated = false
+        var disposed = false
+        if true {
+            var object: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated)
+            let disposable = ActionDisposable(action: { [object] () -> Void in
+                object.debugDescription
+                disposed = true
+            })
+            object = nil
+            XCTAssertFalse(deallocated, "deallocated != false")
+            disposable.dispose()
+        }
+        
+        XCTAssertTrue(deallocated, "deallocated != true")
+        XCTAssertTrue(disposed, "disposed != true")
+    }
+    
+    func testActionDisposableNotDisposed() {
+        var deallocated = false
+        var disposed = false
+        if true {
+            var object: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated)
+            let disposable = ActionDisposable(action: { [object] () -> Void in
+                object.debugDescription
+                disposed = true
+            })
+        }
+        XCTAssertTrue(deallocated, "deallocated != true")
+        XCTAssertFalse(disposed, "disposed != false")
+    }
+    
+    func testMetaDisposableDisposed() {
+        var deallocated = false
+        var disposed = false
+        if true {
+            var object: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated)
+            let disposable = ActionDisposable(action: { [object] () -> Void in
+                object.debugDescription
+                disposed = true
+            })
+            
+            let metaDisposable = MetaDisposable()
+            metaDisposable.set(disposable)
+            metaDisposable.dispose()
+        }
+        XCTAssertTrue(deallocated, "deallocated != true")
+        XCTAssertTrue(disposed, "disposed != true")
+    }
+    
+    func testMetaDisposableDisposedMultipleTimes() {
+        var deallocated1 = false
+        var disposed1 = false
+        var deallocated2 = false
+        var disposed2 = false
+        if true {
+            var object1: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated1)
+            let actionDisposable1 = ActionDisposable(action: { [object1] () -> Void in
+                object1.debugDescription
+                disposed1 = true
+            })
+            
+            var object2: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated2)
+            let actionDisposable2 = ActionDisposable(action: { [object2] () -> Void in
+                object2.debugDescription
+                disposed2 = true
+            })
+            
+            let metaDisposable = MetaDisposable()
+            metaDisposable.set(actionDisposable1)
+            metaDisposable.set(actionDisposable2)
+            metaDisposable.dispose()
+        }
+        XCTAssertTrue(deallocated1, "deallocated1 != true")
+        XCTAssertTrue(disposed1, "disposed1 != true")
+        XCTAssertTrue(deallocated2, "deallocated2 != true")
+        XCTAssertTrue(disposed2, "disposed2 != true")
+    }
+    
+    func testMetaDisposableNotDisposed() {
+        var deallocated = false
+        var disposed = false
+        if true {
+            var object: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated)
+            let disposable = ActionDisposable(action: { [object] () -> Void in
+                object.debugDescription
+                disposed = true
+            })
+            
+            let metaDisposable = MetaDisposable()
+            metaDisposable.set(disposable)
+        }
+        XCTAssertTrue(deallocated, "deallocated != true")
+        XCTAssertFalse(disposed, "disposed != false")
+    }
+    
+    func testDisposableSetSingleDisposed() {
+        var deallocated = false
+        var disposed = false
+        if true {
+            var object: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated)
+            let disposable = ActionDisposable(action: { [object] () -> Void in
+                object.debugDescription
+                disposed = true
+            })
+            
+            let disposableSet = DisposableSet()
+            disposableSet.add(disposable)
+            disposableSet.dispose()
+        }
+        XCTAssertTrue(deallocated, "deallocated != true")
+        XCTAssertTrue(disposed, "disposed != true")
+    }
+    
+    func testDisposableSetMultipleDisposed() {
+        var deallocated1 = false
+        var disposed1 = false
+        var deallocated2 = false
+        var disposed2 = false
+        if true {
+            var object1: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated1)
+            let actionDisposable1 = ActionDisposable(action: { [object1] () -> Void in
+                object1.debugDescription
+                disposed1 = true
+            })
+            
+            var object2: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated2)
+            let actionDisposable2 = ActionDisposable(action: { [object2] () -> Void in
+                object2.debugDescription
+                disposed2 = true
+            })
+            
+            let disposableSet = DisposableSet()
+            disposableSet.add(actionDisposable1)
+            disposableSet.add(actionDisposable2)
+            disposableSet.dispose()
+        }
+        XCTAssertTrue(deallocated1, "deallocated1 != true")
+        XCTAssertTrue(disposed1, "disposed1 != true")
+        XCTAssertTrue(deallocated2, "deallocated2 != true")
+        XCTAssertTrue(disposed2, "disposed2 != true")
+    }
+    
+    func testDisposableSetSingleNotDisposed() {
+        var deallocated = false
+        var disposed = false
+        if true {
+            var object: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated)
+            let disposable = ActionDisposable(action: { [object] () -> Void in
+                object.debugDescription
+                disposed = true
+            })
+            
+            let disposableSet = DisposableSet()
+            disposableSet.add(disposable)
+        }
+        XCTAssertTrue(deallocated, "deallocated != true")
+        XCTAssertFalse(disposed, "disposed != false")
+    }
+    
+    func testDisposableSetMultipleNotDisposed() {
+        var deallocated1 = false
+        var disposed1 = false
+        var deallocated2 = false
+        var disposed2 = false
+        if true {
+            var object1: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated1)
+            let actionDisposable1 = ActionDisposable(action: { [object1] () -> Void in
+                object1.debugDescription
+                disposed1 = true
+            })
+            
+            var object2: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated2)
+            let actionDisposable2 = ActionDisposable(action: { [object2] () -> Void in
+                object2.debugDescription
+                disposed2 = true
+            })
+            
+            let disposableSet = DisposableSet()
+            disposableSet.add(actionDisposable1)
+            disposableSet.add(actionDisposable2)
+        }
+        XCTAssertTrue(deallocated1, "deallocated1 != true")
+        XCTAssertFalse(disposed1, "disposed1 != false")
+        XCTAssertTrue(deallocated2, "deallocated2 != true")
+        XCTAssertFalse(disposed2, "disposed2 != false")
+    }
+    
+    func testMetaDisposableAlreadyDisposed() {
+        var deallocated1 = false
+        var disposed1 = false
+        var deallocated2 = false
+        var disposed2 = false
+        if true {
+            var object1: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated1)
+            let actionDisposable1 = ActionDisposable(action: { [object1] () -> Void in
+                object1.debugDescription
+                disposed1 = true
+            })
+            
+            var object2: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated2)
+            let actionDisposable2 = ActionDisposable(action: { [object2] () -> Void in
+                object2.debugDescription
+                disposed2 = true
+            })
+            
+            let metaDisposable = MetaDisposable()
+            metaDisposable.set(actionDisposable1)
+            metaDisposable.dispose()
+            metaDisposable.set(actionDisposable2)
+        }
+        XCTAssertTrue(deallocated1, "deallocated1 != true")
+        XCTAssertTrue(disposed1, "disposed1 != true")
+        XCTAssertTrue(deallocated2, "deallocated2 != true")
+        XCTAssertTrue(disposed2, "disposed2 != true")
+    }
+    
+    func testDisposableSetAlreadyDisposed() {
+        var deallocated1 = false
+        var disposed1 = false
+        var deallocated2 = false
+        var disposed2 = false
+        if true {
+            var object1: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated1)
+            let actionDisposable1 = ActionDisposable(action: { [object1] () -> Void in
+                object1.debugDescription
+                disposed1 = true
+            })
+            
+            var object2: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated2)
+            let actionDisposable2 = ActionDisposable(action: { [object2] () -> Void in
+                object2.debugDescription
+                disposed2 = true
+            })
+            
+            let disposableSet = DisposableSet()
+            disposableSet.add(actionDisposable1)
+            disposableSet.dispose()
+            disposableSet.add(actionDisposable2)
+        }
+        XCTAssertTrue(deallocated1, "deallocated1 != true")
+        XCTAssertTrue(disposed1, "disposed1 != true")
+        XCTAssertTrue(deallocated2, "deallocated2 != true")
+        XCTAssertTrue(disposed2, "disposed2 != true")
+    }
+}

SwiftSignalKitTests/SwiftSignalKitFunctionsTests.swift

@@ -0,0 +1,660 @@
+import UIKit
+import XCTest
+import SwiftSignalKit
+
+func singleSignalInt(value: Signal<Int, Void>) -> Signal<Signal<Int, Void>, Void> {
+    return Signal { subscriber in
+        subscriber.putNext(value)
+        subscriber.putCompletion()
+        return EmptyDisposable
+    }
+}
+
+class SwiftSignalKitFunctionsTests: XCTestCase {
+
+    override func setUp() {
+        super.setUp()
+    }
+    
+    override func tearDown() {
+        super.tearDown()
+    }
+    
+    func testSignalGenerated() {
+        var deallocated = false
+        var disposed = false
+        var generated = false
+        
+        if true {
+            var object: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated)
+            let signal = Signal<Int, Void> { [object] subscriber in
+                subscriber.putNext(1)
+                return ActionDisposable {
+                    object?.description
+                    disposed = true
+                }
+            }
+            
+            let disposable = signal.start(next: { [object] next in
+                generated = true
+                object?.description
+            })
+            
+            object = nil
+            
+            XCTAssertFalse(deallocated, "deallocated != false")
+            
+            disposable.dispose()
+        }
+        
+        XCTAssertTrue(deallocated, "deallocated != true")
+        XCTAssertTrue(disposed, "disposed != true")
+        XCTAssertTrue(generated, "generated != true")
+    }
+    
+    func testSignalGeneratedCompleted() {
+        var deallocated = false
+        var disposed = false
+        var generated = false
+        var completed = false
+        
+        if true {
+            var object: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated)
+            let signal = Signal<Int, Void> { [object] subscriber in
+                subscriber.putNext(1)
+                subscriber.putCompletion()
+                
+                return ActionDisposable {
+                    object?.description
+                    disposed = true
+                }
+            }
+            
+            let disposable = signal.start(next: { [object] next in
+                generated = true
+                object?.description
+            }, completed: { [object]
+                completed = true
+                object?.description
+            })
+            
+            object = nil
+            
+            XCTAssertFalse(deallocated, "deallocated != false")
+            
+            disposable.dispose()
+        }
+        
+        XCTAssertTrue(deallocated, "deallocated != true")
+        XCTAssertTrue(disposed, "disposed != true")
+        XCTAssertTrue(generated, "generated != true")
+        XCTAssertTrue(completed, "completed != true")
+    }
+    
+    func testSignalGeneratedError() {
+        var deallocated = false
+        var disposed = false
+        var generated = false
+        var completed = false
+        var error = false
+        
+        if true {
+            var object: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated)
+            let signal = Signal<Int, Void> { [object] subscriber in
+                subscriber.putError()
+                subscriber.putNext(1)
+                
+                return ActionDisposable {
+                    object?.description
+                    disposed = true
+                }
+            }
+            
+            let disposable = signal.start(next: { [object] next in
+                generated = true
+                object?.description
+            }, error: { [object] _ in
+                error = true
+                object?.description
+            },
+             completed: { [object]
+                completed = true
+                object?.description
+            })
+            
+            object = nil
+            
+            XCTAssertFalse(deallocated, "deallocated != false")
+            
+            disposable.dispose()
+        }
+        
+        XCTAssertTrue(deallocated, "deallocated != true")
+        XCTAssertTrue(disposed, "disposed != true")
+        XCTAssertFalse(generated, "generated != false")
+        XCTAssertFalse(completed, "completed != false")
+        XCTAssertTrue(error, "error != true")
+    }
+    
+    func testMap() {
+        var deallocated = false
+        var disposed = false
+        var generated = false
+        
+        if true {
+            var object: DeallocatingObject? = DeallocatingObject(deallocated: &deallocated)
+            var signal = Signal<Int, Void> { [object] subscriber in
+                subscriber.putNext(1)
+                
+                return ActionDisposable {
+                    object?.description
+                    disposed = true
+                }
+            }
+            signal = signal |> map { $0 * 2}
+            
+            let disposable = signal.start(next: { [object] next in
+                generated = next == 2
+                object?.description
+            })
+            
+            object = nil
+            
+            XCTAssertFalse(deallocated, "deallocated != false")
+            
+            disposable.dispose()
+        }
+        
+        XCTAssertTrue(deallocated, "deallocated != true")
+        XCTAssertTrue(disposed, "disposed != true")
+        XCTAssertTrue(generated, "generated != true")
+    }
+    
+    func testCatch() {
+        let failingSignal = Signal<Int, Int> { subscriber in
+            subscriber.putNext(1)
+            subscriber.putError(1)
+            return EmptyDisposable
+        }
+        
+        let catchSignal = failingSignal |> catch { error in
+            return Signal<Int, Int> { subscriber in
+                subscriber.putNext(error * 2)
+                return EmptyDisposable
+            }
+        }
+        
+        var result = 0
+        catchSignal.start(next: { next in
+            result += next
+        })
+        
+        XCTAssertTrue(result == 3, "result != 2")
+    }
+    
+    func testSubscriberDisposal() {
+        var disposed = false
+        var generated = false
+        var queue = dispatch_queue_create(nil, DISPATCH_QUEUE_SERIAL);
+        
+        if true {
+            let signal = Signal<Int, Void> { subscriber in
+                dispatch_async(queue, {
+                    usleep(200)
+                    subscriber.putNext(1)
+                })
+                return ActionDisposable {
+                    disposed = true
+                }
+            }
+            
+            let disposable = signal.start(next: { next in
+                generated = true
+            })
+            disposable.dispose()
+            
+            dispatch_barrier_sync(queue, {})
+            
+            XCTAssertTrue(disposed, "disposed != true")
+            XCTAssertFalse(generated, "generated != false")
+        }
+    }
+    
+    func testThen() {
+        var generatedFirst = false
+        var disposedFirst = false
+        var generatedSecond = false
+        var disposedSecond = false
+        var result = 0
+        
+        var signal = Signal<Int, Void> { subscriber in
+            generatedFirst = true
+            subscriber.putNext(1)
+            subscriber.putCompletion()
+            return ActionDisposable {
+                disposedFirst = true
+            }
+        }
+        
+        signal = signal |> then (Signal<Int, Void> { subscriber in
+            generatedSecond = true
+            subscriber.putNext(2)
+            subscriber.putCompletion()
+            return ActionDisposable {
+                disposedSecond = true
+            }
+        })
+        
+        signal.start(next: { next in
+            result += next
+        })
+        
+        XCTAssertTrue(generatedFirst, "generatedFirst != true");
+        XCTAssertTrue(disposedFirst, "disposedFirst != true");
+        XCTAssertTrue(generatedSecond, "generatedSecond !+ true");
+        XCTAssertTrue(disposedSecond, "disposedSecond != true");
+        XCTAssertTrue(result == 3, "result != 3");
+    }
+    
+    func testCombineLatest2() {
+        let s1 = Signal<Int, Void> { subscriber in
+            subscriber.putNext(1)
+            subscriber.putCompletion()
+            return EmptyDisposable
+        }
+        let s2 = Signal<Int, Void> { subscriber in
+            subscriber.putNext(2)
+            subscriber.putCompletion()
+            return EmptyDisposable
+        }
+        
+        let signal = combineLatest(s1, s2)
+        
+        var completed = false
+        signal.start(next: { next in
+            XCTAssert(next.0 == 1 && next.1 == 2, "next != (1, 2)")
+            return
+        }, completed: {
+            completed = true
+        })
+        XCTAssert(completed == true, "completed != true")
+    }
+    
+    func testCombineLatest3() {
+        let s1 = Signal<Int, Void> { subscriber in
+            subscriber.putNext(1)
+            subscriber.putCompletion()
+            return EmptyDisposable
+        }
+        let s2 = Signal<Int, Void> { subscriber in
+            subscriber.putNext(2)
+            subscriber.putCompletion()
+            return EmptyDisposable
+        }
+        let s3 = Signal<Int, Void> { subscriber in
+            subscriber.putNext(3)
+            subscriber.putCompletion()
+            return EmptyDisposable
+        }
+        
+        let signal = combineLatest(s1, s2, s3)
+        
+        var completed = false
+        signal.start(next: { next in
+            XCTAssert(next.0 == 1 && next.1 == 2 && next.2 == 3, "next != (1, 2, 3)")
+            return
+        }, completed: {
+                completed = true
+        })
+        XCTAssert(completed == true, "completed != true")
+    }
+    
+    /*func testSingle() {
+        let s1 = Signal<Int, Void>.single(1)
+        let s2 = Signal<Int, Void>.fail(Void())
+        let s3 = Signal<Int, Void>.complete()
+        
+        var singleEmitted = false
+        s1.start(next: { next in
+            singleEmitted = next == 1
+        })
+        XCTAssert(singleEmitted == true, "singleEmitted != true")
+        
+        var errorEmitted = false
+        s2.start(error: { error in
+            errorEmitted = true
+        })
+        XCTAssert(errorEmitted == true, "errorEmitted != true")
+        
+        var completedEmitted = false
+        s3.start(completed: {
+            completedEmitted = true
+        })
+        XCTAssert(completedEmitted == true, "errorEmitted != true")
+    }*/
+    
+    func testSwitchToLatest() {
+        var result: [Int] = []
+        var disposedOne = false
+        var disposedTwo = false
+        var disposedThree = false
+        var completedAll = false
+        
+        var deallocatedOne = false
+        var deallocatedTwo = false
+        var deallocatedThree = false
+        
+        if true {
+            var objectOne: DeallocatingObject? = DeallocatingObject(deallocated: &deallocatedOne)
+            var objectTwo: DeallocatingObject? = DeallocatingObject(deallocated: &deallocatedTwo)
+            var objectThree: DeallocatingObject? = DeallocatingObject(deallocated: &deallocatedThree)
+            
+            let one = Signal<Int, Void> { subscriber in
+                subscriber.putNext(1)
+                subscriber.putCompletion()
+                return ActionDisposable { [objectOne] in
+                    objectOne?.description
+                    disposedOne = true
+                }
+            }
+            
+            let two = Signal<Int, Void> { subscriber in
+                subscriber.putNext(2)
+                subscriber.putCompletion()
+                return ActionDisposable { [objectTwo] in
+                    objectTwo?.description
+                    disposedTwo = true
+                }
+            }
+            
+            let three = Signal<Int, Void> { subscriber in
+                subscriber.putNext(3)
+                subscriber.putCompletion()
+                return ActionDisposable { [objectThree] in
+                    objectThree?.description
+                    disposedThree = true
+                }
+            }
+            
+            let signal = singleSignalInt(one) |> then(singleSignalInt(two)) |> then(singleSignalInt(three)) |> switchToLatest
+            
+            signal.start(next: { next in
+                result.append(next)
+            }, completed: {
+                completedAll = true
+            })
+        }
+        
+        XCTAssert(result.count == 3 && result[0] == 1 && result[1] == 2 && result[2] == 3, "result != [1, 2, 3]");
+        XCTAssert(disposedOne == true, "disposedOne != true");
+        XCTAssert(disposedTwo == true, "disposedTwo != true");
+        XCTAssert(disposedThree == true, "disposedThree != true");
+        XCTAssert(deallocatedOne == true, "deallocatedOne != true");
+        XCTAssert(deallocatedTwo == true, "deallocatedTwo != true");
+        XCTAssert(deallocatedThree == true, "deallocatedThree != true");
+        XCTAssert(completedAll == true, "completedAll != true");
+    }
+    
+    func testSwitchToLatestError() {
+        var errorGenerated = false
+        
+        let one = Signal<Int, Void> { subscriber in
+            subscriber.putError(Void())
+            return EmptyDisposable
+        }
+        
+        let signal = singleSignalInt(one) |> switchToLatest
+        
+        signal.start(error: { error in
+            errorGenerated = true
+        })
+        
+        XCTAssert(errorGenerated == true, "errorGenerated != true")
+    }
+    
+    func testQueue() {
+        let q = dispatch_queue_create(nil, DISPATCH_QUEUE_SERIAL)
+        
+        var disposedOne = false
+        var disposedTwo = false
+        var disposedThree = false
+        var completedAll = false
+        var result: [Int] = []
+        
+        let one = Signal<Int, Void> { subscriber in
+            dispatch_async(q, {
+                subscriber.putNext(1)
+                subscriber.putCompletion()
+            })
+            return ActionDisposable {
+                disposedOne = true
+            }
+        }
+        
+        let two = Signal<Int, Void> { subscriber in
+            dispatch_async(q, {
+                subscriber.putNext(2)
+                subscriber.putCompletion()
+            })
+            return ActionDisposable {
+                disposedTwo = true
+            }
+        }
+        
+        let three = Signal<Int, Void> { subscriber in
+            dispatch_async(q, {
+                subscriber.putNext(3)
+                subscriber.putCompletion()
+            })
+            return ActionDisposable {
+                disposedThree = true
+            }
+        }
+        
+        let signal = singleSignalInt(one) |> then(singleSignalInt(two)) |> then(singleSignalInt(three)) |> queue
+        
+        signal.start(next: { next in
+            println("next: \(next)")
+            result.append(next)
+        }, completed: {
+            completedAll = true
+        })
+        
+        usleep(1000 * 200)
+        
+        XCTAssert(result.count == 3 && result[0] == 1 && result[1] == 2 && result[2] == 3, "result != [1, 2, 3]");
+        XCTAssert(disposedOne == true, "disposedOne != true");
+        XCTAssert(disposedTwo == true, "disposedTwo != true");
+        XCTAssert(disposedThree == true, "disposedThree != true");
+        XCTAssert(completedAll == true, "completedAll != true");
+    }
+    
+    func testQueueInterrupted() {
+        let q = dispatch_queue_create(nil, DISPATCH_QUEUE_SERIAL)
+        
+        var disposedOne = false
+        var disposedTwo = false
+        var disposedThree = false
+        var startedThird = false
+        var completedAll = false
+        var result: [Int] = []
+        
+        let one = Signal<Int, Void> { subscriber in
+            dispatch_async(q, {
+                subscriber.putNext(1)
+                subscriber.putCompletion()
+            })
+            return ActionDisposable {
+                disposedOne = true
+            }
+        }
+        
+        let two = Signal<Int, Void> { subscriber in
+            dispatch_async(q, {
+                subscriber.putNext(2)
+                subscriber.putError(Void())
+            })
+            return ActionDisposable {
+                disposedTwo = true
+            }
+        }
+        
+        let three = Signal<Int, Void> { subscriber in
+            startedThird = true
+            dispatch_async(q, {
+                subscriber.putNext(3)
+                subscriber.putCompletion()
+            })
+            return ActionDisposable {
+                disposedThree = true
+            }
+        }
+        
+        let signal = singleSignalInt(one) |> then(singleSignalInt(two)) |> then(singleSignalInt(three)) |> queue
+        
+        signal.start(next: { next in
+            result.append(next)
+        }, completed: {
+            completedAll = true
+        })
+        
+        usleep(1000 * 200)
+        
+        XCTAssert(result.count == 2 && result[0] == 1 && result[1] == 2, "result != [1, 2]");
+        XCTAssert(disposedOne == true, "disposedOne != true");
+        XCTAssert(disposedTwo == true, "disposedTwo != true");
+        XCTAssert(disposedThree == false, "disposedThree != false");
+        XCTAssert(startedThird == false, "startedThird != false");
+        XCTAssert(completedAll == false, "completedAll != false");
+    }
+    
+    func testQueueDisposed() {
+        let q = dispatch_queue_create(nil, DISPATCH_QUEUE_SERIAL)
+        
+        var disposedOne = false
+        var disposedTwo = false
+        var disposedThree = false
+        var startedFirst = false
+        var startedSecond = false
+        var startedThird = false
+        var result: [Int] = []
+        
+        let one = Signal<Int, Void> { subscriber in
+            startedFirst = true
+            var cancelled = false
+            dispatch_async(q, {
+                if !cancelled {
+                    usleep(100 * 1000)
+                    subscriber.putNext(1)
+                    subscriber.putCompletion()
+                }
+            })
+            return ActionDisposable {
+                cancelled = true
+                disposedOne = true
+            }
+        }
+        
+        let two = Signal<Int, Void> { subscriber in
+            startedSecond = true
+            var cancelled = false
+            dispatch_async(q, {
+                if !cancelled {
+                    usleep(100 * 1000)
+                    subscriber.putNext(2)
+                    subscriber.putError(Void())
+                }
+            })
+            return ActionDisposable {
+                cancelled = true
+                disposedTwo = true
+            }
+        }
+        
+        let three = Signal<Int, Void> { subscriber in
+            startedThird = true
+            var cancelled = false
+            dispatch_async(q, {
+                if !cancelled {
+                    usleep(100 * 1000)
+                    subscriber.putNext(3)
+                    subscriber.putCompletion()
+                }
+            })
+            return ActionDisposable {
+                cancelled = true
+                disposedThree = true
+            }
+        }
+        
+        let signal = singleSignalInt(one) |> then(singleSignalInt(two)) |> then(singleSignalInt(three)) |> queue
+        
+        signal.start(next: { next in
+            result.append(next)
+        }).dispose()
+        
+        usleep(1000 * 200)
+        
+        XCTAssert(result.count == 0, "result != []");
+        XCTAssert(disposedOne == true, "disposedOne != true");
+        XCTAssert(disposedTwo == false, "disposedTwo != false");
+        XCTAssert(disposedThree == false, "disposedThree != false");
+        XCTAssert(startedFirst == true, "startedFirst != false");
+        XCTAssert(startedSecond == false, "startedSecond != false");
+        XCTAssert(startedThird == false, "startedThird != false");
+    }
+    
+    func testRestart() {
+        let q = dispatch_queue_create(nil, DISPATCH_QUEUE_CONCURRENT)
+        let signal = Signal<Int, Void> { subscriber in
+            dispatch_async(q, {
+                subscriber.putNext(1)
+                subscriber.putCompletion()
+            })
+            return EmptyDisposable
+        }
+        
+        var result = 0
+        
+        (signal |> restart |> take(3)).start(next: { next in
+            result += next
+        })
+        
+        usleep(100 * 1000)
+        
+        XCTAssert(result == 3, "result != 3")
+    }
+    
+    func testPipe() {
+        let pipe = Pipe<Int>()
+        
+        var result1 = 0
+        let disposable1 = pipe.signal().start(next: { next in
+            result1 += next
+        })
+        
+        var result2 = 0
+        let disposable2 = pipe.signal().start(next: { next in
+            result2 += next
+        })
+        
+        pipe.putNext(1)
+        
+        XCTAssert(result1 == 1, "result1 != 1")
+        XCTAssert(result2 == 1, "result2 != 1")
+        
+        disposable1.dispose()
+        
+        pipe.putNext(1)
+        
+        XCTAssert(result1 == 1, "result1 != 1")
+        XCTAssert(result2 == 2, "result2 != 2")
+        
+        disposable2.dispose()
+        
+        pipe.putNext(1)
+        
+        XCTAssert(result1 == 1, "result1 != 1")
+        XCTAssert(result2 == 2, "result2 != 2")
+    }
+}